I want to use separate power supply for the relay coil circuit(5v 2 amp) and separate for the signal part (from arduino) so I removed the jumper wire, now my question is the gnd pin should be connected to which power supply? 5V 2amp one or the Arduino one? Because Arduino can not handle relay load for a long time that's why I am giving separate power supply for relay circuit.
I want to use separate power supply for the relay coil circuit(5v 2 amp) and separate for the signal part (from arduino) so I removed the jumper wire, now my question is the gnd pin should be connected to which power supply? 5V 2amp one or the Arduino one? Because Arduino can not handle relay load for a long time that's why I am giving separate power supply for relay circuit.
Sir i purchase 4 relay modul but 1 relay is off only LED on relay not operate. So How i can repair it ?
When you press on off button, check click sound from relay