[ $8 ] 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 )
note.com/solder_state/n/n17e0...
Please support me to continue projects.
/ hagiwo
linc to MIDI2CV(It's a great product that I was inspired.)
github.com/elkayem/midi2cv
Using instrument as MIDI source.
-ARTURIA KEYSTEP
-NOVATION CIRCUIT
-USB to MIDI converter (Chinese no brand)
-------------------------------------------------------------
My other DIY modular synth movie.
$7 6CH gate sequencer with OLED
• [ $7 ] DIY eurorack mo...
$35 YAMAHA FM VCO
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$7 Samplar
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$8 Quantizer with TB-303 type slide function
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$8 VCF Gakken SX-150 type
• [ $8 ] DIY eurorack mo...
$7 Generative sequencer
• [ $7 ] DIY eurorack mo...
$8 Envelope generator
• [ $8 ] DIY eurorack mo...
$20 DSP effect module:
• DIY modular synth / $2...
$10 EQ module.
• DIY modular synth / $1...
$7 LFO&VCO module
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$6 Gate Delay and Burst
• [ $6 ] DIY eurorack mo...
$6 Clock multiple & divider
• [ $6 ] DIY eurorack mo...

[@federico8918]

Your collection of diy modules is awesome! I'm planning on building the quantizer. Keep up the good work!

[@MarneusAndMilkyBlood]

Super cool! I really gotta start building some of these!

[@thnknde]

Beautiful! Best DIY eurorack content on the internet!

[@Faustomujica]

This is nuts! Great job!

[@romanopekushin3099]

Great job. Good luck and new ideas.

[@OIP_1]

fantastic! i only have a MCP4921 so will try with just the CV channel. thanks so much!

[@JacobChrist]

私は好きです。日本語とエレクトロニクスとおんがくが勉強います。 I love your video. I study Japanese, electronics and music.

[@Instrumentals4Sale]

Kudos for the sakamoto riffs :)

[@mymodularjourney]

Great work again!

[@MrGuillermofrancisco]

full support!! love your stuff. thanks

[@normdurkin6425]

..how are you building his modules without reading Japanese..? ..unfortunately I only understand English.. thank you for your help..

[@thnknde]

@@normdurkin6425 google translate

[@MrGuillermofrancisco]

@@normdurkin6425 reading the arduino code and looking at the schematic ... and testing, and of course translating the language

[@oraszuletik]

Köszönjük!

[@kubacukier]

Great project

[@jerrycashman4939]

Thank you so much for making these designs available - very much appreciated! I'm building the Midi-CV module at the moment, taking it slow trying to learn. I have a question if you have a moment - on the output jacks from the Arduino (D4/D5) and the outputs from the DAC (OutA,OutB) there is a little structure of two diodes, one to ground, one to +5v - I'm wondering what that setup does for the circuit please?

[@kostas8018]

This is a great project but the prices mentioned are much lower than what the parts actually cost in most countries. In my country in Europe, I was able to get most material for a total of EUR 16.90 (about $18.20) without counting the small things (stripboard, screws, wires, etc), or postage. Your work is very helpful for everyone doing DIY but I thought I should mention that the cost of building this is likely to be at least 2x!

[@HAGIWO]

I buy most of the components for my modules from aliexpress and tayda electronics. It takes longer to transport, but I can get the components very inexpensively. Thank you!

[@alanbrito13]

amazing

[@tomfenn7149]

Hagiwo, you ARE Isao Tomita reincarnated! 8-)

[@kalubandali2241]

You Legend!

[@gt3kstudios]

YELLOW MAGIC ORCHESTRA..

[@TobaTobias]

Great stuff! A fan of your work. I am wondering if there are alternatives to the Schottky Diodes you use? Can't seem to find them in my country. Cheers!

[@HAGIWO]

If the parameter Vf in the data sheet is about 0.3V, it doesn't matter which SBD you use.A normal diode cannot be used because Vf is too large at 0.6V. Thank you!

[@-______-______-]

Beautiful build. Thank you. 🙏 I have a question: If I wanted to control the LFO (rate) in my tremolo circuit, do I only need a midi2cv module? Can this unit take some kind of midi signal which it converts to a pulsating frequency like an LFO, or do I need an additional separate LFO module with CV input AFTER a Midi2CV module? I'm a little bit lost at the moment trying to understand the concept fully, before I make these modules for that purpose? I'm trying to somehow output a midi rhythm/pattern from my DAW to sync the Rate of my tremolo circuit. Thank you.

[@errishumain]

Just for the Sakamoto cover

[@12aipom34]

Hello great video, which pin on the DAC does "MOSI" refer to in the documentation? Thank you

[@HAGIWO]

MOSI refers to SDI and MISO refers to SDO.

[@woosix7735]

Is that a witergatan song in the beginning?

[@bassfreak3840]

question, the gate seems to be delayed click going from off to on to off which doesnt sound right on when modulating level for vca, any way i can fix this? kindof sounds like what you have at the beginning

[@user-hw4zg8fh3k]

Really cool project! How is it possible to get 3 voices from 1 MIDI input? I'm really noobie at coding. I know how to create schematic (add more MCP in empty outputs), but how to realize it in code?

[@HAGIWO]

3voice requires major changes to the circuit and source code. I don't think the basic part of the design will change, so please try to modify it.

[@raycodes7393]

@HAGIWO can you also make a USB MIDI to CV converter for controllers like Akai MPK mini mk3. The MPK mini mk3 only has USB output and needs power from the host Love your vids!

[@iOlifer]

As I know, akai's mk3 midi (usb port) can be transformed to traditional midi by usb host (like Doremidi or something else)

[@marianoml7439]

I'm planning to make the midi2cv to use my launchkey novation with a MFOS Noise toaster that also i want to make. Do you have the design of the PCB that you are using in your project?

[@HAGIWO]

There are no PCBs in this project. The linked project has PCB data. The functions are similar, so please refer to it. kzbin.info/www/bejne/l4G4p3maosxpm68

[@BrennBow]

Hello what pins on the mcp4922 are connected to D10 & D13 on the arduino? Where can I find/download the arduino sketch code please? Thanks.

[@guysmiley7289]

What is the limit on CV jacks you can do with this method?

[@ramirofernandez6079]

Hello! I wanted to ask you if I could use a sequencer in ableton that sends v/oct signal to the rack. If it it’s possible how would you do it?

[@HAGIWO]

It requires some code changes. You can link to Ableton by using the MIDI reception value of Control Change (CC).

[@Vitaminah3pcmNet]

Hi, this is a great project. I want to ask about the connection of the MCP4922. Should VREFA and VFERB be connected to 5V, or just VREFA? Thanks for the clarification.

[@HAGIWO]

Please connect VREFA and VREFB to 5V.

[@Vitaminah3pcmNet]

Thank you very much :) @@HAGIWO

[@Alejandro-kz2zf]

As usual, amazing project. Could the code be changed so it delivers exponential CV instead of linear? Ty!

[@Alejandro-kz2zf]

I think the CV increments are defined here? "// V/OCT LSB for DAC"

[@HAGIWO]

If you want to change the CV of the scale, edit // V / OCT LSB for DAC. For the CV of the modulation wheel, change the formula of case midi :: PitchBend :. Thank you.

[@cristianfrccc]

Dear, I would can use arduino uno with this program? change pin11 for 12 (miso) and 13 for CV and 4 & 5 for gate and clock. and photo coupler TLP 785 for PC817?

[@HAGIWO]

I think it works with UNO. The photocoupler works even with general-purpose ones.

[@Vitaminah3pcmNet]

Hi, I tried your circuit and unfortunately it doesn't work for me. I found that the midi signal goes through the optocoupler fine, but when the RX pin of the arduino is connected to the optocoupler output, the signal is distorted, the pulses no longer reach a value close to 0V, but about 3V. The logical signal will thus disappear. I used the same parts as you. Do you know where the problem could be please?

[@-______-______-]

Did you ever sort this out?

[@MrDonrecardo]

I would like to build this but one thing puzzles me , on the circuit diagram it shows 5V conected to Vdd and Vref on the DAC, but is that Vref A Vref B or both ?

[@HAGIWO]

5V is connected to both.Thank you!

[@MrDonrecardo]

@@HAGIWO great thank you

[@TobaTobias]

Hey there! Did you manage to unravel to what pins the arduino d10 and d11 are going to?

[@MrDonrecardo]

@@TobaTobias yes. Both ref pins

[@myblues]

just took a quick look at the schematic; Is this thing vactrol controlled?

[@HAGIWO]

The vactrol (to be exact, a photocoupler) functions as a switch for safely inputting MIDI signals.

[@IvanMartinezHernandez]

How can I add more ControlChange outputs? I try to understand the code but I can't understand that part

[@HAGIWO]

With the PWM output of the Arduino, I believe the MIDI CC can be added with a small circuit change and code modification.

[@_epe2590]

Do you add the voltage that the pitch bend would produce to the cv output voltage?

[@HAGIWO]

It would not be difficult to add pitch bend functionality by modifying the source code. It is just a matter of reading the MIDI CC of the pitch bend and reflecting it in the output voltage.

[@_epe2590]

@@HAGIWO one more question: how do you compensate for the fact that the arduino nano might not spit out exactly 5v. mine read 5.06. Wouldn't that make it so each not is not exactly 0.083v?

[@raxim4119]

can input cv from vco 15v?

[@ivanmartinez3688]

Can I use the MCP4728?

[@HAGIWO]

SPI and I2C are different communication methods in MCP4728. If you modify the circuit and source code, I think you can use MCP4728.

[@thnknde]

Have you considered a cv to midi / USB module?

[@HAGIWO]

I plan to challenge in the near future. The problem is that the difficulty level changes depending on whether or not the USB host function is provided.

[@thnknde]

@@HAGIWO Oh yes of course, that is precarious. I never see them really and I thought it was strange!

[@romanopekushin3099]

Great job. Good luck to you. New ideas.