This "Hours Only" Drinking Bird Clock project is an excerpt from my iPad app, "How to Make a Science Fair Project." The hour--in binary--is determined by the motion of the birds. A moving bird is a "one," and a still bird is a "zero." From left to right, the birds represent, "eight, four, two, one."
This is intended to be a simple way to get "into" microcontrollers. No soldering is required, only wire wrapping and twisting wires together. The electrical work is primarily done on the breadboard, so things are just "pushed" into place.