Which pins are free to use

Garry J
Posts: 2
Joined: Wed Jan 10, 2018 11:15 pm

Which pins are free to use

Postby Garry J » Wed Jan 10, 2018 11:25 pm

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
Posts: 3529
Joined: Tue Dec 01, 2015 7:35 am

Re: Which pins are free to use

Postby WiFive » Thu Jan 11, 2018 4:46 am

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
Posts: 2
Joined: Wed Jan 10, 2018 11:15 pm

Re: Which pins are free to use

Postby Garry J » Thu Jan 11, 2018 5:54 am

Thank you

szguyer
Posts: 19
Joined: Thu Jan 11, 2018 5:41 pm

Re: Which pins are free to use

Postby szguyer » Thu Jan 11, 2018 5:42 pm

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

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