Low-Cost Multi-touch Whiteboard using the Wii Remote

This is absolutely super-cool amazing! In this YouTube video a fellow named Johnny Chung Lee at Carnegie Mellon University shows how to use a Wii Remote to create a light pen based touch screen white board. He also shows how to apply the same technique to a regular computer screen. I can see manufacturers coming out with a $100 version of this for any computer in the near future.

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