780 open source PCB designs, indexed by the chip they’re built around
Real boards from 256 public GitHub repositories, read straight from their KiCad files: size, layers, the full parts list and a render of the PCB. Find one close to what you’re building, then simulate its firmware on HardLabs before you order anything.
STM32Multistepper
eddyem
113.5 × 105.5 mm234 parts4LNo license206
STM32MicroRusEFI
rusefi
80.6 × 93.7 mm238 parts2LNo license97
STM32Shirley-FC-Dev-Board
Bare-Metal-Foundry
56 × 46 mm110 parts4LNo license29
STM32Main
wgbowley
60 × 40 mm59 parts2LMIT8- schematic only · 9 partsSTM32
MetaForge
FidelOdok
9 partsCustom license8 
STM32VESC Controller
paltatech
160 × 90 mm336 parts4LNo license354
STM32Nitrogen
80 × 80 mm136 parts4LNo license206
STM32Sun sensor test
rgw3d
132.7 × 37.3 mm151 parts2LGPL-3.0155
STM32Many485
80 × 84 mm107 parts2LNo license206
STM32Stm32
98 × 63.5 mm98 parts2LNo license206
STM32Sigint systems
embeddedos-org
280 × 200 mm631 parts16LMIT8
STM32Mainboard
58 × 35 mm86 parts2LNo license206
STM32MicroRusEfi
129.5 × 127.6 mm199 parts2LNo license97
STM32Windshield
66 × 54 mm86 parts2LNo license206
STM32Sonar systems
233 × 160 mm538 parts12LMIT8
STM32Chiller control
62 × 60.5 mm69 parts2LNo license206
STM32C4isr
260 × 200 mm525 parts14LMIT8
STM32Servo control
53 × 47 mm59 parts2LNo license206
STM32Encoder
78 × 81 mm53 parts2LNo license206
STM32Shutter
61 × 49.5 mm40 parts2LNo license206
STM32Electronic warfare
233 × 160 mm502 parts14LMIT8
STM32Hall
45.3 × 46.9 mm34 parts2LNo license206- schematic only · 234 partsSTM32
Fx3u 24mr
234 parts2LNo license206
About these open source PCB designs
Every board here is a published hardware project: a public GitHub repository with KiCad design files and a bill of materials. HardLabs reads those files directly — the board outline for its size, the copper layers, every footprint for the parts list — and draws the render from the layout itself, so what you see is the design as committed rather than a product photo.
Boards are indexed by the microcontroller they are built around, by what they are for, and by every IC and module on them. That makes the gallery a quick way to find a reference design: look up a part number to see how other engineers power, decouple and connect it.
Using an open source board as a reference design
- Find boards built on your chip or with the part you are designing around.
- Compare their size, layer count and bill of materials, and open the KiCad files on GitHub.
- Check the license before reusing any of the design.
- Simulate the firmware on HardLabs to test your changes before you order a PCB.
Open source PCB designs: common questions
What is an open source PCB?
A printed circuit board whose design files — schematic, layout and bill of materials — are published for anyone to study and, depending on the license, to modify and manufacture.
Are these PCB designs free to use?
It depends on each project's license. Open hardware licenses such as CERN-OHL and CC BY-SA, and software licenses such as MIT, allow reuse on their terms; a repository with no license keeps all rights with its author. Every board page shows its license.
What design files do the boards come with?
They are KiCad projects: the .kicad_pcb layout and the schematic (or a netlist from older KiCad versions), plus a bill of materials, usually a CSV. Each board page links to those files in the original GitHub repository.
How do I find boards that use a specific part?
Search for the part number, or open the part's page from the list of parts. It shows every board built with that part and the parts most often used alongside it.
How many boards are there, and how often is the list updated?
780 boards from 256 repositories today. New projects are found and added every night.
Can I test a board's firmware before ordering the PCB?
Yes. HardLabs builds a simulation of a board from its netlist and BOM, so you can boot and debug firmware against it with no hardware on your desk.