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Firmware

CHOMPI

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All of the production files, hardware and firmware, that make up the CHOMPI Sampler.

CHOMPI is custom firmware for the CHOMPI Club CHOMPI, by @ugrossek. Open source under MIT, latest release circles-1.0 (November 2026), 1 star on GitHub.

forCHOMPI Club CHOMPI·by@ugrossek

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MIT· ugrossek/CHOMPI·downloads come from the creator’s GitHub releases

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CHOMPI — Open Source

This fork: TAPE with speed-independent pitch

An experimental TAPE build where changing a voice's pitch no longer changes its playback speed. Details, build notes and known limits are in firmware/chompi-tape.

Download the firmware — a ready-to-flash .bin, with install steps.

This is not an official CHOMPI Club release. Everything below is their original README.

Use at your own risk. This is unofficial software provided as-is, with no warranty, and it has only been tested on one unit. It is loaded from the SD card like any firmware update and never touches the bootloader.

CHOMPI is a quirky chromatic sampler and tape-music instrument by CHOMPI Club.

This repo contains all of the production files, both hardware and firmware, that make up the CHOMPI Sampler.

What's here

Firmware — Start HereQuick instructions for setting up your development environment, building the firmware, and loading it onto your CHOMPI.
firmware/chompi-waveWAVE 1.0, a wavetable synth firmware that doubles as a starting point for anyone writing their own firmware.
firmware/chompi-tempoTEMPO 1.0, a pattern generator firmware — the counterpart to TAPE.
firmware/chompi-tapeTAPE 2.0, the sampler firmware every CHOMPI ships with.
firmware/chompi-bootloader-v6.4-betaThis bootloader never shipped on units, but was created to improve stability of the Daisy Seed's integration with CHOMPI's hardware as well as repair edge-case issues related to bugs inherited from older versions of the Electrosmith bootloader.
firmware/card-profilesThe factory microSD card contents for TAPE, TEMPO and WAVE — firmware, samples and settings.
hardware/hardware-pcbSchematic, BOM, EAGLE PCB files, and the full fabrication package.
hardware/hardware-enclosureThe six pcb panel enclosure files, as well as laser cutting files for diy panels.

Each folder contains its own README, so check those out for more details.

What's not here

The panel artwork. The graphic set and CHOMPI logos have all been removed for copyright purposes. If you choose to create your own hardware, we ask that you name it something else to avoid trademark infringement.

Support Guidelines

This is a discontinuation open-source release. As such, this repo is intended to be a permanent source for files and documentation, and will likely not be receiving updates in the future. If you wish to customize your own project, we recommend cloning this repo into your own GitHub.

Community

Even though this version of CHOMPI is now discontinued, the CLUB is expanding. If you want to discuss this project, share your creations, see what other users have made on their CHOMPI, feel free to check out the CHOMPI Open Source channel on the Chase Bliss Discord.

License

Everything here is MIT — see LICENSE. THIRD_PARTY.md lists the work this builds on and the notices that come with it. The CHOMPI name, logo and artwork are not covered by the license — see TRADEMARKS.md.

HAPPY CHOMPIN'