$2 multi-touch PC interface

This el-cheap-o multi-tiouch interface was posted today on HackedGadgets. It uses a plastic bag, blue dye and a web cam. The web cam is used to differentiate between normal blue color and the bright spots created when the top of the bag is deflected. This deflection is translate that to an X-Y coordinate on the screen.

It looks like the setup has to be used in bright sun light so the pressure on the bag will create a bright spot. Some LEDs on the edge of the bag might work, give it a try!

Very cool and interesting way to get a multi-touch interface for a PC.


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