- Wed Feb 25, 2015 9:23 pm
#180055
I bought a cheapo RFID reader on eBay that outputs 12v when a valid key fob is presented. It came with a 12v Songle relay.
Will it damage my Arduino if I connect the switching side of the relay to a 5v regulated power supply and to the digital input of the Arduino? I found lots of results on related topics and am reading up on zener diode, 7805, etc but since I don't have any of those at the moment I figured I'd ask about this relay.
Will it damage my Arduino if I connect the switching side of the relay to a 5v regulated power supply and to the digital input of the Arduino? I found lots of results on related topics and am reading up on zener diode, 7805, etc but since I don't have any of those at the moment I figured I'd ask about this relay.