GPIO12 causes ESP boot issue

[clough360]

Using GPIO12 for the sensing LED interferes with the boot process as it is a strapping pin. The compilation process also warns about this:

This caused an issue for me where the device would boot only intermittently with GPIO12 connected. When I switched to GPIO13, the issue device booted (and worked) correctly.

I suggest changing the default yaml config file and related documentation to use GPIO13

[klaasnicolaas]

Seems like a good plan, I have no idea whether GPIO13 is better, but that something needs to be changed, that's one thing for sure.

[smulle48]

Might be an idea to use the GPIO pins from 16 and onwards :-)

https://randomnerdtutorials.com/esp32-pinout-reference-gpios/

[smarquard]

For me GPIO12 caused the OTA update to fail. I switched to GPIO5 which resolved the issue. It would be good to change the default to something else.

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[anoadragon453]

FYI GPIO15 was also a strapping pin on my board. GPIO16 was not, however.