How to emulate a RFID key, cheaply?
We have a RFID key which costs 50 bucks to get a copy of!, There is no code on the back of it either. So, I figure, I'm mechanically inclined, I know how to solder, I can read electrical schematics, I understand diodes, caps, variable resistors, resistors, switches, leds, grounds...so on and so forth. I by no means understand it all.
Anyways, I am rambling. How could I build a cheap (under 50) key emulator? Just to keep in the Jeep for when this happens again