Open source PCB designs you can simulate
24,141 boards
Every public KiCad project we can find on GitHub, with its processor, full parts list and a render of the board. Any of them can be brought up in simulation: open one and run firmware on it before you order a single PCB.
AVR/ArduinoPhnx
sini6a
286.3 × 133.4 mm178 parts4LNo license4- schematic only · 332 partsAVR/Arduino
Skayboard
Skaytacium
332 partsMIT3 
AVR/ArduinoMacropad
vlee6
58.5 × 80.9 mm52 parts2LNo license2
AVR/ArduinoKeeBoard
scattercat-123
351.9 × 99.3 mm267 parts2LNo license1
AVR/ArduinoMithril panneled
sanfeps
132.8 × 138.8 mm216 parts4LNo license1
AVR/ArduinoCustom keyboard
balkacer
292 × 99.9 mm135 parts2LNo license1
AVR/ArduinoSdraKb00
drabaioli
176.2 × 83.4 mm85 parts2LMIT1
AVR/ArduinoKeyboard3-L
e04
130.8 × 111 mm78 parts2LNo license1
AVR/ArduinoDetach75-keyboard
seakrueger
319.9 × 131 mm188 parts2LApache-2.00
AVR/Arduino65 percent keyboard
wemsh05
335.5 × 146 mm157 parts2LNo license0
AVR/ArduinoSimple-Keyboard-Project
MRM1790
285 × 94.6 mm150 parts2LNo license0
AVR/ArduinoPika-Board-Files
FrenzyExists
85.7 × 118.3 mm55 parts2LNo license0
AVR/ArduinoSplit mini left
tamago324
94.8 × 81.9 mm37 parts2LNo license8
AVR/ArduinoMithril
269.8 × 158.8 mm211 parts4LNo license1
AVR/ArduinoKeyboard3-R
130.8 × 111 mm77 parts2LNo license1
AVR/ArduinoSplit mini right
94.8 × 81.9 mm37 parts2LNo license8
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?
24,141 boards from 12,208 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.