For a small project I'm working on I needed to attach a few buttons to a Raspberry Pi and have some code execute in response to the button presses.

Normally I would reach for Python for a simple project like this, but constraints of the project made it necessary to implement something in C with minimal dependencies. I didn't want to write something that was tied closely to my project...

I recently acquired both a Raspberry Pi and a PiFace IO board. I had a rough time finding examples of how to read the input ports via interrupts (rather than periodically polling for values), especially for the newer versions of the PiFace python libraries.

After a little research, here's some …

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 …