ESP8266 NodeMCU V1.0 ESP-12E WiFI Module

[Gina]

Does anyone here have detailed knowledge of which GPIO pins on this board can be used for digital input?  Please.

Web sites seem to give conflicting information - or more accurately, I'm not sure how to interpret the data.  I would like to use 9 or 10 digital inputs and the ADC input and nothing else.

Edited July 20, 2020 by Gina

[jiberjaber]

I'd avoid using GPIO1 & 3 (Serial port) and 16, 15 and 2 as they are used for sleep mode wake up/boot/reset

So that leaves 6,7,11,8,9,10,12,13,14,0,4,5 as potential, this again is limited further if you need to also use hardware PWM or the SPI bus.

[Gina]

Thanks Jason 😀  Looks like I can use that module then.

[jiberjaber]

12 minutes ago, Gina said:

Thanks Jason 😀  Looks like I can use that module then.

Well certainly as a proof of concept, I'd probably give it a try on breadboard to ensure as some of the pins might still be reserved or operate in an odd way which might not be obvious from a quick read of the pin outs... I've never used that many IO on one before but I have had issues with shifting around one-wire or SPI stuff away from the dedicated pins... 

[ringz]

Beware that the ADC works at a strange voltage range unless there is a voltage divider on board.