Ogham
A dual-voice bytebeat synthesizer for Eurorack, built on the Electro-Smith Daisy Seed. This repository holds everything needed to build one: firmware source, schematics, PCB, panel, and the fabrication package.
Instead of oscillators and wavetables, Ogham runs bytebeat expressions — single lines of integer arithmetic that, evaluated over time, produce surprisingly rich rhythmic and melodic patterns. It hosts a bank of them, plays two at once, and clocks, pitches and modulates them from the rest of your rack.
- Manual: https://keeos.io/docs/ogham-manual/ (or
docs/ogham-manual.pdf) - Firmware downloads and changelog: https://keeos.io/firmware/ogham/
- Module overview: https://keeos.io/modules/ogham/
Status: prototype. Built and tested on a handful of units, not qualified for production. Published so others can learn from it and build on it. Check the design yourself before you commit money to a fab run.
What's here
| Path | Contents |
|---|---|
firmware/ | Firmware source, build and flashing instructions |
hardware/ogham-merged-v1.0/ | KiCad schematics and PCB — the shipping revision |
hardware/panel/ | Front panel: artwork, and the panel PCB project |
hardware/production/ | Gerbers, BOM, placement — ready to upload to a fab |
docs/ | Build instructions, and the manual as a PDF |
lib/ | libDaisy and DaisySP, as pinned submodules |
Only the current board revision is published. Earlier prototypes are not included, so there is nothing here to fabricate by mistake.
Quick start
To build the firmware — docs/BUILDING.md has the full
set-up for Windows, macOS and Linux; firmware/README.md
covers the firmware itself. In short:
git clone --recurse-submodules https://github.com/keeos-io/ogham.git
cd ogham && make -C lib/libDaisy -j8 && make -C lib/DaisySP -j8
cd firmware && make -j8
--recurse-submodules is not optional: libDaisy has nested submodules of its
own, and without them the build fails part-way with a missing HAL object.
To have the boards made — see hardware/README.md.
Upload hardware/production/ogham-merged-v1.0.zip, and read the
hand-populate list first: several parts are deliberately excluded from
assembly and a board built from the BOM alone will be missing them.
Licensing
Firmware is MIT. Hardware and documentation are CC BY-SA 4.0. Build one, sell one, fork it — but share hardware modifications alike, and give credit. The Keeos name and the panel identity are not covered.
Full terms in LICENSE.md; third-party components and the panel
typefaces in THIRD-PARTY.md.
A note on reproducible builds
The published binaries are byte-for-byte reproducible from this repository.
Building the firmware at a given tag, with the submodules at their pinned
commits and Arm GNU Toolchain 14.2.Rel1, reproduces the exact .bin shipped
for that release — verified, not assumed.
Two things will break that: building against a different libDaisy commit, or a different compiler version. Both produce working firmware; neither reproduces the published checksums. If you are verifying a download rather than developing, compare against the SHA-256 published with each release.