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The goal of this project is to provide everything you need to know to build your own eXtreme Feedback Device (XFD) at a reasonable cost (round about 10 Euros).
The device based on a PIC18F13K50 micro controller from Microchip and a traffic
light gadget Pearl Traffic Light.
The schematic of the device is quite simple: 
A list of parts used in the schematic is generated as hardware/XFD.bom. Additionally you will need a piece of stripboard, three LEDs (red, yellow and green) as output device or something similar (see above) a case and an USB cable. Optionally you can add a socket for the PIC if you prefer to not solder it directly.
You can find part numbers and prices (Jul/2012) from Reichelt in the file prices.gnumeric.