SOLVED] 5V Relay could be broken? - Motors, Mechanics, Power and CNC - Arduino Forum

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I have a relay board but I dont know if it has optocoupler built in? - Motors, Mechanics, Power and CNC - Arduino Forum

SOLVED] 5V Relay could be broken? - Motors, Mechanics, Power and CNC - Arduino Forum

Help needed on connecting 5V relay module with Arduino - Motors, Mechanics, Power and CNC - Arduino Forum

SOLVED] 5V Relay could be broken? - Motors, Mechanics, Power and CNC - Arduino Forum