On then end of any Wii controller, there is a tiny infrared camera. This camera works with he Wii Sensor bar to help the Wii system determine exactly where your controller is. Now, using the Wii Camera Breakout Board you can easily harness the IR camera's power!
This breakout board will sense up to 4 separate points of IR/near IR light, and then outputs the X/Y position of each light, as well as the point's size and brightness. There are even mounting holes to easily attach your board to a servo.
Use this board to create a homing robot, or even your own basic motion sensing game. You can even use it to verify your sanity, as it will confirm your assertion that there are FOUR LIGHTS.
Requires 5V and 3.3V power
Camera senses up to 4 points of IR light