Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Winterbloom Castor & Pollux

Castor & Pollux is a Roland Juno-inspired oscillator in Eurorack format.

More details available at

Repository layout

This repository contains the hardware design files, firmware files, factory setup scripts, and user guide for Castor & Pollux.

  • factory/ contains the scripts used to program, test, and calibrate the module after assembly. These scripts are all written in Python.
  • firmware/ contains the firmware source code, build scripts, and third-party dependencies. The firmware is written in C using GCC ARM.
  • hardware/ contains the hardware design files for the mainboard, jackboard, panel, and programming board. These are all created using KiCAD.
  • user_guide/ contains the user's guide source files. These are written in Markdown and published using MkDocs.

License and contributing

Castor & Pollux is open-source hardware and software, however, licensing a project like this is a little complicated. Please take a chance to review the LICENSE file.

We welcome contributions! Please read our Contributing Guide and Code of Conduct.