Which pins would you recommend for alternative HWSerial

Fusion
Posts: 8
Joined: Wed Apr 26, 2017 3:34 pm

Which pins would you recommend for alternative HWSerial

Postby Fusion » 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?

ESP_Sprite
Posts: 2069
Joined: Thu Nov 26, 2015 4:08 am

Re: Which pins would you recommend for alternative HWSerial

Postby ESP_Sprite » 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.

Fusion
Posts: 8
Joined: Wed Apr 26, 2017 3:34 pm

Re: Which pins would you recommend for alternative HWSerial

Postby Fusion » Wed Oct 03, 2018 11:31 pm

Thanks!

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