[sdiy] Accordion-style controller

[John Luciani]

On 2/11/07, Johannes Öberg <johannes.oberg at gmail.com> wrote:
> Hi list. I'm prospecting building a chromatic button accordion
> keyboard for MIDI. Does anybody have any recommendations for switches?
> It seems to me that the technically best idea would be to build little
> accordion levers that operate microswitches but that feels like
> overkill (and bloody difficult too!).

This may be in the overkill category as well but ...

You could add a feature to the lever to interrupt an opto beam.

I am retrofitting a couple of two octave pedal boards with slotted
opto-interrupters.
I have completed a PCB layout that contains the optos and a shift register.
The boards are easy to build and easy to attach to the back of the pedals.

I am using Fairchild MOC70P1 interrupters but there are probably
quite a few much smaller parts that would work better in your
application. The Fairchild parts are in the $0.50 - $1.00 range.

(* jcl *)




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