I've set up my Raspberry Pi to communicate with my Arduino via I2C. The Raspberry Pi is a 3.3v device and the Arduino is a 5v device. While in general this means that you need to use a level converter when connecting the two devices, you don't need to …

There are several Python libraries out there for interacting with the GPIO pins on a Raspberry Pi:

• RPi.GPIO
• The WiringPi bindings for Python, and
• The Quick2Wire Python API (which depends on Python 3)

All of them are reasonably easy to use, but the Quick2Wire API provides a uniquely useful …