Mark Sanders took a popcorn popping machine and converted it for use as a coffee bean roaster. However, he needed to slow the roasting cycle down a bit for the optimum taste sensation. So, he hooked up a Raspberry Pi to control the power and, voila, mucho tasty java. The MagPi has covered it here and you can read Mark’s own account with details of the build here. Watch a video of the roaster in action below: