Arduino Demo of SPI RFID-RC522 MiFare reader

Found information about these here: https://sites.google.com/site/arduinomega2560projects/home/level-1/arduino-rfid-rc522 and http://www.grantgibson.co.uk/2012/04/how-to-get-started-with-the-mifare-mf522-an-and-arduino/ Still not really sure how this works, looking over the code to try and figure it all out...but it does work, and I can turn LEDs on and off with RF tags :-)