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 
- Post Time: 10-09-17 - By: http://www.rfidang.com