2,263 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.
OddPCIe
a-little-wifi
30.5 × 45.5 mm15 parts4LNo license3
ESP8266Esp8266-tiny breakout board
ezcGman
27.5 × 32.4 mm14 parts2LNo license3
28c eeprom programmer
NetworkEntropologist
109 × 70 mm13 parts2LNo license3
Ozone sensor-MQ131-breakout hardware design
SolderedElectronics
22 × 38 mm12 parts2LTAPR-OHL-1.03
Egg LDO 250
Plaenkler
14 × 15 mm10 parts2LBSD-3-Clause3
BME280-Breakout
Destination-SPACE
12.7 × 12.7 mm10 parts2LCERN-OHL-P-2.03
Orangepi zero3w m2-carrier
Techburst36
32 × 65 mm8 parts2LNo license3
BananaBoard
Cuprum77
54.1 × 30.1 mm8 parts2LCERN-OHL-S-2.03
HDMI PMOD
OniDaito
41.4 × 19.1 mm6 parts2LNo license3- schematic only · 33 parts
BC660K-LTE-Breakout
axiopaladin
33 parts2LCERN-OHL-W-2.03 - schematic only · 8 parts
Neuroboard
Be-bibek
8 partsMIT3 - schematic only · 1 parts
ROHM SensorPlatform Multi-Sensor-Shield
ROHMUSDC
1 partsNo license3 
FPGAICE40hxk4 dev board
smartbench
67 × 157 mm379 parts4LNo license2
RP2040/RP2350FREEBOARD
Ningheim
314.3 × 161.9 mm360 parts2LMIT2
STM32Sonar Development Board
bluerobotics
98 × 133 mm346 parts8LCERN-OHL-P-2.02
Raspberry PiBoard v3-83pct
dmz006
150 × 112 mm299 parts4LCustom license2
Lpt breakout board
awpe
180.5 × 52.3 mm247 parts2LNo license2
Hw udsp card
crsknr
60 × 30 mm211 parts6LGPL-3.02
Signalbridge board
carlosmazzei
99.7 × 91.3 mm171 parts4LCERN-OHL-P-2.02
Radiohat 2.0 Preliminary (not a Hat)
mpvano
85 × 56 mm153 parts4LMIT2
RP2040/RP2350Chipignite discover
efabless
53.5 × 65.5 mm139 parts4LApache-2.02
Breakout boards
Davang
155 × 77 mm122 parts2LGPL-3.02
Servo Motor Shield v1
cxxx1828
160 × 101.6 mm120 parts2LNo license2
ESP32ESP32 Breakouts Playground
PockyBum522
203.1 × 108.1 mm116 parts2LMIT2
ESP32MinRead
Monacrylic
64.5 × 120.5 mm114 parts2LNo license2
AVR/ArduinoBADGEr
wyolum
101.6 × 78.7 mm114 parts2LNo license2
Robodev Actuators
alexbnz-1
88 × 83.5 mm113 parts4LMIT2
Gm study e1
fm4dd
100 × 70 mm105 parts2LCERN-OHL-P-2.02
Raspberry PiGranit
laenzlinger
92 × 99.5 mm102 parts4LCERN-OHL-P-2.02
Development board
inoa-io
153 × 77 mm97 parts2LCERN-OHL-P-2.02
Core
Zhang-JK
30 × 51 mm96 parts4LNo license2
74hc165-breakout
sourcebox
114 × 53 mm95 parts2LCC-BY-4.02
ESP32Eja m
leonardoward
51.2 × 97.5 mm91 parts4LApache-2.02
PICUPIC46
emertcakir
66.6 × 41.3 mm90 parts2LMIT2
Riscduino Uno
dineshannayya
70.6 × 53.7 mm90 parts2LApache-2.02
IrrigationPiHat
Cameron-Ray
65.2 × 30.1 mm85 parts6LMIT2
Browse boards by part
AMS1117-3.3 1069USBLC6-2SC6 866RP2040 632W25Q128JVS 394TL072 319AP2112K-3.3 313TL074 281ESP32-S3-WROOM-1 268CH340C 249L7805 229Pico 22174HC595 218USBLC6-2P6 206LM358 20074LS04 180AP2112K-3.3TRG1 179ESP32-WROOM-32 169LM7805_TO220 167SRV05-4 165Arduino_Nano_v3.x 16474LS245 160W25Q128JVSIQ 15774LS138 15574LS32 152