Simple high signal from one ESP to another

Other Hardware General Electronics
1

Hi,

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?

2

Can I just connect one ESP-pin to another?

Yes, you can wire them directly together.

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.

3

Perfect. Thank you very much :slight_smile:

4

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. :grinning: