Which pins are free to use

[Garry J]

Hi All,

I'm not a programmer, I just have a project I'm pursuing as a hobby.

I'm using the Expressif ESP32 Development board from Adafruit and I'd like to know which pins are free to use as IO.

I'm using the I2C bus for my project and the USB port for power and debugging. I think some of the remaining ports may be used by the system but I find the data sheet confusing. Any help will be greatly appreciated.

Thanks in advance

Garry J

[WiFive]

Avoid SD0, SD1, SD2, SD3, CMD, CLK. TXD0, RXD0 are usb uart. Look up strapping function of IO0, IO2, IO12.

https://raw.githubusercontent.com/gojim ... pinout.png

[Garry J]

Thank you

[szguyer]

Also: don't forget that pins 34-39 are input only.