This package includes a Pd object that allows you to control the Arduino board from Pd without having to program in Arduino's C++.

WARNING! This version of the [arduino] object for Pd will only work with 2.1 versions of Firmata or newer! It will NOT work with older versions of the firmware! You need to get recent version of Firmata (to run on the arduino board) from https://firmata.org (resp. https://github.com/firmata/arduino)