2,233 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.
ESP32SparkFun Thing Plus ESP32-S3
sparkfun
22.9 × 58.4 mm60 parts4LMIT12
Antimner S9 HatBoard
Kcctech-git
100 × 81 mm60 parts2LNo license12
Ublox breakout
thinkfat
47.2 × 33.2 mm44 parts4LNo license12
ESP32STM32L0-ESP32-Breakout-Board
mohamedyanis
50 × 50 mm31 parts4LBSD-3-Clause12
AVR/ArduinoPCB ATtiny85
tidus747
80.3 × 58.6 mm25 parts2LGPL-3.012
MounT K85 Feather
bkw777
50.8 × 22.9 mm10 parts2LGPL-3.012
LT3045 breakout
PatrickBaus
10.2 × 14.6 mm10 parts2LCERN-OHL-1.212
TS4231-breakout board
DotBots
12 × 12.9 mm6 parts2LBSD-3-Clause12
STM32Hx4k pmod
rschlaikjer
100 × 55 mm97 parts2LMIT11
PistormTester
abrugsch
99.8 × 99.8 mm92 parts2LNo license11
RP2040/RP2350Tt123-demo
TinyTapeout
104.5 × 81 mm89 parts2LApache-2.011
SparkFun GNSS UM980
50.8 × 50.8 mm76 parts4LMIT11
EX-MotorShield8874
DCC-EX
65.9 × 52.9 mm75 parts4LCERN-OHL-W-2.011
AVR/ArduinoDriverino-Shield
weirdgyn
68.6 × 53.3 mm56 parts2LGPL-3.011
RP2040/RP2350Adafruit ESP32 Feather V2
cgallizzi
50.8 × 22.9 mm51 parts2LMIT11
STM32STM32F030K6
r-pv
22 × 41 mm23 parts2LGPL-3.011
TXB0108
upsidedownlabs
13.7 × 26.4 mm6 parts2LMIT11
Trackball
overset
48.9 × 41.5 mm5 parts2LMIT11
WiigLED
Architeuthis-Flux
78.7 × 58.4 mm513 parts4LMIT10
FPGAECP5U85-BSE-USB Breakout Board
open-ephys
50 × 75 mm208 parts6LCustom license10
ESP32ESP32-S3-Platform
WhirlingBits
97.5 × 90.6 mm176 parts4LMIT10
FPGAEcp5-dev board
medhyal
68 × 43 mm107 parts4LNo license10
RISC-VWchlinke swd adapter checker
74th
52 × 50 mm59 parts2LMIT10
Hx8k breakout extension
maikmerten
44.2 × 65.3 mm23 parts2LMIT10
Max7 proto
skiselev
20.3 × 52.1 mm21 parts2LGPL-3.010
Ice tracking beacon
cryologger
133 × 63 mm14 parts2LGPL-3.010
2 CH 4-20 mA to voltage converter board
Fescron
46.4 × 46.4 mm14 parts2LNo license10
FeatherCandle
mnemocron
254 × 22.9 mm13 parts2LNo license10- schematic only · 26 parts
Dc scm osm l carrier card
antmicro
26 partsApache-2.010 
RP2040/RP2350HALPI2-hardware
hatlabs
187 × 109 mm541 parts6LCustom license9
Dc scm breakout board
108 × 70 mm274 parts6LApache-2.09
1026-RPi-Power-Hat
wilsondr9999
85 × 56.5 mm121 parts4LCC-BY-SA-4.09
STM32Crazyflie audio
LCAV
133 × 133 mm113 parts2LMIT9
STM32STM32MP1 TestBoard RevB
cracked-machine
73.7 × 80 mm109 partsMIT9
RP2040/RP2350Tfr9
strickyak
82.8 × 62.8 mm106 parts4LMIT9
RP2040/RP2350Cata
skarrmann
209 × 76 mm69 parts2LMIT9
Browse boards by part
AMS1117-3.3 1034USBLC6-2SC6 836RP2040 609W25Q128JVS 388TL072 309AP2112K-3.3 308TL074 274ESP32-S3-WROOM-1 266CH340C 242L7805 224Pico 21874HC595 213USBLC6-2P6 200LM358 19074LS04 175AP2112K-3.3TRG1 173ESP32-WROOM-32 167SRV05-4 165Arduino_Nano_v3.x 15974LS245 156LM7805_TO220 15574LS138 152W25Q128JVSIQ 15174LS32 148