Hello i'm making a project that contains a water pump 12v the problem is the relay is not clicking just led that on the relay gets dimmer and brighter (but led stays on always)
if i short the 5v and gnd on arduino the relay then it works, any ideas?
the first time i connected it worked all okay.
connected the relay
then the relay output
Com--- + 12v pump
gnd pump ---- gnd 12v adapter