debsahu / debsahu/PCF8574_8Relay
Use opto-isolation
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Description
The relay board has opto-isolation, so ideally it should be used to prevent damaging the ESP.
Take a look at https://forum.arduino.cc/index.php?topic=185234.msg2651260#msg2651260
I've used relay boards before, but with Raspberry. I use similar schematics to this one:
but two separate power sources could be used.
I'm not a professional electronic, so probably this can be improved :)
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