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 Forum index » DIY Hardware and Software » Musical Interfaces
CV to MIDI preferably DIY
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hububalli



Joined: Feb 15, 2014
Posts: 39
Location: UK

PostPosted: Sat Feb 23, 2019 12:25 pm    Post subject: CV to MIDI preferably DIY Reply with quote  Mark this post and the followings unread

Does anyone know of a (preferably) DIY means of getting MIDI out of my modular? I have a couple of USB/MIDI to CV modules but cant find anything that provides an output.

I am trying to sync a JP-8000 via MIDI.

Thanks,
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JovianPyx



Joined: Nov 20, 2007
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PostPosted: Sat Feb 23, 2019 1:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

There are certainly commercial ones available, so it is possible to do. Google "CV to MIDI converter". Kenton Pro shows up.

As for DIY - That will require a microprocessor that has a decent ADC (the more bits the better). You would probably have to program the microprocessor yourself, unless you can find such a project on the web where all of the code is published. It involves using the ADC to convert a pitch CV to a number, then that number is converted to a MIDI note number and finally the system would output a MIDI message when a gate or trigger is received.

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RingMad



Joined: Jan 15, 2011
Posts: 384
Location: Montreal, Canada
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PostPosted: Sun Feb 24, 2019 7:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

I built an Arduino-based expression pedal to MIDI box for a friend using the info and code here: https://www.codeproject.com/Articles/38203/Arduino-Based-MIDI-Expression-Pedal

More generally, this box converts a voltage into a MIDI message just like JovianPyx described. (An expression pedal is just a pot wired as a voltage divider, producing a voltage).

I actually had 2 separate inputs, and each CV was sent on a separate MIDI channel. So it's possible to handle several CVs at once.

There might be better or cheaper ways to do it, it's just what I came across first when my friend asked for one.

.:james:.
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hububalli



Joined: Feb 15, 2014
Posts: 39
Location: UK

PostPosted: Mon Feb 25, 2019 1:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the replies. I did some more searching after your suggestions and found a couple of old projects out there that achieved this.

One mentioned was by a guy called Tom Scarff. Unfortunately his website no longer exists but I have managed to find some information using web.archive.org.

Thanks for that link RingMad, was quite an interesting article and a possibility. I would have to figure out how you would map discreet voltages to MIDI.
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gabbagabi



Joined: Nov 29, 2008
Posts: 526
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PostPosted: Tue Feb 26, 2019 2:10 am    Post subject: Reply with quote  Mark this post and the followings unread

may consider this?
https://obsoletetechnology.wordpress.com/projects/cv-gate-to-midi-converter/
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cslammy



Joined: Apr 27, 2018
Posts: 128
Location: USA

PostPosted: Thu May 09, 2019 6:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

I hate advocating "don't it Yourself", but....I've been considering building the same thing (from quick reading it looks not too terribly hard with Arduino, especially if you can hard code midi channels and CC output #'s and leave out CV V/oct to MIDI) but then I saw the price of Kenton's CV to MIDI. It's pretty affordable considering how many hours it'd take to do this right, the way Kenton does.....I got one slightly used on Reverb for maybe $125 and it rules. Sorry, wimped out here.
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