I am working on a project at the moment that needs a mobile RFID station, i.e. an RFID reader that wirelessly transmits the IDs of the cards and objects that it scans to a receiver station (in this case another Arduino). I implemented this scenario using an ID-20 RFID reader, two XBees and two Arduinos.
Find source code here: https://github.com/markbil/Mobile-RFID-Reader
The project contains two Arduino sketches, one for the Mobile RFID-Reader and one for the XBee receiver.
It is based on the code from
– http://www.arduino.cc/playground/Code/ID12 and
The wiring of the ID20 is based on hcgilje’s description: