MIDI to CV with Arduino (Hagiwo)

[Dud]

Another Arduino project from Hagiwo

DIY eurorack modular synth MIDI to CV with Arduino MIDI library / switched on bach BWV846

“My 11th original eurorack modular synth DIY projects with arduino. Converts MIDI output to CV output from novation circuit or arturia keystep. I am planning to make a stand-alone synthesizer using YAMAHA’s PCM sound source IC, and I had to learn MIDI control for that. Already there are great open source modules like MIDI2CV , but I had to reinvent the wheel to learn MIDI. This time, I learned how to control MIDI with Arduino by making my own MIDI to CV module.”

working documents ( Source code )

700円で作るGATE BURST/DELAYモジュール-モジュラーシンセ自作｜HAGIWO/ハギヲ｜note

Link to MIDI2CV (It’s a great product that I was inspired.)

GitHub - elkayem/midi2cv: Arduino-based MIDI to CV converter

[ $8 ] DIY eurorack modular synth MIDI to CV with Arduino MIDI library / switched on bach BWV846

[analogoutput]

@HAGIWO writes there:

Also, since serial communication with the PC is not possible, the serial monitor of the Arduino IDE cannot be used either.
(Maybe there is a workaround)

One workaround is to use the SoftwareSerial library for MIDI, freeing up the hardware serial for the serial monitor. Unfortunately SoftwareSerial is too slow for MIDI when using a sequencer or the like, but it could be used to debug with single key presses. Then switch to hardware serial when done debugging.

Another workaround is to use an OLED display for diagnostic messages.

See:

Garbage in my MIDI

I’ve breadboarded a MIDI in circuit with a Nano and am running a sketch that listens for MIDI messages and prints them out. It uses SoftwareSerial for MIDI so it can write diagnostics to the serial monitor with hardware serial. Or it can be set up to use hardware serial for MIDI and write no diagnostics; it flashes an LED when it sees a MIDI message of the type or types I specify. And I’m getting garbage. I’m using this for MIDI In: [image] The worse problem is with the Arturia Keystep. If …

[analogoutput]

@HAGIWO, your schematic shows the MIDI jack connected to ground. This is incorrect. See:

from

DIY Midi to Trigger interface? Arduino?

It depends on the midi spec. As of 1.1, the signaling was changed to include 3.3v. Whats really important is the current loop at 5mA so resistors would need to change for 3.3v implementations. With 5v, you’d use a pair of 220Ω resistors, but 3.3v uses 3Ω and 10Ω resistors. Additionally, MIDI out does not require an optocoupler. [MIDI OUT Circuit] [MIDI IN_THROUGH Circuit]