Open source PCB designs you can simulate
6,828 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.
Nordic nRFAhokore
dezlidezlidezli
265.7 × 103.8 mm98 parts2LCustom license84
ESP32Electronics-Design-Exploiteers-Hacker-Pager
exploiteers
108.5 × 79 mm181 parts4LCERN-OHL-S-2.026
ESP32ProtogenControllerV1
coelacant1
65 × 52 mm59 parts4LGPL-3.08
Halberd v2
RemkoPr
72.8 × 82 mm72 parts4LNo license4
ESP32DC-34-Badge
Cyber-Professionals-Enthusiast-Club
145.2 × 203.4 mm87 parts2LNo license3
ESP32Capsicum
hutscape
70 × 55 mm61 parts2LNo license2
ESP32Esp32s3-plant monitor
MuffinByteLabs
62.5 × 44.5 mm51 parts4LCERN-OHL-P-2.02- schematic only · 9 partsESP32
Kicad iot sensor board
bradleybeatz1313
9 partsNo license2 
ESP32Nex
dialgorithm
35 × 39 mm60 parts2LNo license1
ESP32Esp8266-temp proto
ShawnHymel
35.6 × 50.8 mm26 parts2LNo license1
ESP32DroneMagNav2.0
ajisrawi
128 × 84 mm218 parts4LCustom license0
ESP32Poket
kaorii-ako
80 × 54 mm100 parts4LMIT0
STM32Blackmagic
aeremin
49 × 40 mm55 parts4LNo license0
ESP32Race tracker
jonaschramm
56.1 × 65.5 mm49 parts4LNo license0
ESP32ESP32 4-20mA Sensor
Diode663
40 × 61 mm47 parts2LCERN-OHL-P-2.00
ESP32C3-pico
FrancoSpitale
28.4 × 51.5 mm21 parts2LMIT0
ESP32InduLink-485
8aChristian
115 × 75 mm20 parts4LMIT0
ESP32DC-34-Badge panel
460.9 × 228.8 mm87 parts2LNo license3
ESP32Main
Ajakovski
100 × 120 mm30 parts4LMIT1
ESP32Esphome nfc
68.3 × 41 mm43 parts4LNo license0
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?
6,828 boards from 3,344 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.