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.
RP2040/RP2350Hackbat
controlpaths
100 × 42 mm78 parts4LCC0-1.01.0k
ESP32Ble stepper motor analyzer
zapta
38.5 × 43 mm58 parts2LNo license58
ESP32ESP-32 WLED-Controller
der-pw
59.5 × 31.2 mm19 parts2LNo license30
WCH CH32/CH55xTrhmsx
cristianoag
150.4 × 120.4 mm127 parts4LNo license29
ESP32WLED All in one ESP32 Controller
Hasenpups
49.3 × 30.5 mm21 parts2LCC-BY-NC-4.019
RP2040/RP2350RaspberryPi-Pico-Motor-Expansion-Board
eamars
91.7 × 66.8 mm63 parts4LGPL-3.018
ESP32Defcon32 badge
thehackbat
60 × 100 mm36 parts2LGPL-3.013
ESP32Iot leddriver hw
0xjmux
57 × 56 mm58 parts4LNo license9
STM32Infrared gun
souptik-samanta
36 × 40 mm38 parts2LNo license7
STM32Stm32-nrf24-wireless node
denysderihlazov
46 × 75.9 mm46 parts2LMIT3
ESP32Pilot 6 axis
X-Lemon-X
171 × 83.9 mm125 parts2LMIT2
ESP32Mosaic x3
shashwtd
21 × 128 mm32 parts2LNo license2- schematic only · 82 partsSTM32
Filament-Guillotine
Zephino
82 partsCC-BY-SA-4.02 
STM32CustomDisplay-Hardware-F7
svcguy
76.2 × 68.6 mm92 parts4LGPL-3.01
ESP32Mood-Display
Axe-1st
70.2 × 70.2 mm54 parts2LNo license1
ESP32PCB-Business-Card
Studented0
100 × 75 mm20 parts2LMIT1
ESP8266ESP8266-WiFiRelay-IndustrialIoT
ajvizganapathy-pixel
40 × 30 mm19 parts4LNo license1
STM32Tachi-Ninja
CreatorPoints
308.5 × 129 mm201 parts2LMIT0
ESP32Load Demand Response System
jsitech4
198.1 × 130.8 mm133 parts4LNo license0
NXPMcguitarpedal
frsaba
123 × 113.5 mm113 parts2LNo license0
2040-artnode
dnewcome
100 × 70 mm80 parts4LNo license0
ESP32Node-Smart-Clock
martinsram3k
95 × 54 mm41 parts2LNo license0
ESP32Fluxguard
lizuyi-6
52 × 29 mm34 parts4LNo license0
ESP32Jay-Tab
Jay-Tai
109.3 × 90.7 mm12 parts2LMIT0- schematic only · 39 partsESP32
CAPSTONE-2026
kolisahil2709
39 parts2LNo license0 
USB-C-Screen-Adapter-LDR6023SS
Jana-Marie
31 × 34.4 mm40 parts2LGPL-3.068
ESP32Smart Home Energy Management System
198.1 × 130.8 mm133 parts4LNo license0
ESP32Smart Hybrid IOT energy management System
198.1 × 130.8 mm133 parts4LNo license0
ESP32Smart Transformer Health Monitoring System
108.8 × 83.6 mm81 parts2LNo license0
ESP32Solar Powered Irrigation System
91.6 × 57.8 mm70 parts2LNo 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.