Bread Modular

Bread Modular is an open-source hardware modular synthesizer format designed to be minimalistic and cost-effective.

Key Features

• Modular Design: Just like Eurorack
• USB-Powered: It can be portable
• Minimal Design: Cost Effective
• Modular MIDI Support: Use MIDI to communicate between modules (still supports CV & Gate)
• Analog and Digital Signal Paths: It’s your choice 
• Diverse Built-in Modules: Includes a wide range of pre-designed modules
• Configurable Digital Modules: Supports both voice and CV (uses AtTiny 1616 or ESP32)
• Fully Open Source: Including schematics, PCB designs, and code
• Ease of Customization: Enables straightforward creation of custom modules tailored to specific needs.
• No Case Required: Can be used directly on a breadboard or mounted on a simple base module.

KiCad workspace setup

Footprint libraries use a shared project-local table in opt/fp-lib-table, linked into every KiCad project. Workspace initialization copies existing local submodules instead of cloning them. See library setup and verification.

Table of Contents

• Specification
• Common Parts
• Modules
• Modular MIDI
• PCB Assembly
• KiCad → JLCPCB Export Tool — Gerber ZIP, BOM and pick-and-place CSV; no extra Python packages or plugins.

KiCad assembly export

python3 opt/kicad-jlcpcb/export.py modules/line_in

Requires Python and KiCad's built-in CLI. Add an LCSC field to symbols using KiCad's native Symbol Properties / Symbol Fields Table to include catalog part numbers. See the tool documentation for requirements, field setup and export options.