Here’s a really awesome multi-touch hack that shows you how to make your own multi-touch LCD with some LEDs.
Flat multitouch LCD monitor which only uses light emitting diodes as optical sensor elements. The sensor resolution is 48 × 32 LEDs. Instead of the high number of LEDs the power consumption is about 3W at a frame rate of 10 Hz.
video://www.youtube.com/watch?v=BiJsBaBAUL4
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