midi2usbhost
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rppicomidi
Add CV and Gate
A lot of Synths and all modular systems use a 1V/octave control voltage for pitch, and a gate signal (low/high = note off/on). It would be great to be able to use this project to control such synths or add CV/Gate outputs to MIDI keyboards. This can be done by PWM and filters or a DAC such as the MCP4725 (I2C) for a better signal. in general, a semitone is 83.33 milivolts (0.08333 V)
@JustBKen That is a good idea for a project, but it is out of scope for this one. The intent of this project is to do just 5-pin DIN MIDI to USB Host so it is easier to understand and to build. MIDI to CV conversion is on my list of projects I want to do. I will get to it one day. I hope this project is still useful to you. Many analog synthesizers also have a MIDI IN connector, and some will even convert that MIDI IN to a CV and Gate output.
I guess mine is a nieche case. I am currently building a synth around a monotron duo inspired by the ms-20. Since the monotrons only have CV/Gate and no MIDI, i want to add a method to use my MIDI keyboard on it without using 2 microprocessors. Your project is the only one I found acting as a USB-MIDI host. Do you have any tipps on how I could modify your code to achieve midi note to Pitch CV. Even a pointer to where to get the midi data in the code would be helpful!
Update: I figured it out, I think. I will do some testing once finished with the synth and post a fork if you would allow that. I could also just share the code with you
@JustBKen Sorry I didn't get back to you sooner. The application is cool. There a whole commercial projects that do what you are doing. I am glad you figured it out.
In my mind, it really shouldn't be a fork of this project called midi2usbhost. It is a different project altogether, perhaps usb-midi-host2cv or something like that. I might suggest that instead of just sharing your code with me, you should create a new repository and share it with everyone in your own github page. After all, you did the work. Post a link in this issue when it is ready. I will keep this issue open so I and others can find it.
I shall do so, once I am finished and have fully tested it. Thank you for the permission and encouragement!