[sdiy] Duplex LED controller, was iPod click wheel

[Metrophage]

--- Sumanth Peddamatham <peddamat at gmail.com> wrote:

> If you are interested in an alternate, but equally cool haptic
> interface implementation, visit:
> http://mrl.nyu.edu/~jhan/ledtouch/index.html
> 
> I am trying to duplicate Jeff's effort using a few LEDs and a micro.

That appears to be very interesting to me! Thanks for the link,
Sumanth. I had no idea at all that LEDs also act like photodiodes. Also
I have never used photodiodes so I am not even familiar with their use.
Doing some web searching on this is slow going. One page I just found
mentions duplex LEDs for emitting and detecting, but it sounds like
they are talking about on fiber with a separate LED on either end.
< http://www.fiber-optics.info/articles/detector.htm >
 How does this work using an array which are all doing both functions?
I wonder if there is a current change when I put my fingers over LEDs.
Also I wonder what sort of LEDs work best for this sort of application.

Time for us to clone the Technos Acxel!
CJ


		
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