This package includes a Pd object and a matching Arduino firmware. It allows you to control the Arduino board from Pd without having to program in Arduino's C++ To use it, open Pd_firmware in Arduino and upload it to the board. Open up arduino-test.pd in Pd, then choose your serial port with the [open( message. For more on Arduino, go to http://arduino.cc You can get more information about this firmware here: http://www.arduino.cc/playground/Interfacing/Sensorbox Hans-Christoph Steiner