https://github.com/edwardsharp/midi2cv

some modular hardware musingz
https://github.com/edwardsharp/midi2cv

Last synced: 28 days ago
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some modular hardware musingz

• Host: GitHub
• URL: https://github.com/edwardsharp/midi2cv
• Owner: edwardsharp
• Created: 2024-07-29T16:52:03.000Z (6 months ago)
• Default Branch: main
• Last Pushed: 2024-08-13T10:41:56.000Z (5 months ago)
• Last Synced: 2024-08-13T20:51:13.055Z (5 months ago)
• Language: C++
• Size: 6.14 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

        
# MIDI2CV

just some musing on a midi to cv (control voltage) converter for eurorack.

this is the code for the second revision. which uses usb midi!

there's 4 mcp4728 DACs that provide 16 channels of control voltages (0-5v). 8 of those are for notes, the other 8 are for note velocities, and the other 8 are gates (the gates and leds are controlled via a [74HC595 shift register](https://www.adafruit.com/product/450)). there's a usb midi interface which uses [adafruit's rp2040 with usb host board](https://learn.adafruit.com/assets/120411). the [EZ_USB_MIDI_HOST](https://github.com/rppicomidi/EZ_USB_MIDI_HOST/) handles usb midi and uses the [sekigon-gonnoc/Pico-PIO-USB](https://github.com/sekigon-gonnoc/Pico-PIO-USB) library (programmable input/output) as a [bit-bangin'](https://en.wikipedia.org/wiki/Bit_banging) software usb host controller.

**IMPORTANT NOTE:** i ended up using v`0.5.3` of this library because the newest version (v`0.6.0` at the time of writing this) was very unstable [read more in this github issue](https://github.com/sekigon-gonnoc/Pico-PIO-USB/issues/122).

i also ran into another dead end where my rp2040 would crash when sending i2c data to more than one mcp4728 DAC so i used another rp2040 (a [kb2040](https://learn.adafruit.com/assets/106984), that adafruit sent me as a freebie) to do the i2c communication with the DACs and use serial UART between the two rp2040s. :feelsgood:

_so please note:_

1. `midi2` is the arduino sketch for the [rp2040 with usb host](https://www.adafruit.com/product/5723)

2. `2cv` is the arduino sketch for the [kb2040](https://www.adafruit.com/product/5302)

![midi2cv prototype](midi2cv.png)

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made with 🖤 in NYC