I need help designing a hardwired circuit that will alert me when my dog goes in and out the pet door, I'm disabled and 80% deaf so an audible device won't work, lol! I want to use a magnetic door contact from a home alarm system, an LED, a plug-in power supply and a relay to send power to the LED when the pet door is open, it does not need to be a latching circuit because I want the LED to go off when the pet door closes! LED on when open, LED off when closed! Sounds simple enough, can anyone help me?