Pduino: The Firmata firmware and matching Pd object.
Help patch:
Arduino2PD: an easy way to read Your Arduino from PD, using the SimpleMessageSystem.
Consists of an Arduino Firmware and a PD-patch.
Get the files here
Get the SimpleMessageSystem library for Arduino here
Simple method to realising a clear text ascii data communication between arduino and pure data. Messages to and from arduino look like:
A 123 456 -789 1234
get more info and download here