[sdiy] Duplex LED controller, was iPod click wheel

[Tim Parkhurst]

On 9/20/05, Metrophage <c0r3dump23 at yahoo.com> wrote:
>
> --- 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

 Found some very interesting info and application tips for using LEDs as
photodiodes
http://www.sensorsynergy.com/helpfulhints.htm
 And a paper that looks interesting, but is quite a 'heavy-duty' read
http://www.merl.com/reports/docs/TR2003-150.pdf

 Tim (light-duty) Servo
--
"Imagination is more important than knowledge." - Albert Einstein
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