Notes:
Internal pull-up does not work on GPIOs:
- 36
- 39
- ...
Internal pull-up works on GPIOs:
- 23
- 22
- 11
- 10
- ...
using the arduino esp32 build, i've tested all pins and found the following work with INPUT_PULLUP: 14, 16, 17, 18, 19, 21, 22, 23 as expected
but these do not: 13, 25, 26, 27, 32, 33 .