Comments 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

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/

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 […]

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/

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. […]

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 | _|_

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

By: ESP32 和 ESP8266 的 GPIO (UART) 是否可以承受 5V 電壓（答案是可以的） – EVB開發板學習紀錄與教學分享

ESP32 和 ESP8266 的 GPIO (UART) 是否可以承受 5V 電壓（答案是可以的） – EVB開發板學習紀錄與教學分享 — Wed, 19 Oct 2022 03:04:27 +0000

[…] https://ba0sh1.com/2016/08/03/is-esp8266-io-really-5v-tolerant/ […]

By: Are the ESP32 and ESP8266 5V tolerant (Yes they officially are) – Tech-G

Are the ESP32 and ESP8266 5V tolerant (Yes they officially are) – Tech-G — Wed, 19 May 2021 13:16:17 +0000

[…] the results were conclusive or whether there was more to the story, a convincing experiment by ba0sh1.com did demonstrate that it was indeed 5 Volt tolerant on the input […]

By: atesin

atesin — Wed, 16 May 2018 06:14:46 +0000

i was cracking my head (and my pocket, and my watch) also.. testing with an ftdi usb serial adaptor that works smoothly, but with arduino and level conversors, dividers, etc never could get to work properly, so after thinking i “dared” to do some tests directly with 5v i/o (i have a separate 5v 1A > 3.3v s1117 voltage regulator circuit to vcc)

i still find it a little risky, so i want at least to put some serial resistor to drop voltage to 3.3v before, but that depends on gpio impedance….

q1 = does anybody know how much resistance gpio pins have? .. i can’t measure them since they send pulses and i have just a (cheap and slow) digital multimeter …. i intend to “simulate” a voltage divider, but for 5v to 3.3v to work the series resistor have to be about half of the gpio resistance value

q2 = does anybody actually knows directly which ohm value the gpio series resistor could be? … or could so some tests, find it and share with us? … thanks in advance