I am trying to connect my arduino uno to a electric lock, using a 12v relay.
I have already done it with a 5v relay and it works, but with a 12v relay it is not working.
I have connected a 12v dc supply to the lock and i have cut the wire from the power supply so that it will connect to the relay COM and NO.
And connected the other side to the arduino and uploaded the code. The led light turns on indicating that the relay is working but when the signal is sent from the arduino the lock doesnt turn on.
If i connect the lock to the COM and NC then it works, but it stays on.
Are the connections ok?