Code
Information
All files (firmware, arduinomeSerial and source) are now hosted on the Arduinome sourceforge repository. (http://www.sourceforge.net/projects/arduinome)
Make sure to click “view all files” to find the not only the firmware you must upload to your Arduino board, but also ArduinomeSerial, the software (serial-to-OSC/Midi translator) needed to properly communicate with your computer.
ArduinomeFirmware is Platform Independent and there are both Mac+PC versions of ArduinomeSerial.