This is a simple walkthrough on how to make a lock controlled with RFID tags. I show a few simple locking mechanisms, and also how to download and setup the RC522 RFID reader module. All the information is in the video.
The sketch/code and more project information can be found here:http://duinos.net/show/?id=220
The library can be downloaded from here:https://github.com/miguelbalboa/rfid