Crypto Shield Hookup Guide
This Tutorial is Retired!
This tutorial covers concepts or technologies that are no longer current. It's still here for you to read and enjoy, but may not be as useful as our newest tutorials.
Contributors:
jbdatko, 
CaseyTheRobot
jbdatko, CaseyTheRobot 
RFID Socket
The RFID socket on the shield works best with SparkFun's RFID ID-12LA. Simply attach the reader and when a tag is read, the reader will write out to the Arduino hardware serial lines. It will also flash the "stat" light on the CryptoShield. Using the ID-12LA, the RFID tag, button, and capsule can all be read.
An example Arduino sketch that will read the tag and echo it back over the Serial port can be found here.