BulkyMIDI-32 Channel Monitor

It's a BulkyMIDI-32 MIDI tower, the two bottom modules are two different designs for channel monitors. The top one was based on a 90s design from an article by W. Dunczewski implemented only with logic chips, the bottom one I created using an Arduino Pro Micro instead. As you can probably hear and briefly see, the music is coming from Monkey Island 2 running on ScummVM.
github.com/teb...

[@retroandgaming]

Nice! Do you have a write-up on the channel monitor using the Arduino? I'm building my own MIDI mountain and this would be a nice addition :)

[@TEBLify]

I seem to have fallen a bit behind on documenting things, but the schematic (github.com/tebl/BulkyMIDI-32/blob/main/documentation/schematic/BulkyMIDI-32%20Channel%202.pdf) and source code is available (github.com/tebl/BulkyMIDI-32/tree/main/software/arduino/ChannelMonitor).
The circuit is pretty simple as it uses ready-made libraries to decode the messages, I used a Pro Micro in particular since it has an extra HW UART as I find that works better. Could probably simplify the LEDs to skip the transistors, I just had that from copying the first channel monitor schematic.