Using the wonderfully simple Sparkfun RFID kit I was able to get some sweet RFID integration using a simple software serial port on the ardunio and three wires (+ve, -ve, TX).
This is the MAX/MSP RFID code that records the serial numbers of the tags and gives them a integer value. The code will then action according to which integer has been detected.
The code slices of the stop and starting bits, does a bit more processing and send a midi out to control playback in Ableton live.
