Using a Nintendo Wii Remote (Wiimote) and a projector you can turn any surface into an interactive musical DJ tool. This video demonstrates algoriddim's Mac DJ software "djay" — http://www.djay-software.com — on a MacBook Pro, projected onto a glass table.
I used an IR light source strapped to my finger with a push button switch to activate mouse clicks. The wiimote can track the position of my finger using Johnny Lee's famous Wiimote software: http://www.cs.cmu.edu/~johnny/projects/wii/
A Mac version of this tool, which I used in this demo, "WiimoteWhiteboard" can be downloaded at: http://www.uweschmidt.org/wiimote-whiteboard
More info at http://www.joelsadler.net/Ideablog/IdeaBlog/Entries/2008/2/27_Low_Cost_Intera...
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