Dan writes - "Saw the nifty capacitive sensor post... very cool stuff. We presented a cousin of this: led touch(less) sensing, at the make fair as part of our motestruments. Perhaps you and the makers would be interested in this very quick write up on how to get an LED to be both a light and a touch sensor." - Link.
Related:
Multi-Touch Sensing through LED Matrix Displays - Link.
Posted by Phillip Torrone |
Jun 2, 2006 11:48 AM
DIY Projects, Electronics |
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I would love to see more details on this idea geared towards us beginner makers :-) Could this be tied to relays and used as solid state switches in an area with changing light levels like a car?
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broken link
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just FYI, lots more info on leds as sensors here:
http://projects.dimension-x.net/technology-and-projects/ledsensors
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Link dead, it's on the wayback machine here though:
http://web.archive.org/web/20060720102458/http://motestruments.com/led-touch-sensor-circuit/
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From my understanding this works by sending a short burst of light and detecting it reflected back from a surface. This is quite easy when working with sound, but as light returns in just a few picoseconds, you have to 'buffer' the received signal perhaps with a good old capacitor.
I'm amazed of the multi-touch sensor as it might become the cheapest multi-touch sollution.
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