3.3V serial MIDI Thru #MIDI #RaspberryPi

The Simple DIY Electronic Music Projects writes:

I have a need to route MIDI to several Raspberry Pi boards at the same time, so I’ve hacked together a variant of my MIDI Matrix Patch Bay to give me a 3.3V level serial MIDI THRU interface.

The INPUT board for my MIDI patch bay gives two MIDI INPUT channels, each broken out to 10 MIDI THRU channels. In my case I just want a single channel so will be using half of the INPUT board and the power supply section.

But as I want to provide a direct serial link to a Raspberry Pi, I need two things:

• I don’t need a full MIDI OUT stage, so will be taking the IO level directly from the 74HC14 inverters.
• I need it to work with 3V3 logic voltage levels.

See the video below and more in the post here.