Marroond:
Can you just add the RFID to your current setup? Keep all your hard-wiring, but simply add the RFID.
What would I gain from using RFID to tell what gun is in my hand when I can just use the voltage divider that I'm going to try this weekend? Yeah an RFID tag is pretty cheap and all, but it adds a layer of complexity that is really unnecessary (even thought he whole setup is really unnecessary). And then whats to say that its not gonna start getting interfered with by the motor in the gun (I dunno if the interference from my own would be too bad cause its a metal gun that I havent been able to get interferance from, but I know one of my friends guns causes static on walkietalkies 10ft away when he shoots, and how harmful woudl that be to the RFID reader?)