Hi. I have simple circuit for camera remote shutter. I wanted to separate Arduino from camera circuit so decided to go with ouptocoupler.
- NodeMCU hangs right after attaching power source
- works when start withoud D2 connected and then connect it after second
Whole circuit works except that I can't just power it up with D2 connected. Also I can't programm board if optocoupler is connected. Camera shutter works fine with this circuit. Problem seams to be only on start. D2 is configured as output.
I'm prividing simple circuit to explain it.