ESP32 Forum

Posted: **Sat Sep 15, 2018 11:09 pm**

I have the following GPIO available and am not sure which to use for alternative Serial.
GPIO12, 14, 25, 26, 32, 33, 34, 35, 36, 39
Which pair would you recommend and why? Or which should definitely not be used?

Posted: **Mon Sep 17, 2018 7:51 am**

12 and 14 are part of the JTAG port, if you ever want to use JTAG, I'd not use those.
25 and 26 are the DAC ports, if you ever want to generate an analog signal, I'd not use those.
34 to 39 are input-only pins and can't have pull-ups or -downs, so you can only use those for RxD and you cannot have an internal pull-up or -down there.

Posted: **Wed Oct 03, 2018 11:31 pm**

Thanks!

ESP32 Forum

Which pins would you recommend for alternative HWSerial

Which pins would you recommend for alternative HWSerial

Re: Which pins would you recommend for alternative HWSerial

Re: Which pins would you recommend for alternative HWSerial