Comments for Digital Me

Comment on HOWTO: Use STM32 SPI half duplex mode by Alex

Alex — Sat, 18 Apr 2026 17:26:01 +0000

In reply to Pierre. duplex is not simplex so by definition duplex is communication both ways.

Comment on Is ESP8266 I/O really 5V tolerant? by pisa

pisa — Wed, 08 Jan 2025 13:45:06 +0000

In reply to ian. how is it holding up? lol

Comment on Is ESP8266 I/O really 5V tolerant? by Yazeed Almadaeen

Yazeed Almadaeen — Wed, 03 Jul 2024 19:45:18 +0000

Your results are accurate, they are 5V tolerant, an official statement from espressif makes it clear that the digital input pins are indeed 5V tolerant in sink mode.

But your research here ads confidence that it is also reliable !

What is weird is that while I was double checking that it is compatible, Google took me here, and to my surprise, I can see a post of mine has registered on this page as a pingback but using my old domain, so for anyone looking for the official statement from espressif, i made a blog post about the topic years ago.

https://voodoo.business/blog/2021/05/19/are-the-esp32-and-esp8266-5v-tolerant-yes-they-officially-are/

Comment on Is ESP8266 I/O really 5V tolerant? by Network and cloudloading on Commodore computers – We are All Geeks!

Network and cloudloading on Commodore computers – We are All Geeks! — Thu, 13 Jun 2024 04:03:38 +0000

[…] being said, while the ESP32 is not 5V compliant, there are numerous mentions, Even from Expressif the manufacturer of the MCU, that says ESP is 5v Tolerant. Additionally, there […]

Comment on Is ESP8266 I/O really 5V tolerant? by Yazeed Madaeen

Yazeed Madaeen — Sun, 17 Mar 2024 15:30:52 +0000

In reply to bearer.

They are 5V tolerant according to espressif CEO, take a look here

https://voodoo.business/2021/05/19/are-the-esp32-and-esp8266-5v-tolerant-yes-they-officially-are/

Comment on Is ESP8266 I/O really 5V tolerant? by DIY C64 WiFi modem – We are All Geeks!

DIY C64 WiFi modem – We are All Geeks! — Tue, 13 Feb 2024 05:03:32 +0000

[…] being said, while the ESP8266 is not 5V compliant, there are numerous mentions, Even from Expressif the manufacturer of the MCU, that says the ESP8266 is 5v Tolerant. […]

Comment on Is ESP8266 I/O really 5V tolerant? by JeroenV

JeroenV — Mon, 12 Feb 2024 18:57:03 +0000

In reply to JeroenV. by the way, level shifting is easy, 3V3 out to 5V input works without any modification, and for 5V out to 3V3 in use 3x1N4148 in the direction towards the input, and one schottky diode the other way, and a 10k resistor to ground. 5V out---|>|--|>|--|>|---3V3 in |___|<|_____| _|_ |__| 10k | _|_

Comment on Is ESP8266 I/O really 5V tolerant? by JeroenV

JeroenV — Mon, 12 Feb 2024 18:47:19 +0000

I tried with the ESP32 (esp32-wroom).
The ESP32 is NOT 5V tolerant, when testing a gpio pin (no pull up) with 100uA and 500uA it clamps at about 3.6…3.7V

Comment on Hacking a cheap LED voltmeter by carlos feldman

carlos feldman — Sat, 27 May 2023 21:14:05 +0000

In reply to ba0sh1. Actgually STM Did in its AN3281 from 2010 ( poll mode ) and updated it to use interrupts, in 2016, year after your bit bang version, using a very primitive stdlib. Now (2023) I updated this version for using the ugly 2018 STDLIB with very good results.

Comment on HOWTO: Write a display driver for SEGGER emWin by CM

CM — Fri, 10 Mar 2023 03:45:45 +0000

Hi,

Is there a driver for RA8877 with 4 wire SPI interface for emWIn?
Any help on this is highly appreciated.