I have two ESP32 (LOLIN32) close to each other. As one does not have a job 98% of the time, I want to send him to sleep, waking by setting an appropriate pin to high.
They are powered from the same power supply, i.e. have the same ground.
Can I just connect one ESP-pin to another? Do I need a resistor? A optocoupler?
The only danger would be if they are both programmed as outputs... If one output is writing high while the other is writing low you'd get a conflict and excess current.
DVDdoug:
The only danger would be if they are both programmed as outputs... If one output is writing high while the other is writing low you'd get a conflict and excess current.
So put a 470 Ohm resistor between if this is a concern.