The following is a nice TED talk which demonstrates an wii remote hacking idea which extends the functionality beyond gaming. The speaker developed a freely downloadable software (his website) which uses the infrared sensing capabilities of the wii. In the talk he demonstrates few applications of the basic idea. He shows a infrared pen which uses the screen projection as white board. In another application, with two infrared devices, he creates two touch points which can be used as a multi-touch interface. But the best part is that the infrared device when attached to the head can be used as a head tracking device. The 3D projection keeps changing according to the position of the viewer head.
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