They built an Arduino-based rig to do inexpensive stop action photography. As Arduino projects go, it isn’t very sophisticated. The circuit contains a sound detection module and an optoisolator.

The Raspberry Pi intro is 10 hours and shows you everything from how to control it with Python to adding vision to your applications using a camera module.

Raspberry Pi has just launched the Camera Module 3 Sensor Assembly for just $15. It's essentially the same as the Camera Module 3, but for smaller projects.