Re: 220v relay 5v io pins to esp8266 gpio
Posted: Wed Jan 21, 2015 1:15 pm
cant see exactly the traces on the board but you can try to find out which resistor is connected to the optocoupler input pins and try to short the resistor (R1 and R4 I think)
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IN 0-------[]----------------->|------------GND
resistor led inside optocupler