Why buy an off the shelf product if you can make it yourself. That is what some guys at Cornell University decided to do when they needed an RFID reader.
“For our final project, we designed and built (and exhaustively tested) an RFID-based proximity security system for use with Cornell Identification cards, which have been RFID-embedded since fall of 2003. The idea for this project was sort of spawned from our general interest in RFID technologies and the near-simultaneous occurance of Lab 2 (Keypad Security System) and the antiquated lock system at our fraternity house breaking.”
Via : Make