I'm just getting started with ESP32, and have designed a PCB for the ESP-WROOM-32 that I've just delivered for production.
While waiting for the PCB to be shipped I read in Kolbans book that:
So, going back to my schematics I see that I've connected some of the pins;Note that GPIO_NUM_34 – GPIO_NUM_39 are input mode only. You can not use these pins
for signal output. Also, pins 6, 7, 8, 9, 10 and 11 are used to interact with the SPI flash
chip ... you can not use those for other purposes. - page 183
- pin 6 is going to output a PWM signal
- pin 7 has been set up to be an interrupt-input from an accelerometer.
- pin 8 to drive a LED