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TOPIC: MIDIfication of a Viscount Domus 4

MIDIfication of a Viscount Domus 4 6 months 1 day ago #130

  • lanu
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Hello,
I started to midify an old analog Domus 4, using a A20 Olinuxino MICRO. I would have some question / looking for some advices regarding some choices.

First, a remind of the electrical characteristics of its keyboards (2x 56-note keyboard + 27-note pedal) :




I plan to simply build 5 board of diodes according to the following schematics :


Then the software have to alternatively enable one keyboard at a time and read the of the corresponding keyboard.
So, on both GPIO-3 and GPIO-2, I need to use 3 outputs and 28 inputs.

What do think about this architecture ? I currently face some problem to be able to access all the pin on GPIO-3 (pins PH11, PB14, PB15, PB17 remain high despite cleaning the .dts configuration).
Jest lukratywne nie księgowość online tylko na rzecz porządnych firmie aliści również w celu symbolicznych natomiast rozpoczynających przemysłowców Wiesz że bezpośrednio dg.
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