Using an IR led array and some reflective tape, you can track fingers in thin air using the Wii Remote by Johnny Chung Lee, Carnegie Mellon University. The grid software is a custom program written using a C# wiimote library and DirectX. More information about the grid software can be found at http://www.cs.cmu.edu/~johnny/projects/wii/
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they make me happy every time i find one.
now i wanna go play wii baseball
i wonder who is this work anyway?