[sdiy] Aftertouch strip

[Ian Fritz]

At 07:41 PM 11/28/2006, Richard Wentk wrote:

>I'm considering an optical solution, but the keybed deflection is
>only around 1mm, so the available brightness variation that could be
>turned into a signal is quite small.

I use optical detection of a 1 mm deflection in one of my electronic 
mouthpiece circuits:
http://home.earthlink.net/~ijfritz/st_cir6.htm

Nowadays, however, I prefer using a magnet / linear Hall sensor for 
position sensing:
http://home.earthlink.net/~ijfritz/sos_cir3.htm
http://home.earthlink.net/~ijfritz/sos_cir4.htm

   Ian