Multitouch table experiment

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By Phillip Torrone
Posted 2007/02/28 @ 11:55 am
Category Electronics

The tinker.it blog (and site) has tons of great projects for designers and artists, like this one a Multitouch table -

This is an experiment based on “frustrated total internal reflection” aka FTIR. This is a very basic demo and we did it just to see how it work and it took us just 4 days!

tinker.it Â» Blog Archive Â» multitouch table experiment – Link.

BY Phillip Torrone

Editor at large - Make magazine. Creative director - Adafruit Industries, contributing editor - Popular Science. Previously: Founded - Hack-a-Day, how-to editor - Engadget, Director of product development - Fallon Worldwide, Technology Director - Braincraft.

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5 Responses to Multitouch table experiment

DGary on February 28th, 2007 at 2:08 pm said:

saw a massive APR based touchscreen at an Industrial Design expo in Miami a few years back that I thought was the next big thing, kind of surprised APR didn’t take off more, since its just a few piezoelectric transducers and some signal processing and sample matching you could turn any sound transmitting surface into a touch screen

only downside of APR is it is based on sound, so it only works on touch, not drag, its like passive surface wave

although… I don’t see why surface wave couldn’t be used, same concept but with transmitters as well.

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charliex on February 28th, 2007 at 2:42 pm said:

I’m curious what happens if the plexiglass is scratched ?

the APR stuff looks interesting too, i wonder how resistant it is to external sounds.

http://www.elotouch.com/

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DGary on February 28th, 2007 at 3:08 pm said:

FTIR with a scratch should cause a “touch”, unless the application handling processing is written as to handle them, like an “alignment” of sorts

APR handles scratches very well, even seen some systems that could handle cracks although I imagine again, its more about signal processing and tuning than anything specific with the hardware design.

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Gajender on April 12th, 2007 at 4:14 am said:

i am very excited to khow that what will happen if plexiglass scratches.

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MaverickGizli on June 26th, 2007 at 5:35 am said:

i wonder how resistant it is to external sounds

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