I agree, its built in.Wrong type of switch for an external manual override control as its only SPST. To externally bypass the Arduino and get manual ON/OFF control of the relay, DPDT type would be more adequate ... or SP3T with center OFF.
Yes, that could work. It depends on what you want.This switch automatically returns to the center OFF position ... this could be the default position for software control.Toggle up and hold it there to override and energize the relay.Toggle down and hold it there to override and de-energize the relay.The switch would need to be connected to the control side of the relay board, not the relay contact side. Does this meet with your expectations?
Why the ground wire on the toggle switch.That will short Vin to ground when the switch is in the off position and the left relay is active.Remove that ground wire. You don't need it.Leo..
Too bad your relay module requires 5V for the relay coils and they're not the 12V type. There won't be enough
pinMode(relayIN1, INPUT_PULLUP); pinMode(relayIN1, OUTPUT);
digitalWrite (relayIN1, HIGH); pinMode(relayIN1, OUTPUT);