Hello all,
I currently have a DFROBOT 4 Relay Sheild V 2.1, my goal is to trigger the device via an external source e.g a contact or signal, just for starters.
My ultimate goal is to have the Arduino board receive a signal that will begin to check the status of a reed switch, once all conditions are satisfied I then would like it to trigger / send a signal to the external device to perform a function.
any help even a simple start would be appreciated.
Regards
Theodore.