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, first unzip the included Firmata-2.1 firmware and follow the README included in there. Then you'll be able to choose firmware from Arduino application, in the menu: File -> Open -> Examples -> Library-Firmata Once you have uploaded a firmware to your Arduino 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/Firmata WARNING! This version of the arduino object for Pd will only work with 2.1 versions of Firmata. It will NOT work with older versions of the firmware! Hans-Christoph Steiner