2,438 open source boards in Dev boards & breakouts
Development boards, breakouts, shields, HATs and carrier boards. Every board here is a public GitHub project with its KiCad files, read for size, layers and parts. Pick one close to your design and simulate its firmware on HardLabs before you build it.
Meshgw hat fab
d3athstr
65 × 56 mm5 parts2LNo license0
AS5048
AQUA-Warrior
18.3 × 19.5 mm4 parts2LNo license0
SBK PFET1
sbarabe
10.7 × 9.9 mm4 parts2LCERN-OHL-P-2.00
Adafruit USB Type C Downstream Breakout rev B
eloicote
20.3 × 14 mm3 parts2LGPL-3.00
Sensor bus hat
sslivins
16.5 × 26.5 mm3 parts2LNo license0- schematic only · 92 parts
ACU5EV SoM Carrier Board
raonslab2
92 parts6LNo license0 - schematic only · 72 partsESP32
Kicad
goog-yaml
72 parts2LNo license0 - schematic only · 61 parts
Universal io board-Hat
alexspur
61 parts2LNo license0 
ESP32Easyduino ESP32S3
Hanqaqa
25.9 × 63.9 mm35 parts4LCERN-OHL-P-2.0746
Radioberry juice
pa3gsb
65 × 56 mm87 parts2LNo license675
Stm32f0 disco Luos shield
Luos-io
55.9 × 99.1 mm26 parts2LMIT547
Sram dev board
Wren6991
50 × 50 mm12 parts2LNo license508
ESP32RatGDO-OpenSource-D1Mini-ESP32
Kaldek
51.8 × 63.4 mm12 parts2LMIT506
Connecting piece
Chrismettal
66.4 × 24.5 mm20 parts2LCC-BY-SA-4.0446
Meta breakout
parallella
97.8 × 71.1 mm5 parts4LCustom license422
ESP32ESP32-PoE Rev L1
OLIMEX
28 × 80 mm131 parts4LApache-2.0407
Proto ads bee rf board
PantsForBirds
44 × 28 mm16 parts2LGPL-3.0322
ESP32ESP32-EVB
75.2 × 74.7 mm157 parts2LApache-2.0285
USD extender male
newdigate
24.8 × 10.9 mm3 partsMIT258
RP2040/RP2350Zpn devboard
CRImier
100 × 100 mm160 parts4LGPL-3.0253
Raspberry Pi Hat Interface - iMac G3 J20
qbancoffee
19.7 × 17.8 mm9 parts2LLGPL-3.0236
Pmw3360 pcb pinheader
siderakb
23.5 × 33 mm12 parts2LCERN-OHL-P-2.0194
STM32Stm32f411 breakout
blakesmith
22.9 × 81.3 mm53 parts2LNo license167
Breakout board for SEthernet series Ethernet cards
rhalkyard
111.8 × 56 mm11 parts2LGPL-3.0164
Taira bottom plate
strayer
151.5 × 121.2 mm8 parts2LMIT161
MRF-Pro v7.5-breakout
acornelissen
21 × 15.5 mm3 parts2LGPL-3.0157
ESP32FujiNet ESP32-DevKitC-VE Shield
FujiNetWIFI
99.1 × 55.9 mm40 parts2LCERN-OHL-S-2.0138
ESP32Marauder spoof
ElectronicCats
75 × 74.7 mm26 parts2LNo license130
AVR/ArduinoBE6502 Mega Adapter
tebl
99.1 × 99.1 mm20 parts2LCERN-OHL-1.2128
AVR/ArduinoPatch shield analog
OpenElectronicsLab
197 × 71 mm39 partsGPL-3.0102
STM32ArmTrax
embeddedalpha
93.6 × 32 mm92 partsMIT75
Sitina 1 JTAG Breakout
CameraNexus
21.5 × 14 mm5 parts2LMIT73
ESP32ESP32-P4-DevKit Rev B
30 × 72 mm150 parts4LGPL-3.059
Adapter
iorodeo
26.7 × 50.8 mm8 parts2LCC-BY-4.057
AVR/ArduinoSirDuke
vul-os
42.4 × 14.1 mm20 parts2LApache-2.055
UMyriadRF7002
myriadrf
59.3 × 41.4 mm177 parts8LNo license50
Browse boards by part
AMS1117-3.3 1196USBLC6-2SC6 983RP2040 699W25Q128JVS 421AP2112K-3.3 376TL072 339TL074 307ESP32-S3-WROOM-1 304CH340C 274L7805 271Pico 25174HC595 248USBLC6-2P6 248LM358 228AP2112K-3.3TRG1 205Arduino_Nano_v3.x 19774LS04 193LM7805_TO220 185ESP32-WROOM-32 18274LS245 171SRV05-4 169W25Q128JVSIQ 16974LS138 16274LS32 161