[sdiy] Diode Matrix Keyboard Circuits?

[HA.Synth at t-online.de]

Hi Dave,

i see my answer was to short. I plan to do a similar thing. I have an old
keyboard with single contacts from kimber allen. I want to turn it in an
polykeyboard with up to ten analog outputs. Here is the way i go:

I have bought the scanner hardware (PCB's "organ scan" in my case, you need
"matrix scan") for the keyboard scan from them. Now i'll have a look at their
firmware. Extract the scanner part and turn it in AVR (i have an stk500 from
atmel) code. Leave the midi part out. Then the scaner part is done.

Generating the analog output is up to you

Harald

 Am Donnerstag, 7. Dezember 2006 18:51 schrieb DSL FODA01:
> Hello Harald,
>
> Thank you for the reference.  I took a look at that web page, but I had a
> hard time understanding it, even using an online translation program
> (Babelfish).  From what I could understand, it seems to me as though they
> are working with MIDI.  I am looking for a way to bypass MIDI altogether
> and go right from a matrix-keyboard to CV/Gate/Trigger output.  If I am
> mistaken, please let me know.  I have a 16F877A which could give analog
> outputs via PWM but I have yet to learn how to program it ;-)
>
> thanks sincerely,
>
> Dave
>
>
> ----- Original Message -----
> From: <HA.Synth at t-online.de>
> To: "DSL FODA01" <foda01 at epix.net>; "Synth DIY"
> <synth-diy at dropmix.xs4all.nl>
> Sent: Thursday, December 07, 2006 10:44 AM
> Subject: Re: [sdiy] Diode Matrix Keyboard Circuits?
>
> > Hi Dave,
> >
> > look at this: http://www.heise.de/ct/Redaktion/cm/klangcomputer/
> > Sorry its German, but they sell the PCBs you need and you can download
> > the firmware there.
> >
> > Harald
> >
> > Am Donnerstag, 7. Dezember 2006 04:56 schrieb DSL FODA01:
> > > Hi all,
> > >
> > > Does anyone here know of a good way to create a scanner circuit for a
>
> diode
>
> > > matrix keyboard?  I have a 49 key Yamaha keyboard here that already has
>
> a
>
> > > diode matrix type of board on it and I would like to use it to generate
> > > CV/Trig/Gate outputs.  I think a PIC or something like that would be
>
> best
>
> > > but unfortunately I don't yet have a high enough skill at low-level
> > > programming.  I have seen some designs in hardware, but the only board
> > > I saw (Ray Wilson's) is discontinued.  Any other suggestions?
> > >
> > > Dave

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