An open source platform for building pedalboard components — MIDI foot controllers and audio processing for guitar effects.
- Fully open source hardware and software (CERN-OHL-P-2.0)
- Modular: MIDI-only or combined MIDI + audio
- Independent MIDI controller with instant startup — audio issues don't affect MIDI
- Maker friendly: common components, existing modules
- Flat design: 30mm case height target
- Built for live performance, not a playground
Please join us on the community Discord server.
The hardware architecture is modular. Two independent processors handle MIDI and audio processing, connected over USB-MIDI.
| Component | Description | Image |
|---|---|---|
| Main Board | CM4/CM5 carrier, RP-2040 MIDI controller, 6 buttons, 2 encoders |  |
| Display Board | 8 RGB LED rings + 2 OLED display ports |  |
| Sound Card | I²S audio codec HAT — PCM1863 ADC (106dB SNR) + PCM5242 DAC (112dB) |  |
| RGB LED Ring | RGB LED ring around foot button | |
| Mechanical Parts | 3D printable case and mounting parts |
| Component | Description |
|---|---|
| MIDI Firmware | RP-2040 firmware (Rust) for MIDI control |
| ELK Audio OS | Real-time audio processing on CM4/CM5 |
| top view | rear view |
|---|---|
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- KiCad — PCB design
- OpenSCAD — 3D printable parts
- LumenPnP — PCB assembly
- Rust — MIDI controller firmware
- ELK Audio OS — real-time audio