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The midi decoder is used to receive NoteON
The midi decoder is used to receive NoteON In the first project I limited myself to only one Arduino UNO. The decoder had 18 outputs and was to light up LED indicators for stops switches in GrandOrgue or Hauptwerk. He responded to NoteOn and NotteOff messages on any channel. The first attempts looked like this:
Then I added shift registers, and buffers 2803 and the decoder obtained 70 outputs for controlling Led-s or electromagnets.