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Arduino

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Arduino de C.Doutriaux, J.-C.Quetin
          

Las mejores ofertas en cursos del Black Friday 2019

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Las mejores ofertas en cursos del Black Friday 2019

Black Friday 2019 ya está aquí y con él famoso día llega una avalancha total de ofertas no solo el mismo viernes, sino el los días previos y posteriores. En Genbeta hemos estado recogiendo algunas de las oportunidades más interesantes relacionadas con software y servicios y ahora haremos lo propio con cursos online en español sobre computación, programación, hacking y ciberseguridad.

Si bien hay mucho que se puede aprender online gratis, algunas ofertas educativas más completas, con certificación y demás beneficios suelen ser de pago. Pero las plataformas de educación en linea no pierden la oportunidad durante estos últimos días de noviembre y principios de diciembre para también unirse con sus propias promociones.

Cursos a 9.99 euros en Udemy

Adi Goldstein Mdinbvq1sfg Unsplash

Cursos a 9.90 en Domestika

Kelly Sikkema Yk0hpwwdj1i Unsplash

Cursos con 70% de descuento en Tutellus

Kobu Agency 67l18r4tw W Unsplash

Utiliza el cupón BLACKFRIDAY antes de inscribirte para ahorrar hasta un 70%.

Descuentos de 25% en los cursos online de Securizame

Fabian Grohs Dc6pb2jdaqs Unsplash

Apple Coding Academy

Hasta el 5 de diciembre puedes obtener un 30% de descuento en los cursos de Swift 5.1 y Desarrollo de apps con SwiftUI. Si combinas las ofertas y tomas los dos cursos puedes obtener 35% de descuento. Los cursos de Apple Coding en Udemy tienen un descuento del 52%.

Más ofertas

  • 3 meses de Amazon Kindle Unlimited por 29,97 euros gratis.
  • 4 meses de Amazon Music Unlimited por 0,99 euros.
  • 30 días de Amazon Prime gratis.

Puedes estar al día y en cada momento informado de las principales ofertas y novedades de Xataka Selección en nuestro canal de Telegram o en nuestros perfiles de Twitter , Facebook y la revista Flipboard. Puedes echar un vistazo también a los cazando gangas de Xataka Móvil, Xataka Android, Xataka Foto, Vida Extra, Espinof y Applesfera, así como con nuestros compañeros de Compradicción. Puedes ver todas las gangas que publican en Twitter y Facebook, e incluso suscribirte a sus avisos vía Telegram.

También puedes encontrar aquí las mejores ofertas del Black Friday 2019.

Xataka Selección
ofrece:
Descubre las mejores ofertas en Tecnología del Black Friday que hemos seleccionado para ti en Xataka Selección. ¡No te las pierdas!

Nota: algunos de los enlaces aquí publicados son de afiliados. A pesar de ello, ninguno de los cursos mencionados han sido propuestos por las webs, siendo su introducción una decisión única del equipo de editores.

También te recomendamos

Gracias a esta web puedes verificar si una oferta de Black Friday de verdad vale la pena antes de comprar

Las mejores ofertas en software del Black Friday 2019

Las mejores ofertas en software, VPN y cursos en la semana previa al Black Friday 2019

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La noticia Las mejores ofertas en cursos del Black Friday 2019 fue publicada originalmente en Genbeta por Gabriela González .


          

Estudiantes de la UNCP, desarrollan proyecto que busca potenciar y automatizar la agricultura

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Son del segundo semestre del Programa de Estudios Generales (PEG)

 Estudiantes del segundo semestre de la Facultad de Ingeniería de Sistemas del Programa de Estudios Generales (PEG) de la Universidad Nacional del Centro del Perú (UNCP), desarrollan un novedoso proyecto tecnológico, denominado: “Sembrando Tecnología con Earth Bot”, que busca potenciar y automatizar la actividad de la siembra en las zonas rurales.

Earth Bot, es un prototipo de robot compuesto por Arduino, una plataforma de creación de electrónica de código abierto, que contempla un hardware y software libre, que permite crear diferentes tipos de microordenadores.

En tanto, el sistema robótico se apoya en una plataforma móvil, a través del Bluetooth que envía órdenes para su desplazamiento. El prototipo cuenta con cinco motores que permitiría la siembra de aproximadamente 100m2 en una hora.

“Con nuestro proyecto, queremos disminuir la brecha de desigualdad tecnológica que existe en las zonas rurales por la falta de servicios de electricidad, internet y señal telefónica y buscamos que los escolares como miembros transformadores de su realidad, despierten el interés en el campo tecnológico con su creatividad e innovación para el desarrollo de sus comunidades”, sostuvo Estefany Fabián Sinti, integrante del proyecto.

DATOS:

 A través de este proyecto, se capacita a 13 estudiantes de la I.E. Almirante Miguel Grau del centro poblado de Ullusca del distrito de Parco-Jauja y 38 estudiantes de la I.E. Inca Garcilazo de la Vega del distrito de Acolla-Jauja, con principios básicos de diseño, programación e implementación de sistema robótico.

 La capacitación hecha a escolares del cuarto año de secundaria permitirá que estos tengan conocimientos básicos de electrónica, programación, control, mecánica y así poder diseñar su prototipo de robot.

          

Meet Aster, the 3D-printed humanoid robot

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If you’d like to build your own vaguely humanoid robot, but don’t care about it getting around, then look no further than Aster.  The 3D-printed bot is controlled by an Arduino Uno, with a servo shield to actuate its 16 servo motors. This enables it to move its arms quite dramatically as seen in the […]
          

Make music with the help of an Arduino-powered hole puncher

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Maker ‘pashiran’ purchased a music box which could be programmed with punch cards, but soon found that actually creating tunes this way by hand was exhausting. His solution was to automate the process, designing a fixture to punch the cards for him! His new auto-programmer acts as a simple CNC machine, using stepper motors to […]
          

Awesome dad builds an Arduino-powered button box for his toddler son

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Like most one-year-olds, CodeParade’s son really likes pushing buttons. Rather than purchasing a so-called busy board that might teach him skills like unlocking doors or plugging in electrical outlets, he decided to build his own custom device controlled by an Arduino Uno. The resulting toy features a wide variety of lights, buttons and switches, and […]
          

This YouTuber recreated the D-O droid from Star Wars: Episode 9 with Arduino

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While it’s yet to make its premiere, Matt Denton has already built the D-O droid from Star Wars: The Rise of Skywalker using a MKR WiFi 1010 for control, along with a MKR IMU Shield and a MKR Motor Carrier.  The droid scoots around on what appears to be one large wheel, which conceals the […]
          

The Science Kit is now available in Italian and Spanish

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Launched back in January 2019 in partnership with Google, the Arduino Science Kit Physics Lab is designed for middle school students (aged 11 to 14) to explore science. It is now available with Italian and Spanish course content, making it more accessible than ever. “You discovered it yourself, so it was really fun doing that.” – […]
          

CO2 Stripper Postmortem Thoughts

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Published on November 30, 2019 9:20 PM UTC

[EDIT: A crucial consideration was pointed out in the comments. For all the designs I've looked at, it's cheaper to just get a heat exchanger and ventilation fans, and blow the air outside/pull it inside and eat the extra heating costs/throw on an extra layer of clothing, than it is to buy a CO2 stripper. There's still an application niche for poorly ventilated rooms without windows, but that describes a lot fewer occasions than my previous dreams of commercial use.]


So, I have finally completed building a CO2 stripper that removes CO2 from the air to (hopefully) improve cognition in environments with high CO2 levels. In California, the weather is pretty good so it's easy to just crack a window at any point during the year, but other areas get quite cold during the winter or quite warm during summer and it's infeasible to open a window unless you want to spend an awful lot of money on heating or cooling bills. It didn't work quite as well as the math indicated at first, but the whole thing is built, and basically functional. The rest of this post will be a reflection on the lessons learned while doing so.


1: In hardware, ideas are cheap, execution is expensive

So, the fundamental idea is extremely simple once you have some basic knowledge of chemistry. The goal is to get CO2 into some form that isn't the gas form, via some sort of chemical reaction.

Submarines and CO2 capture from flue gas use a reversible reaction with ethanolamines, where they absorb CO2 at high temperatures and release it at low temperatures. Reversible reactions are good for making waste, but heating up and cooling down large quantities of liquid takes an awful lot of energy. Submarines have nuclear reactors onboard, and flue gas is hot, but we don't necessarily have the energy required. Also ethanolamines are toxic and hard to get a hold of for a civilian and really stinky, being the major component of "submarine smell".

Adsorption onto zeolites is also plausible, but the issue is that it requires alternately exposing the zeolites to high air pressure and low air pressure, and high airflow is required. The combination of high pressure and high airflow means that again, you're using a lot of energy. The basic math is as follows: One human produces about 1 kg of CO2 in 24 hours. We can idealize a perfect CO2 stripper as a magic box that inhales air and spits it out at 0 ppm. If you want a steady-state concentration of 500 ppm for 2 people, then we can see how much air-flow is required to lock up 2 kg of CO2 in 24 hours. This comes out to about 100 cubic feet per minute. This is the bare minimum air flow for any CO2 stripper, but in this particular case, it corresponds to a 25 horsepower air compressor, which is 18 kilowatts. This is equivalent to running 5 electric dryers at once. So that one is out too, especially since we were assuming 100% efficiency at eliminating CO2.

What about irreversible reactions? Just lock the CO2 up as a solid waste? Well, to begin with, this is going to produce quite a waste stream, and consume quite a bit of chemicals, you'd better hope it's safe and that the feed chemical is cheap. The reaction used on space missions used lithium hydroxide. The basic idea is that lithium hydroxide makes a very basic solution. Carbon dioxide is slightly acidic, so it dissolves very fast into basic solutions. Then you get precipitation of lithium carbonate which is safe.

The problem is that lithium hydroxide is quite expensive. It was used on space missions because it's the most mass-efficient way of doing that sort of reaction and every gram counts in space missions, but we want the cheapest way of doing that reaction.

And then we hit upon the perfect solution. Calcium hydroxide. It's an extremely cheap bulk chemical, 15 bucks for a 50-pound sack of it at a hardware store. It's fairly mild as far as hydroxides go, being pH 12.4. So instead of giving you horrible chemical burns, it's safe to handle unless you're exposed to it for over an hour at a time without washing it off. It's the alkaline analogue of the difference between 1 M hydrochloric acid, and lemon juice. And when it reacts with CO2, it makes CaCO3, aka limestone, which is totally harmless. In fact, it's a common laboratory demonstration that breathing onto a solution of this stuff produces a white film/crust on the top, which is the CO2 in the breath locked up as solid limestone. It's the obvious choice if you're trying to remove CO2 via chemical means.

And in fact, in the SSC comment section, someone else independently had the exact same idea! Just lock up CO2 with calcium hydroxide!

The simplicity of an idea in the field of atoms instead of bits doesn't necessarily mean that anyone on earth has ever done it before, though, or will ever do it, and I'm not worried about anyone scooping the idea, because building novel hardware is hard enough to provide a natural barrier to entry unless it's a large company that's interested in the idea. Ideas are cheap, execution is expensive, in both time and money.

2: Only polymaths need apply

If you're trying to build a novel machine in your garage, and aren't working as part of an engineering team, you will either need an improbably wide range of knowledge, or the general ability to pick up whatever you need to learn. There's the basic knowledge of chemistry to spot that this is the obvious reaction to go for, but the full design requires:

Familiarity with wastewater aerators to know what to buy to prevent clogging with solids, knowledge on which materials won't react with your chemicals, the math of air flow in pipes, the ability to read fan pressure/airflow curves, the ability to go from "I want a circuit that does this" to building a novel electronic circuit on a breadboard without frying anything important, enough programming knowledge to write some basic arduino code, familiarity with hazardous waste disposal regulations in your state, familiarity with waste dewatering techniques, familiarity with which sort of pumps can pump sludge instead of pure water, some electrical engineering knowledge to work safely with 220V power without frying yourself or anyone else, knowledge of soundproofing, and especially the familiarity with everything at Home Depot that lets you home in on the most efficient and foolproof way of building a thing that does what you want. Probably some other stuff too that I consider obvious but others might not.

Now, most of this is pretty easy to pick up given enough starting mental firepower, and the sense of what to google for. Or just having lots of experience with building material things.

Having one of the relevant fields of knowledge manifests itself as knowing ahead of time which approaches will work and which will fail and what solutions past work in the area has already found.

For some of these, missing it will manifest as not knowing that there's an incoming bullet in a particular area, like not knowing that fine bubble aerators will promptly clog if there's lots of particulates in the water, or not suspecting that high air flow rates are incompatible with small pipe (I knew the latter one and it still almost got me until I idly decided to work out airflow velocity in the pipe and realized it was around 200 mph)

3: The planning fallacy is huge here.

So, it wound up costing a lot more than I thought and taking a lot longer than I thought. The mechanism of why the planning fallacy hits so hard here is tied in with the design process. What happens is that you start out with a sketchy outline of all the component parts (like, "I need something that automatically dispenses chemical powder"), and as it becomes time to build a part, you drill down further and further in fleshing out the details until eventually you've drilled down far enough for your design to Actually Work in reality. While you do this, you will inevitably come across parts that are a lot harder to do than you expected, which you were glossing over on the first pass. The shiny black box of "build a chemical dispenser" looks more tractable than "how the fuck do I build a motor mounting plate with my inadequate tools", which you didn't initially suspect you had to do because you weren't thinking at that level of detail. And also as you address the parts that are easy to do, all that is left is the parts that are hard or annoying or time-consuming to do, which can be somewhat demoralizing.

Same sort of thing goes with cost. You start out with "so here's the cost for the big parts and everything else that's left shouldn't cost that much" (black-box warning on "everything else"!), and then you go to Home Depot and pick up a bunch of 4-inch ABS pipe and black glue and all the 90 degree and T pieces you need for the aeration pipes and look at the cost and it's 100 bucks. Home Depot trips add up shockingly fast. There's also all the stuff you buy that you don't eventually end up using because the design evolves as you actually try to build it, like buying gears when you don't actually need gears, and all the stuff you didn't think you had to buy but it turns out that you do need it.

And sometimes you just get hit with some problem you didn't expect at all and now have to fix, like "my fan is making a screaming noise, what do"

4. Why is there a valley of death?

Universities and the government funds basic research. Then there's the private sector of business. The gap between the two, where you have to go from basic research to a business selling the new exciting thing is called the "valley of death". Now, you'd think this is what R&D is for. But a lot of R&D from a business seems to be focused on marginal improvements to existing things that already fall under the scope of what the existing business does, and not so much on building a novel thing that can be the seed of a new business. Building a novel thing requires a wide knowledge base, as discussed before, and inevitably takes a lot more money and time than expected. It's the sort of thing done by inventors in a garage as a project of love, not the sort of thing you get paid to do.

Further, crossing the valley of death requires both the technical capacity to build the thing, and the business skills to make a new business from scratch. If you have several people with different skills joined together, it can be bridged, but one flaw of doing it alone is that there are a lot more inventors with the ability to build the thing, than inventors with the ability to build the thing and also the ability or willingness to start a business that sells the thing. I'm in the former category. I can build it, but I hate building it and if I have to build all the machines myself to sell, I'd flatly reject it, and I really don't want to be responsible for running a business selling it, I'd have no idea how to run a business, and it'd eat too much time. My dream is to get a design good enough to sell, patent it, find someone willing to make a business out of it, and just receive a cut of profits without having to be involved in anything more regarding the production or selling of the machines, besides helping out with technical design work. Further, someone with just the business skills won't necessarily have the technical ability to come up with the machine in the first place, let alone build it. And there's also the lemon market problem of businesspeople identifying competent non-scam technical people with a viable design, and technical people finding competent non-scam businesspeople.

There are further issues such as designing the new invention such that it is robust and keeps working for a while (not a property that prototypes generally have), and designing it such that it is easy to build and maintain (also not usually a property associated with garage prototypes).

I've heard that there's a company in the UK that takes garage prototypes and updates the design for robustness, easy constructibility, and cost, which seems like an important part of closing the valley.

5. Building alone vs building as part of a team.

In a certain sense, I was blessed on this project, because I had complete control over the entire design. I had to contend with no meetings, and no unexpected changes to parts of the design that were already locked in, and no team decisions that were dumb and couldn't possibly work. It's the dream for anyone who dislikes group projects in engineering. All failures are attributable to me alone, as well as all successes. Then again, having someone else to work on the project with me definitely would have sped it up and I could rely on their knowledge of things I was ignorant of, relaxing the polymath requirement. Maybe there's an optimal design team size? I guess it'd depend on how parallelizable the work is, as well as how decision-making-quality scales with group size.

6. Final diagnosis and where to go from here.

So, it was over-time and over-budget and didn't work as well as I had hoped, but it does indeed work. Planning fallacy is a huge obstacle here, and I now certainly see why there's a valley of death for this sort of work.

In order to make a version that's practical for domestic use, I'd have to redo the design to be a rain-column design, primarily because it only requires high airflow, instead of the combination of high airflow and high pressure, which requires buying an expensive fan from China and the expensive electronic components which provide the appropriate power to operate the fan. A rain column design could use a much cheaper and simpler fan that operates from a wall outlet.

Further, in order for others interested in CO2 reduction to have one of their own, I'd have to team up with someone who could make a small business in assembling and selling these things, preferably involving someone who is not me building the relevant thing. PM me if interested.







Discuss
          

Price Drop: Electronics Circuit Calculator (Utilities)

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Electronics Circuit Calculator 2.5.8


Device: iOS Universal
Category: Utilities
Price: $2.99 -> Free, Version: 2.5.8 (iTunes)

Description:

Enjoy more than 20 different calculations and conversions from a SINGLE APP!

Electronics Circuit Calculator is an app designed to solve the day-to-day circuit problems for engineers with much greater convenience and efficiency than manual and digital board calculators. This smartphone app integrates the power of value calculation of different variables in a circuit. No more chalking out the results of different breadboards or conducting complex calculations to find values of different circuit components as this app will automatically perform it all for you. Electronics Circuit Calculator features Logic Gate calculations, variable calculations, a power FM radio and a Binary to Decimal or Decimal to Binary converter.

For students, engineer, hobbyists, or career professionals in computer engineering, Electronics Circuit Calculator is one of the handiest apps to download. The app saves time and effort by letting you calculate the variable values instantly. The app keeps the preview of calculations for a stable duration of 20 seconds so that you can track your work and rectify any logic mistakes in the execution of circuit values.

Electronics Circuit Calculator is an app which provides values for circuit variables and applications of different circuit components like resistors and capacitors with utmost precision and accuracy. The app is very easy to use and anyone with a basic knowledge of electronic circuits can use it.

Download Electronics Circuit Calculator and launch the app once the download is complete. Pick from a range of calculators, convertors and FM transmitter to conduct any circuit calculation of your choice.

This app is specifically designed to solve more than 20 different variable calculations and conversions.
Use it for solving:
· Logic Gates on Breadboards (including AND, OR, NAND and NOR, Hex Inverter NOT gates)
· Value of Adjustable and constant 5V Voltage calculators on the breadboard
· Value of RC Low Pass filter embedded on a breadboard
· Calculation of wavelength, RF power ratio and Power density
· Calculation of Skin Depth and Capacitor charging, Impedence and Timing constant
· Calculation of Power Added Efficiency, Noise Figure and Noise temperature
· Calculation of Free Space Path Loss and Link Budget
· Calculation of T-Pad Attenuator and Stepper Motor
· VSWR Return Loss and RMS Voltage calculations

And that’s not all! Electronics Circuit Calculator is an all-encompassing color code calculator, a radio transmitter and a converter which offers a myriad of additional useful features such as:
· LC of Tank circuit and Ohm’s Law Calculation
· Determining the value of resistor and inductor using color code
· Power, 555 timer output frequency and 741 op-amp inverting calculations

Do these features seem to be useful for you? So, what are you waiting for? Click on the download button and step on a journey of becoming a pro electronic circuit engineer today!

What's New

-General Improvements.
-Tap on Any image to view it and zoom in and out.(Arduino , Breadboard)
-Basic Arduino Uno Guide.(Free Pass).

Electronics Circuit Calculator


          

Wall drawing robots

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Drawbot Overview: www.marginallyclever.com/2012/02/drawbot-overview This is the “grandfather” of all these wall drawing robots: http://juerglehni.com/works/hektor/ The ChalkBot also is a good source of information: https://blog.hipolabs.com/chalkbot-77a312921dd0 Giant Drawing Machine: https://essay.utwente.nl/73003/1/te_voortwis_janwillem_BA_EEMCS.pdf Make Arduino XY Plotter Drawing Robot Polargraph: https://www.hackster.io/mertarduino/make-arduino-xy-plotter-drawing-robot-polargraph-b4fe36 How to make an OpenSource Vertical Plotter: https://www.open-electronics.org/how-to-make-an-opensource-vertical-plotter/ Der Kritzler: https://tinkerlog.com/2011/09/02/der-kritzler/
          

Arduino Visual Studio

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Visual Micro je aadin pre Visual Studio, ktorý ho využíva ako IDE.


          

New Arduino Tutorial Kit

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New Arduino Tutorial Kit
          

Teensy Usb Keyboard does not work in BIOS

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Hardware: Teensy 3.2 I have this minimal sketch based on the example found in Arduino->Example->Teensy, where Teensyduino is installed. I have not...
          

Electrónica Main

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¿Por qué te decidiste a iniciar el blog? Decidí abrirlo porque me gusta dar a conocer y ofrecer mis conocimientos en mis áreas de electrónica digital, análoga y programación arduino, en diferentes niveles de conocimientos, donde la meta propuesta es que los usuarios obtengan más información y se animen a culminar sus metas propuestas, a…
          

Omni Direction Mecanum Wheel Robotic Kit(Arduino Mega2560) Lesson 5: Wifi IoT control

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Buy from US Buy from UK Buy from DE Buy from IT Buy from FR Buy from ES Buy from JP In this project we will connect Robot Car to Wifi and Use an APP to control the car through Internet. This is a typical Internet of Things(IoT) Application. OSOYOO Mecanum Wheels Robotic Car Chassis ...Read the Rest
          

Omni Direction Mecanum Wheel Robotic Kit(Arduino Mega2560) Lesson 4: Bluetooth imitation robot car

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Buy from US Buy from UK Buy from DE Buy from IT Buy from FR Buy from ES Buy from JP In this lesson, we will use Mobile to control our robot car and make an imitation driving. Since is a mock driving, we will use a virtual steering wheel and gear in our APP ...Read the Rest
          

Mecanum Omni Direction Wheel Robotic Kit(Arduino Mega2560) Lesson 3: Tracking Line

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Buy from US Buy from UK Buy from DE Buy from IT Buy from FR Buy from ES Buy from JP In this lesson3, we will add a 3-Point tracking sensor module to the robotic car built in Lesson 1.The software in this lesson will read data from the 3-Point Tracking sensor module and automatically ...Read the Rest
          

Omni Direction Mecanum Wheel Robotic Kit(Arduino Mega2560) Lesson 2: Obstacle avoidance robot car

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Buy from US Buy from UK Buy from DE Buy from IT Buy from FR Buy from ES Buy from JP In this lesson, you must complete lesson 1 before you continue on with this lesson. we use the ultrasonic module to “see” obstacle and measure the distance. If the distance is less than pre-defined threshold ...Read the Rest
          

【3D列印】製作gigo(智高)積木的基本元件

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積木的一大特點就是可以堆疊,但最重要的條件就是規格相符。早先因為某些需要,將智高積木的底板連結加大,但畢竟這種應用只牽涉少數幾顆的接合,狀況較為單純。最近則是因為想做一個便條紙的收納盒,而需要有較大面積的積木接合,因此「規格」就變得非常重要了。

b2

此外,原本因為顆數少,在建模軟體(我用 123D design)上操作時,尚稱容易,但是當顆數變多時,原本的做法就沒效率。對此,我也發展出一個比較快的做法與大家分享,希望大家節省一些時間。

所以這篇主要解決二個問題:

1.規格
2.效率

我稱積本的每一個凹或凸為一個「單元」。因為是積木,它的每一個單元理應完全相等。從「Arduino 積木應用與專題製作」(賴鴻洲編著,台科大圖書出版) 讀到「每一個圓孔直徑8mm」,以此為標準試做凹凸部位。據此,凸點應該比8mm稍小,凹孔則應該比 8mm 稍大。

個人文件_96

另外還要考慮的就是單元與單元間的距離。底下直接講結論:

單元的間距是 10.12 mm;凹點直徑 8.16mm(半徑 4.08mm);凸點直徑 7.88mm(半徑 3.94mm)。

(這是建議值,因為依據3D印表機的各種條件、線材特性、期待的咬合鬆緊…等,都需要微調)

因此,我在 123D 上做一個「凸點單元」的做法是:

  1. 建立一個 10.12 x 10.12 x 3 mm 的平板,稱為 A。
  2. 建立一個 半徑 3.94 mm,高 8mm 的圓柱,稱為 B。
  3. 將 A, B 「對齊」後「合併」為一個物件供後續使用。

同理「凹孔單元」,即是將圓柱改為半徑 4.08mm,「對齊」後「相減」。

Image 089 

再用「磁鐵」功能將二者吸附在一起,非常方便且準確。

Image 091

接著就是使用「路徑陣列」很快就能做出多個相同物件,然後再一一用「磁鐵」相吸。

Image 093

很快就能組合出想要的平面。

Image 094

這樣就能貼合到任何想要的情境了。

Image 095

P_20191127_074126誠如前述,因為依據3D印表機的各種條件、線材特性、期待的咬合鬆緊…等,間隙需要微調,由圖中可看出有三小塊的橘色積木貼合在四周,這是因為間隙較大,怕長期拿取memo紙造成盒子脫落,所以特別「加強」了一下,經此貼合,它們就非常牢固了。

P_20191127_073804


          

How to Use Adafruit Touch LCDs With NXP LPC55S69-EVK

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Learn how NXP LPC55S69-EVK boards can be used with Adafruit TFT LCD boards.

The NXP LPC55S69-EVK is a versatile board. In this article, we demonstrate how it can be used with Adafruit TFT LCD boards, both with resistive and capacitive touch. For the software, I’m using the open-source LittlevGL GUI.

LPC55S69-EVK with Adafruit Touch LCD

Software and Hardware Used

Installed SDK


          

RE: doska s fpga & sram problem

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Je arduino platforma schopna citat a ovladat to co popisujem v dnesnom komente Alojzovi ?


          

RE: doska s fpga & sram problem

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To je doska z minulého tisícročia. On by potreboval niekoho s klieštikmi a programátorom na SRAM. V minulom tisícročí sa tak oživovali napríklad BIOSy.

Problém je že v posledných päťročniciach boli takéto hry s programovaním čipov vytlačené projektom Arduino, a málokto má doma nacvakávačky na čip.


          

This guy hand-makes and sells giant LEDs

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You can buy a giant LED from a guy who makes them at home. The cost about $70.

From his site:

My first Maker Faire as a maker was New York 2012, I brought a Giant Arduino Starter Kit (YouTube video Giant Arduino Starter Kit - A 10x Scale Model). Everything was ten times scaled up; the Arduino Uno, breadboard, resistors, potentiometer, LDR, jumper wires, and LEDs.

As the LEDs were portable, I would bring an LED with me to other Faire's, it has always been received well and many times people would ask was it for sale.

In September 2018 I decided to explore turning the rough model in to something that I would be happy to sell. The following YouTube playlist records some of the progress in Making a Refined Giant LED.

[via Evil Mad Scientist] Read the rest


          

Круглый дисплей для микроконтроллера

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Цена: 8.99 $Перейти в магазин

Как только на рынке появились смарт-часы с круглым дисплеем, у меня сразу же появилось непреодолимое желание получить такой дисплей и использовать с ардуино. Конечно, с практической точки зрения такой дисплей подходит лишь для узкого круга задач в отличие от дисплеев прямоугольной формы, однако, как говорится охота пуще неволи.

Читать далее
          

37 students accepted to CS Research mentorship program

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Computer science research addresses problems that affect all of our lives, from producing better flood forecasts to live captions and more. To ensure that CS research explores the issues that affect all communities, the researchers themselves need to be representative of those communities But in 2018, less than 25 percent of computer science PhD degrees in the United States were awarded to researchers from groups historically underrepresented in technology.

As part of our efforts to broaden participation in CS research careers and make them more accessible to everyone, we accepted 37 outstanding undergraduates to Google’s CS Research Mentorship Program (CSRMP) this fall. The program encourages students to pursue graduate and doctorate-level CS studies by matching them with Google mentors. As the students work toward their goals, they attend a CS research conference and travel to Mountain View as guests for the PhD Fellowship Summit.

We caught up with Sam Steinberg, a junior in Information Science at Cornell University, to learn about her journey to the program and what she wants to accomplish with CS research. 

Sam Steinberg

Sam Steinberg was accepted into Google’s CS Research Mentorship Program this year

What led you to CS?

At six years old, I walked into my room and threw the family laptop onto the ceramic floor. I wanted to  see its insides, and there they were: circuits, capacitors, resistors and motors scattered like cookie crumbs across the ground. While my parents were certainly upset about the mess I made (sorry mom and dad!), I was in awe, and that’s how my love affair with technology began.

What were some defining moments in your CS journey?

In high school, I was the only girl in my CS classes. After a Girls Who Code summer program, I started a club at my school. I found that so much of learning difficulty doesn’t have to do with the content, but the environment in which you absorb material. In the Girls Who Code club, I felt undaunted to ask questions, work alongside my peers, and help teach other girls. 

One of the most humbling moments was being named the inaugural winner of The Society of Women Engineers SWENext Award. As a young Latina aspiring to work in tech, it was eye-opening to learn about the discrepancies in retention for minorities in STEM. SWE has helped further instill my passion for advocating about the importance of gender and ethinic diversity in STEM fields.

Why are you interested in CS research?

I'm a 5 foot 2 Puerto Rican Jew with a lisp, and the career aspirations of Shuri, the female engineer from Black Panther. Like any Marvel hero, I want to change the world, but not by shooting laser beams to defeat the bad guys. I’ve always been fascinated with how technology can be used as a tool to help others, especially how those with cognitive and learning disabilities can maintain focus and relaxation in school and daily life.

What do you hope to accomplish during the CS Research Mentorship Program? 

My latest project is called illuMATE, a bracelet designed for children with autism and other developmental disabilities that monitors heart rate via an Arduino pulse sensor. When it detects a spike in heart rate, it sends a series of customizable vibrations down the child’s wrist to help them relax. Touch-pressure and vibration technology has been clinically proven to help those with autism de-stress. My goal with CSRMP is to work with my mentor Rachel to further develop my project and framework with supporting research, and learn more about how product management works at Google.

We are humbled to support such exceptional students as they pursue CS research careers. Look for these 37 names in future headlines as they confront our greatest challenges (and solve them).


          

This guy hand-makes and sells giant LEDs

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You can buy a giant LED from a guy who makes them at home. The cost about $70.

From his site:

My first Maker Faire as a maker was New York 2012, I brought a Giant Arduino Starter Kit (YouTube video Giant Arduino Starter Kit - A 10x Scale Model). Everything was ten times scaled up; the Arduino Uno, breadboard, resistors, potentiometer, LDR, jumper wires, and LEDs.

As the LEDs were portable, I would bring an LED with me to other Faire's, it has always been received well and many times people would ask was it for sale.

In September 2018 I decided to explore turning the rough model in to something that I would be happy to sell. The following YouTube playlist records some of the progress in Making a Refined Giant LED.

[via Evil Mad Scientist] Read the rest


          

#91 Linux Connexion con Luis del Valle

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¡¡¡Muy buenas amante del Software Libre!!! Bienvenido a otra entrega, la número 91, de Podcast Linux. Un saludo muy fuerte de quien te habla, Juan Febles. Hoy está con nosotros Luis del Valle, apasionado del mundo de Arduino y del Movimiento Maker, está detrás del blog Programarfacil.com, del podcast La tecnología para Todos y del Leer más#91 Linux Connexion con Luis del Valle[…]

La entrada #91 Linux Connexion con Luis del Valle aparece primero en AVpodcast.


          

#90 Arduino

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Muy buenas, oyente de Podcast Linux, mi nombre es Juan Febles y hoy tenemos episodio sobre una placa de Hardware Libre. En poco más de media hora te comentaré qué es Arduino y todas las posibilidades que tiene. Ya estés en trayecto, haciendo deporte o tareas del hogar, paseando o en tu casa, te doy Leer más#90 Arduino[…]

La entrada #90 Arduino aparece primero en AVpodcast.


          

«Ты узнаешь ее из тысячи...» или классифицируем изображения с веб-камеры в реальном времени с помощью PyTorch

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Вот бывает же в жизни такое. Сидишь себе не шалишь, никого не трогаешь, починяешь примус, а тут из этого примуса, из телевизора, да и вообще из каждого утюга, до тебя доносится: «нейронные сети, глубокое обучение, искусственный интеллект, цифровая экономика…».

Я — человек, а значит существо любопытное и алчное . В очередной раз не удержался и решил узнать на практике, что такое нейронные сети и с чем их едят.
Как говориться: «Хочешь научиться сам — начни учить других», на этом я перестану сыпать цитатами и перейдем к делу.

В данной статье мы вместе с вами попробуем, решить задачу, которая как оказалось будоражит не только мой ум.
Не имея достаточных фундаментальных знаний в области математики и программирования мы попробуем в реальном времени классифицировать изображения с веб-камеры, с помощью OpenCV и библиотеки машинного обучения для языка Python — PyTorch. По пути узнаем о некоторых моментах, которые могли бы быть полезны новичкам в применении нейронных сетей.

Вам интересно сможет ли наш классификатор отличить Arduino-совместимые контроллеры от малины? Тогда милости прошу под кат.


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Escape Room - Webclient - Arduino + Ethernet

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Escape Room postavený na platforme Arduino s Ethernet shieldom. Systém je postavený na komunikácii s webovým rozhraním, ktoré zároveň slúži na správu kombinácii, ktoré je možné meniť dynamicky aj počas hry.
          

IBM IoT Foundation, Part 3

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I am trying to follow this tutorial (https://www.ibm.com/developerworks/br/cloud/library/cl-arduino-iot3-app/index.html) where parts 1 and 2 are already available but when to go to "Run the application", get the following code: 404 Not Found: A requested route ('mynginx.mybluemix.net')) does not exist. I cannot find the location where my IBM ID is allowed to access OAUTH. So that continue the tutorial. Would you help me?
          

Fetch : un affichage Ferrofluide à base d’Arduino

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Load the MRLComm which came with the version you have - its available through the webgui

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Error uploading mrlcomm.ino to arduino

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Hello Guys,

I am posting for somebody that has an issue uploading the MRLComm.ino to his Mega Arduino.

He seems to encounter the same pb on a Mac and A PC. Any suggestions when looking the error log?

I can't think of a solution.

Here is the link to our conversation:

read more


          

Las mejores ofertas en cursos del Black Friday 2019

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Las mejores ofertas en cursos del Black Friday 2019

Black Friday 2019 ya está aquí y con él famoso día llega una avalancha total de ofertas no solo el mismo viernes, sino el los días previos y posteriores. En Genbeta hemos estado recogiendo algunas de las oportunidades más interesantes relacionadas con software y servicios y ahora haremos lo propio con cursos online en español sobre computación, programación, hacking y ciberseguridad.

Si bien hay mucho que se puede aprender online gratis, algunas ofertas educativas más completas, con certificación y demás beneficios suelen ser de pago. Pero las plataformas de educación en linea no pierden la oportunidad durante estos últimos días de noviembre y principios de diciembre para también unirse con sus propias promociones.

Cursos a 9.99 euros en Udemy

Adi Goldstein Mdinbvq1sfg Unsplash

Cursos a 9.90 en Domestika

Kelly Sikkema Yk0hpwwdj1i Unsplash

Cursos con 70% de descuento en Tutellus

Kobu Agency 67l18r4tw W Unsplash

Utiliza el cupón BLACKFRIDAY antes de inscribirte para ahorrar hasta un 70%.

Descuentos de 25% en los cursos online de Securizame

Fabian Grohs Dc6pb2jdaqs Unsplash

Apple Coding Academy

Hasta el 5 de diciembre puedes obtener un 30% de descuento en los cursos de Swift 5.1 y Desarrollo de apps con SwiftUI. Si combinas las ofertas y tomas los dos cursos puedes obtener 35% de descuento. Los cursos de Apple Coding en Udemy tienen un descuento del 52%.

Más ofertas

  • 3 meses de Amazon Kindle Unlimited por 29,97 euros gratis.
  • 4 meses de Amazon Music Unlimited por 0,99 euros.
  • 30 días de Amazon Prime gratis.

Puedes estar al día y en cada momento informado de las principales ofertas y novedades de Xataka Selección en nuestro canal de Telegram o en nuestros perfiles de Twitter , Facebook y la revista Flipboard. Puedes echar un vistazo también a los cazando gangas de Xataka Móvil, Xataka Android, Xataka Foto, Vida Extra, Espinof y Applesfera, así como con nuestros compañeros de Compradicción. Puedes ver todas las gangas que publican en Twitter y Facebook, e incluso suscribirte a sus avisos vía Telegram.

También puedes encontrar aquí las mejores ofertas del Black Friday 2019.

Xataka Selección
ofrece:
Descubre las mejores ofertas en Tecnología del Black Friday que hemos seleccionado para ti en Xataka Selección. ¡No te las pierdas!

Nota: algunos de los enlaces aquí publicados son de afiliados. A pesar de ello, ninguno de los cursos mencionados han sido propuestos por las webs, siendo su introducción una decisión única del equipo de editores.

          

Open Hardware: Arduino and RISC-V

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  • OpenGradeSIM is an open source incline simulator for indoor bike trainers

    Although he would probably rather be outdoors, after an injury Matt Ockendon had a lot more time to ride his Tacx Neo indoor trainer and tinker. He decided he wanted his rig to be able to simulate the grade of hills, but as commercially available units with this capability are quite expensive, he instead devised his own solution dubbed “OpenGradeSIM.”

    [...]

    With this data in hand, the Nano controls a linear actuator using an L298N-based driver board to raise or lower the bike’s front end. The derived bike angle is sensed via the Nano’s built-in IMU, providing an elegant closed-loop system. Additionally, the incline is shown on a 1.3″ I2C OLED display that serves as a mini dashboard while Ockendon cycles.

  • [Reposted] U.S.-Based Chip-Tech Group Moving to Switzerland Over Trade Curb Fears
  • RISC-V moves to neutral Switzerland over trade disruption

    The nonprofit RISC-V Foundation is relocating to Switzerland over concerns about the impact of U.S. trade policies.

    Foundation CEO Calista Redmond told Reuters that its members are “concerned about possible geopolitical disruption.” The foundation’s board approved the move unanimously after hearing members around the globe say that they would be “a lot more comfortable… if the incorporation were not in the U.S.,” she added.

    RISC-V is a young organization, founded in 2015 and located in Delaware, to set standards for chip architectures that are allowed to use the RISC-V trademark on its products. RISC-V is a reduced instruction set architecture that is open source technology that anyone can use to design, make or sell RISC-V chips and software for electronics.


          

9 of the Best IoT Projects Using Arduino

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If you’re an electronics hobbyist, chances are you’ve heard of the Arduino. It’s a tiny computer that you can use to do surprisingly complex things. It also happens to be behind a fair number of Internet of Things projects.

While some people reach a for Raspberry Pi or something even more powerful, an Arduino or Arduino Uno might be all you need. We’ve put together a list of IoT projects that prove this to be true.

Read more


          

«Ты узнаешь ее из тысячи...» или классифицируем изображения с веб-камеры в реальном времени с помощью PyTorch

 Cache   
Вот бывает же в жизни такое. Сидишь себе не шалишь, никого не трогаешь, починяешь примус, а тут из этого примуса, из телевизора, да и вообще из каждого утюга, до тебя доносится: «нейронные сети, глубокое обучение, искусственный интеллект, цифровая экономика…».

Я — человек, а значит существо любопытное и алчное . В очередной раз не удержался и решил узнать на практике, что такое нейронные сети и с чем их едят.
Как говориться: «Хочешь научиться сам — начни учить других», на этом я перестану сыпать цитатами и перейдем к делу.

В данной статье мы вместе с вами попробуем, решить задачу, которая как оказалось будоражит не только мой ум.
Не имея достаточных фундаментальных знаний в области математики и программирования мы попробуем в реальном времени классифицировать изображения с веб-камеры, с помощью OpenCV и библиотеки машинного обучения для языка Python — PyTorch. По пути узнаем о некоторых моментах, которые могли бы быть полезны новичкам в применении нейронных сетей.

Вам интересно сможет ли наш классификатор отличить Arduino-совместимые контроллеры от малины? Тогда милости прошу под кат.


Читать дальше →
          

Arduino projects - The Ultimate Beginner's Guide to Learn DIY Arduino Programming

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none
          

Arduino Obstacle Avoiding Car

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In this video, the presenter is going to build an Obstacle Avoiding Car using an Arduino Development board. Courtesy: DIY Builder

The post Arduino Obstacle Avoiding Car appeared first on Electronics For You.


          

Support for Arduino IDE 1.8.10

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Hi Greig, I've been running a NodeMCU for quite some time - perfect solution to security device connectivity. This is using Beta 145. Recently...
          

Manual link is broken in the sticky - help please

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I have the Arduino connected to Homeseer without issue. I have a Ultrasonic sensor that requires a 10 ms HIGH written to the Output pin such as...
          

Bugs

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Hello Greig, - Arduino Uno : I can't delete a PWM pin from the configuration page : I select the #pin, click on the red cross, still there. ...
          

Projet montre oled Arduino /Autonomie/

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Forum: Informatique générale Ecrit par: Projet123 Heure du Message : 23/11/2019 à 14h37
          

Classroom Highlights: Coding with Altino Cars

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We're bring you a new HSTE blog series called "Classroom Highlights"! Each month we'll visit a new school or classroom to bring attention to the amazing teaching and learning that's happening across the state of Hawai'i. This month we're visiting with Deborah Orlik, a HSTE Board member at Hawaii Technology Academy.


I'm always looking for new ways to incorporate technology into my Middle School ELA classroom.  Luckily, I ran into Altino cars last summer in Oahu (on Eventbrite). Oceanit sponsored several workshops for teachers - for free.  Can't beat that!

Altino cars were made by some really smart folks in Korea. They took a cool toy car and imbedded an Arduino microprocessing unit. They added all sorts of sensors, LED lights, sounds, and whatnot.  And then we code that awesome little car using C.  If you are teaching Arduinos, this will be a walk in the C-park for your students.

As the video shows, these 8th graders could not get enough of coding and re-coding and re-trying and trying again. It was everything you would like to see your writing students do:  draft after draft after draft.  Nurturing and harnessing that desire to "make it right" is a life-long journey for a middle school teacher, but the excitement in that class around the Altino cars and the coding was enough energy to light up Honolulu for a week!  So much fun!  Great learning!

If you are interested in finding out more about Altino cars, you can email me at dorlik@myhta.org.  I can share the short story I used to connect the cars to our reading.

Deborah Orlik is a current HSTE Board member. She is also an English and Language Arts teachers at Hawaii Technology Academy.





          

Connect ESP32 Arduino With a Samsung Smart Watch

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We can create an ESP32 Web Server, connect & control LED from watch browser. Here is How to Connect ESP32 Arduino With Samsung Smart Watch.

The post Connect ESP32 Arduino With a Samsung Smart Watch appeared first on The Customize Windows.


          

Comentario en pir_rele por Julieta Cerón

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Hola buenas tardes... disculpe quisiera saber los nombres de todos los componentes que utilizo para hacer el circuito sencillo del circuito PIR o donde encuentro ese sensor en proteus... aun no veo arduino y las unicas librerias que encontrado son para arduino...
          

Comentario en Sensor HC-SR501 con Arduino. por Vicente García

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Hola Victor. Puedes encontrar algún código en la red que te de la distancia de un objeto hasta el sensor, pero considero que este tipo de sensor al ser pasivo, no te dará mucha exactitud. Piensa que detecta movimiento y no emite nungún haz de luz o señal de ningún tipo, sólo recibe la señal del objeto que se desplaza. No obstante hay códigos en la red que te pueden ayudar al cálculo por comparación. Saludos.
          

Comentario en Sensor HC-SR501 con Arduino. por Vicente García

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Hola Juan. Disculpa el retraso en la respuesta. Para que realice la función de estar activo mientras haya movimiento, prueba a reducir al mínimo el tiempo de espera a la detección, de esa forma, mientras haya movimiento se estará reactivando y cuando no lo haya se detendrá. No lo he probado, pero la lógica me dice que puede funcionar. Es cuestión de probarlo. Saludos
          

Comentario en Sensor HC-SR501 con Arduino. por Victor

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Muy buena informacion Una pregunta, ¿Hay alguna forma de saber la distancia de un objeto utilizando este sensor? Gracias
          

The Bus Pirate & my High-2-Sea Adventure.. Arrrrrrr !

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This past week I’ve been busy hacking on an Arduino project that uses the I2C bus. It’s been ages since I’d used the Wire library so I was more than a little rusty. Thankfully when it came time to test … Continue reading
          

Adafruit IoT Monthly: Machine Learning 101, PWNing the ESP32, and more!

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IoT Projects

Running ML on Particle Hardware, ML 101

Tensorflow Lite now runs on newer Particle devices! Brandon Satrom published a very detailed tutorial about running TFLite on Particle devices. - Particle

Do your chores or else I’ll cut off the internet!

AccidentalRebel is creating a device “that monitors and logs if my kids have done their chores and daily tasks. If not, their devices won’t have access to the internet.”. When their chores for the day are complete, their device will automatically re-connect them to the internet. - Hackaday.io

ESPRing Clock

ESPRing is a NeoPixel ring with an onboard ESP module. The ESP connects to WiFi and fetches the NTP time. - Hackaday.io

AutoHome - Universal Home Automation with Raspberry Pi

rirozizo is building a home automation system powered by a Raspberry Pi “to remotely control any possible home appliances without the use of proprietary hardware and apps”. They’re using the (free) Adafruit IO service as the MQTT broker and for data visualization. - Github

Voice-Controlled PyPortal Smart Switch

Dan the Geek is improving their PyPortal-based Smart Switch. They connected it to Adafruit IO’s IFTTT integration so they can turn a light on or off using voice commands over Alexa or Google Assistant. - Twitter

Evaluating Motion Sensors, Microwave v.s. PIR

Akarush wrote a detailed log of his evaluation for two motion sensors - a RCWL-0516 and a PIR motion sensor. The results? Each sensor has unique advantages and disadvantages. - Hackaday.io

Bluetooth-based Costume Props using Arduino and ESP32

Juan Carlos Jiménez hosted a costume party and integrated their costume with the house decorations. This BLE-powered costume prop is spooky. - JCJC-Dev

RGB Weather Strip

This RGB LED Strip changes color based on the weather forecast outside. - Hackaday

Code-less IoT Projects with Node-RED on Raspberry Pi

Les Pounder posted a tutorial about using the Node-RED development tool…

Node-RED is an awesome tool and anyone, yes anyone can make something with it. All you need is a web browser and a device with Node-RED. Node-RED uses JavaScript syntax, but we do not have to write any code, rather we link nodes together.

Around the Internet - IoT News

PWNing MBEDTLS on ESP32

LimitedResults found vulnerabilities with the ESP32 which allows an attacker to compromise the cryptographic library on the ESP32, MbedTLS. It’s important to note that an adversary will need physical access to the ESP32 module as it’s been compromised using a voltage-glitching attack. While this doesn’t impact hobbyists, it is a an attack on the hardware module (you can not roll out new software to patch it). If you have an ESP32 module in the field, it is potentially vulnerable to this type of attack, given an attacker’s resources and time. It looks like Espressif is following this report. They tweeted after ESP32 was pwned a couple of months ago: “We have upgraded the hardware; stay tuned for ESP32v3 with improved security and performance!”. We are unsure if this impacts the ESP8266 or the upcoming ESP32-S2 module.

Adafruit joins the Zephyr Project

The Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with safety and security in mind, and we’re thrilled to announced we’ve joined the project. - Adafruit

Mozilla is building a “Web of Things”

Mozilla is building an “open platform for monitoring and controlling devices over the web”.

The idea of the Web of Things is to create a decentralized Internet of Things by giving things URLs on the web to make them linkable and discoverable, and defining a standard data model and APIs to make them interoperable.

Read more on Mozilla IoT…

Amazon’s long-term plan for Alexa

An interview with Rohit Prasad, Alexa’s head scientist, revealed details about where Amazon wants to head with their powerful voice assistant. - TechnologyReview

Hackable Smart Watch powered by Espruino

Bangle.js is a hackable, open-source smartwatch that can be easily customized. It’s currently crowdfunding on Kickstarter and may fill the space on our wrists from Pebble’s acquisition by Fitbit. The bangle packs more of a punch than a pebble with a nRF52832, 64kB RAM, heart rate monitor, accelerometer, magnetometer and a 350mAh battery. - Kickstarter

Best Buy discontinues Insignia IoT Products

Insignia, Best Buy’s generic hardware brand, has shut down every product which replies on their app (including a freezer). Each time this happens, we think about how many products in our lives rely on “other peoples servers”. Do you have a contingency plan for the IoT devices in your life? - Hackaday

Recognizing AI Snake Oil

AI has been intertwined with IoT (AIOT). But, “Much of what’s being sold as ‘AI’ today is snake oil — it does not and cannot work.”. This paper addresses the important questions of “Why is this happening? How can we recognize flawed AI claims and push back?” - Princeton

Analyzing NB-IoT and LoRaWAN Sensor Battery Life

Low power wide area network (LPWAN) technologies like NB-IoT and LoRaWAN are perfect for your projects requiring small packets, long battery life, and long distances. But how long will the batteries in your IoT project really last? - Semtech Developer Journal

Adafruit IoT Updates

Promotion: 1 Year of Adafruit IO Plus Free with $250 Adafruit Purchase

We’re running a special promotion! As of November 20th, 2019 5:30pm, if you place an order of $250 or more at Adafruit, you’ll receive a 1 year subscription to Adafruit IO+. You’ll receive a minimal yet elegant Adafruit IO+ Subscription Card! This card comes with a code on the back and when typed into your Adafruit IO account, will activate a full year of Adafruit IO+ service for all the IoT projects you can dream up.

Promotion: Google AIY Voice Kit for Black Girls CODE

For a limited time, whenever you buy a Google AIY Voice Full Kit the regular price of $59.95 here, on this page, Google will automatically donate one to Black Girls CODE. Black Girls CODE goal is to empower young women of color ages 7-17 to embrace the current tech marketplace as builders + creators. Check out the bundle on Adafruit’s website.

What is Adafruit.IO?

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RE: doska s fpga & sram problem

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co je to za pec? nedalo by sa to nahradne ovladat cez arduino?


          

RE: doska s fpga & sram problem

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Je arduino platforma schopna citat a ovladat to co popisujem v dnesnom komente Alojzovi ?


          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Evo konkretna funkcija za filtriranje/oversampling (moving average), FILTER_OVERSAMP moze da bude bilo koja vrednost od 1, 2, 4, 8, 16, 32 ... 4096, 8192 ... dok ne "zakucate" kontroler, jede RAM memoriju :) Ako je uloga tog MCU u "životu" da samo meri napon i to radi ceo dan a imate resursa viska, tu mozete da ih potrosite bar za nesto korisno :) Upotreba je prosta, samo se rezultat sa A/D "provuce" kroz tu funkciju, ona ce tehnicki tek posle X-tog puta (FILTER_OVERSAMP) poceti da radi...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Citat: "[url=/p3923632]Brkic[/url]:  Još jedno pitanje, zašto je tl431 bolji i precizniji od npr. LM7805, naravno u smislu da se TL431 podesi da bude na 5v ?? " TL431 pa i LM317 ima bolje tehnicke karakteristike od LM7805, to je mator regulator, sada ima neuporedivo boljih, TL431 je tehnicki izvor referetnog napona, samo to mu je uloga, malo stuje daje ali napon daje vrlo stabilno dok sa druge strane 7805 je snagas koji tera 1A, to dobro radi ali su mu ostale karakteristike truba. Kada ...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Da tako, probaj razne vrednosti kondenzatora, idi slobodno i do 1uF, vidi sta ti najvise odgovara. Otpornicki razdelnik ispred ulaza ti ostaje, ne moze bez njega u toj postavci sa kondenzatorom. Ono sto si pisao u programu da si uzorkovao vise puta pa vadio prosek e to sad radi taj kondenzator analogno ;)
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Ovako si mislio mikikg ? [url=https://postimg.cc/yWr8D3tx][img]https://i.postimg.cc/yWr8D3tx/Voltage-Follower.png[/img][/url]
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Sad kada si stavio taj LM358 ispred ulaza u A/D imas mogucnost da stavis kondenzator izmedju ulaza u OP i prema masi (dakle ispred OP, ne posle OP, ne na nozicu od A/D) koji ce sluziti da malo ujednaci i filtrira napon. Vrednost probaj koja ti vrsi posao, recimo izmedju 100pF do 10nF, veca vrednost ce bolje filtrirati ali ce sporije da reaguje, trebace mu na primer 1-2 sekunda da se napon "smiri". Tebi to generalno lepo radi ali napon koji meris (koji jos uvek ne kontamo odakle ti i sta m...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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I kako izgleda napon sa kojim se napaja taj arduino. "Zakucaj" jedan tl431 na 2.5V i iskoristi ga kao eksternu referencu pa vidi sta se desava.
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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[quote]-sa trafom i opterećenjem od 1.5A, PWM preko FET[/quote] Ako imaš osciloskop pogledaj kako izgleda napon koji meriš.
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Hvala na pomoći i savetima, probao sam sa LM358 kako je preporučeno i rezultati su sledeći: -sa naponom iz PC napajanja sve radi OK stabilno, osciluje možda u 0.05v na 3.3v, 5v, 12v -sa trafo bez opterećenja i PWM preko FET oscilacija na 14v je oko 0.2v. -sa trafom i opterećenjem od 1.5A, PWM preko FET napon jako osciluje dok je na unimeru stabilan. Sto je viši napon npr.13v oscilacija na Arduinu je oko +/-3v tj.6v zajedno dok na unimeru pokazuje 13v stabilnih, a pri nižim naponima od ...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Citat: "*Brkic:* Evo novih detalja, uzeo drugi Uno što sam imao i sve radi skroz drugačije i stabilnije, sada linearno povećava vrednost ulaza na Analog In, 3.3 je tačan, 5.1 isto, jedino na 12 doda 0.1v, do 12 imam napon. E sada pitanje je šta može biti sa prvim Uno što mu šetaju vrednosti ? Ponovo sam probao prvi Uno i bez da ima napon na Analog In on pokazuje vrednosti i šetaju vrednosti i do 0.5v kada se preračuna! Od OP-AMP imam lm741 i lm358, koji da uzmem i može neka preporuka šem...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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He he, da si bio na 6. jubilarnom skupu dobio bi shemu na majci :) [img]https://static.elitesecurity.org/uploads/3/9/3923562/diy_tshirt19a.jpg[/img]
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Citat: "*Brkic:* Evo novih detalja, uzeo drugi Uno što sam imao i sve radi skroz drugačije i stabilnije, sada linearno povećava vrednost ulaza na Analog In, 3.3 je tačan, 5.1 isto, jedino na 12 doda 0.1v, do 12 imam napon. E sada pitanje je šta može biti sa prvim Uno što mu šetaju vrednosti ? Ponovo sam probao prvi Uno i bez da ima napon na Analog In on pokazuje vrednosti i šetaju vrednosti i do 0.5v kada se preračuna! Od OP-AMP imam lm741 i lm358, koji da uzmem i može neka preporuka šem...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Tebi je nestabilno napajanje samog ATmega328. Pogledaj malo šeme Arduino Uno (ima na netu kol'ko 'oćeš) A mogao bi da koristiš i internu referencu koja je 1.1V.
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Evo novih detalja, uzeo drugi Uno što sam imao i sve radi skroz drugačije i stabilnije, sada linearno povećava vrednost ulaza na Analog In, 3.3 je tačan, 5.1 isto, jedino na 12 doda 0.1v, do 12 imam napon. E sada pitanje je šta može biti sa prvim Uno što mu šetaju vrednosti ? Ponovo sam probao prvi Uno i bez da ima napon na Analog In on pokazuje vrednosti i šetaju vrednosti i do 0.5v kada se preračuna! Od OP-AMP imam lm741 i lm358, koji da uzmem i može neka preporuka šeme za njih ? ...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Konkretno o tome sam pisao ovde: [img]https://static.elitesecurity.org/uploads/3/8/3826758/Fluke-STM32.png[/img] To je dan danas tacno (bez reference, bez spoljnjeg A/D konvertera, bez LED drajvera!) u +/-0.002V na 30V, pa izracunajte koliko je to i sa cime je napravljeno :) Magicne reci su "OPA192 i TPS73133" ... :)
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Ne treba tu neka surovo dobra referenca, lepo "ustopovan" stabilizaror ce biti dovoljan. Ja sam radio 18+ bit A/D konverziju kod STM32 bez reference, samo malo bolji stabilizator sam koristio, konkretno TPS73133 i to je sasvim OK. Buffer/driver ispred A/D ulaza je obavezan, ne moze bez njega, zezace na sve strane i ne moze da se namesti da radi lepo bez njega, mora da se stavi! Kod ovog Arduino se barata sa 10bit A/D rezolucijom.
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Ako hoces da popravis ocitavanje moras koristiti referentni napon al taj napon nemoj da uzimas sa 7805 kao ni sa tog racunarskog napajanja. Koristi nesto kao tl431, lm4040... ili nesto slicno. Onda mozes raditi vise iscitavanja pa ispisivati srednju vrednost ili nadji neki sistem da dobijes sto pribliznije rezultate.
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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ok, moguće za 7805, ali sada sam sve spojio preko PC napajanja, 5v sam opteretio sa 10R i dobio gore pomenute napone na izlazu napajanja. Sada se Arduino napaja preko 5.1v od PC napajanja i merim njegove izlaze od 12v,5v i 3.3v čak sam sada spojio na Aref pin 3.33v preko 10k i kako sam našao to bi trebalo stabilizovati napon... i sada ima malo veće ulazne vrednosti ali i dalje nije linearan ulaz pa ima odstupanja na formuli za izračunavanja napona sada 12v očitava na ulazu sa 436 ...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Meni ovo lici da ti seta referentni napon. Vjerovatno si stavio da je napon napajanja referentni, a on seta. Nemoj pogresno shvatiti, ali 7805 si blokirao kondenzatorima? Jesi li probao neki drugi 7805, imao sam priliku vidjeti maltretirani 7805 koji radi ovako: Kad ima neka potrosnja cca 100mA skroz korektno kad se potrosnja smanji na nekih 5-6 mA pocne brljaviti sa nekim harmonicima i ima nestabilan napon. Fino instrument u ruke pa zakaci nai 5V i mjeri. Vidi ima li neke korelacije u gresci i...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Evo spojio sam sve na PC napajanje i rezultati su sledeći na 12.3v očitava izmedju 262-268 na 5.1v očitava izmedju 99-102 nc 3.3v očitava izmedju 59-61 Evo jednog zanimljivog podatka, ako je zanimljiv, Arduino sam spojio na 5v tj.5.1v i imam neki Cod koji cita VCC napon i on je 4.07v, a kada je bio spojen na trafo i 7805 očitavao je na VCC 3.5v Ubacio razme formule za preračunavanje napona i uvek ima razlike, ako naštimam 12.3 onda odstupa na 3.3v i obrnuto. Ne znam gde je zapel...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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bilo koji opamp, cak ce i uber spori 741 da zavrsi posao :D mada mu treba malo jace napajanje ... a mozes neki fancy rail to rail da uzmes .. mozes da uzmes i sample&hold kolo to ti je jos bolje .. na primer LF398N http://www.ti.com/lit/ds/symlink/lf198-n.pdf ovo sto ti je miki rekao je najlakse, obican buffer / voltage followe circuit 1 na sledecem manualu https://www.arrow.com/en/research-and-events/articles/fundamentals-of-op-amp-circuits a mozes u zavisnosti sta ti treba i peak detect...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Bas sam mislio da probam sa baterijom i sa naponom iz PC napajanja pa vidim kako meri. Ali posto meni treba kao krajnje merenje da merim taj izlaz iz trafa tu cu nesto morati dodavati. Moze li primer sa nekim dostupnim OP-AMP-om ?? Negde sam naleteo da su koristili LM324
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Ovo gore sto sam pisao moze pre nego sto napravis da probas sa baterijom, uzmi bateriju 1.5V i prikljuci direktno na kontroler i meri tu vrednost, isto tako posle prikljuci dve baterije da ispadne 3V i meri tu vrednost unimerom i preko kontrolera, izmerene vrednosti moraju da budu drasticno tacnije i stabilnije, pazi na polaritet baterija kada prikljucujes. To je samo zato sto baterija ima dosta nizu unutrasnju impedansu (imedansa izvora) i ne utice impedanza ulaza u A/D u tolikoj meri na kr...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Dovedi DC napon iz nekog ispravljača, promenljiv u tom opsegu (10V - 16V) pa onda uporedi vrednosti koje dobijaš instrumentom i tvojim mikrokontrolerom. [sub][[b]Ovu poruku je menjao goran_68 dana 26.11.2019. u 12:41 GMT+1[/b]][/sub]
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Ceo problem potice od ulazne impedanse analognog ulaza, relativno je niska, ne znam tacno kod tog kontrolera ali recimo da je izmedju 2k i 10k, nije Hi-Z reda Mohm. Dok ne stvavis jedan konverter impedanse, tj jedan jedinicni buffer sa OP-AMP, na primer OPA189 ili neki drugi "malo bolji" OP imaces te probleme, samo buffer pomaze. OP se stavlja izmedju razdelnika i ulaza u kontroler, samo konvertuje impendansu, ne radi nikakvo pojacanje, ono je jedinicno =1.
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Iisprobao sam milion kombinacija formula i uvek osciluje merenje, jedna od formula je value = analogRead(analogInput); vout = (value * 5.0) / 1024; vin = vout / (R2/(R1+R2)); pratio sam i očitavanje na Analog IN i na unimeru meri isti napon a Arduino na ulazu meri 290-350 i samim tim menja se napon merenja. Stavio sam i kondenzator od 1u na Analog IN ali nema promene. Kako sam zaključio nije linearno pomeranje vrednosti na Analog IN sa pomeranjem napona. Merim napon sa trafa gde...
          

Re: Arduino Uno Atmega328- Voltmetar- pomoć

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Daj kod da vidimo zbog čega imaš greške u merenju.
          

Arduino Uno Atmega328- Voltmetar- pomoć

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Pozdrav, treba mi da Arduino meri napon do 16vDC, preciznije 10.0v-16.0vDC, na samo jednu decimalu mi treba našao sam gomilu primera ali nikako dobiti precizno merenje, uvek osciluje merenje u odnosu na unimer...pa odjednom počne meriti 2-3v manje nego prošli put...ma užas. Arduino napajam sa stabilnih 5v (preko 7805) otpornici za merenje napona su 10k i 1k sa 1% ako neko ima dobar primer stabilnog Volt metra ?
          

pyfirmata 기초

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1. 아두이노에 firmata 설치하기


예제를 읽어들인 후 아두이노에 업로드한다.


2. pyfirmata 설치하기


pip3 insall pyfirmata


3. 파이썬으로 코딩하기

3.1 디지털핀


디지털 핀의 경우 pyfirmata의 Arduino 객체의 get_pin() 메서드를 이용한다.


import pyfirmata as pf

import time


ard = pf.Arduino('COM7')

ard.get_pin('d:13:o') #디지털핀 13번을 출력으로 설정

while True:

    ard.digital[13].write(1)

    time.sleep(0.5)

    ard.digital[13].write(0)

    time.sleep(0.5)


또는


import pyfirmata as pf

import time


ard = pf.Arduino('COM7')

p13 = ard.get_pin('d:13:o') #디지털핀 13번을 출력으로 설정

while True:

    p13.write(1)

    time.sleep(0.5)

    p13.write(0)

    time.sleep(0.5)



3.2 아날로그핀


import pyfirmata as pf

import time


ard = pf.Arduino('COM7')

print('connected.')


# 아날로그핀을 사용하려면 반드시 아래와 같은 두 줄이 필요함.

pf.util.Iterator(ard).start()

ard.analog[0].enable_reporting()


while True:

a0 = ard.analog[0].read() # [0,1]범위의 실수 반환

print(a0)


또는


import pyfirmata as pf

import time


ard = pf.Arduino('COM7')


pf.util.Iterator(ard).start()

ard.analog[0].enable_reporting()

a0p = ard.get_pin('a:0:i')


while True:

a0 = a0p.read()

print(a0)


3.3 pwm

아두이노 우노는 pwm기능이 3,5,6,9,10,11번 핀에만 있다.


import pyfirmata as pf

import time

from math import pi, sin


ard = pf.Arduino('COM7')

pwm = ard.get_pin('d:10:p')


gap = 2*pi/100

t = 0

while True:

y = (sin(t)+1)/2

pwm.write(y)

t += gap

time.sleep(0.01)


A0핀에 가변저항이 연결되어 있다고 가정했을 때 11번 핀에 연결된 LED의 밝기를 가변저항으로 제어하는 예제는 다음과 같다.


import pyfirmata as pf

import time


ard = pf.Arduino('COM7')

pwm = ard.get_pin('d:10:p')


pf.util.Iterator(ard).start()

ard.analog[0].enable_reporting()


while True:

a0 = ard.analog[0].read()

pwm.write(a0)

print(a0)


3.4 서보모터

 

import pyfirmata


DELAY = 1

MIN = 5

MAX = 175

MID = 90


board = pyfirmata.Arduino('COM7')


servo = board.get_pin('d:11:s') #11번핀을 서보모터 신호선으로 설정

 

def move_servo(v):

    servo.write(v)

    board.pass_time(DELAY)


move_servo(MIN)

move_servo(MAX)

move_servo(MID)


board.exit()



          

How to Make an Arduino Weather Station

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Does your hair get frizzy as soon as you get settled into work? Do you notice your bones rattling whenever you’re in a PTA meeting? Maybe you might want to...
          

Meet Tiny Sorter, a DIY experiment connecting Arduino + Teachable Machine

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https://experiments.withgoogle.com/tiny-sorter/view/assets/img/hero/hero_wide.mp4 Getting started with physical computing and machine learning can be pretty intimidating. But it doesn’t have to be! Meet Tiny Sorter, a DIY experiment that teaches you how to...
          

Soldering Headers to a PCB - Category5 Technology TV (Clips) - Episode 630-soldering-header-pcb

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Category5 Technology TV (Clips)

Once you start working with Arduino or even Raspberry Pi HATs and pHATs, you're likely going to find yourself needing to attach the headers yourself. As a rookie maker who's quickly learning the ropes, Robbie shares a couple quick tips that he has found can make it easier to solder these pin headers directly to the PCB.

Read the complete show notes, comment or rate this episode, view pictures and obtain links from this episode at https://category5.tv/shows/clips_tech/episode/630-soldering-header-pcb/

Running time: 7 Minutes 44 Seconds


          

Comment on Arduino Bluetooth Automation – App Virtual Response (Like J.A.R.V.I.S) by espn.com/activate

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Valuable information. Lucky me I found your web site by accident, and I’m shocked why this accident didn’t happened earlier! I bookmarked it.
          

Robot car controlled by mit app, it has temperature and gas sensors

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Hello .. my project is about Robot car controlled by mit app .. I have the app and the arduino code ready but I need my robot car to send SMS to phone numbers if the temperature & gas sensors detect any... (Budget: $10 - $30 USD, Jobs: Android, Mobile App Development)
          

Charla sobre introducción al arduino

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Excellent article, merci ! sur Contrôler un moteur pas à pas (comme sur une imprimante 3D, CNC etc...) Arduino, cnc shield, Simple G-code décodé

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Excellent article, merci !
          

[WM23] How to send value via wifi (ESP8266 + Arduino) (2 replies)

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Hi All,

I was success to test a simple program on how to handle Relay(On/Off) using ESP8266 wifi module and Arduino Uno.

The apps is using third party apps at google playstore. I dont know how they make it but its work.

Unfortunately im not success to send the 1 and 0 value to this program using WM23.

I have try using SocketWrite, SocketExist, Httprequest but still no success. When im test the send button, mostly no error info and the WM apps will close immediately.

To control Relay(On/Off) using the Bluetooth connection via HC-06 device with Arduino is no problem. Easy and success using Windev Mobile.

But cannot find an easy solution for Wifi.

Any clue or guidance?

Thanks a lot.

Regards,
Mujahid
          

Arduino Meets LabVIEW

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صورة: https://i111.fastpic.ru/big/2019/1202/b5/6e5ac2a47a2955ea7d184a2b5b3542b5.jpg Genre: eLearning | MP4 | Video:AVC 1920 x 1080 | Audio: AAC 48.0 KHz Language: English | Size: 497 MB | Duration: 1hr 13m The course lesson will explain "How to work on Arduino and LabVIEW" by using C...


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