3,813 open source AVR/Arduino boards
ATmega and ATtiny microcontrollers, Arduino-compatible boards and Arduino shields. 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.
AVR/ArduinoArduino NMR 5.4
SoukeyCircuits
90 × 79 mm126 parts4LGPL-3.052
AVR/ArduinoSDBox v2
jbilander
47 × 50 mm20 parts2LGPL-3.052
AVR/ArduinoJ67G
Salicylic-acid3
285 × 95.1 mm156 parts2LMIT51
AVR/ArduinoAC ChargingStation
PedroCNeves
53.9 × 69.6 mm32 parts2LNo license51
AVR/ArduinoCec2usb
RedoXyde
23.7 × 30.5 mm27 parts2LNo license50
AVR/ArduinoShutter speed tester
sebastienroy
48.3 × 48.3 mm13 parts2LGPL-3.050
AVR/ArduinoOTTOtact
cester-ino
307 × 131.2 mm224 parts2LGPL-3.049
AVR/ArduinoVitamins included
Duckle29
114.3 × 82 mm150 parts2LBSD-3-Clause49
AVR/ArduinoAVR-Transistor-Tester
Upcycle-Electronics
141 × 66 mm55 parts2LNo license49
AVR/ArduinoSense debug
unsurv
65 × 40 mm44 parts4LNo license49
AVR/Arduino1541-rebuild
ThKattanek
71.6 × 65.8 mm19 parts2LGPL-2.049
AVR/ArduinoQol56
eswai
272 × 86 mm171 parts2LNo license48
AVR/ArduinoTwelvekey
str-dst
75.2 × 62.6 mm52 parts2LCC-BY-NC-4.048
AVR/ArduinoHot Plate controller
c0pperdragon
60 × 100 mm25 parts2LNo license48
AVR/ArduinoISACard
profdc9
189.7 × 95.9 mm99 parts2LCC-BY-SA-4.046
AVR/ArduinoNANO-Minipops
NANOmodules
68.6 × 53.3 mm18 parts2LNo license46
AVR/ArduinoPhaseLatch
AndersBNielsen
68.8 × 53.6 mm120 parts4LNo license45
AVR/ArduinoQuefrency right-65
keebio
178.6 × 99.4 mm100 parts2LMIT45
AVR/ArduinoFaduino
silveirago
136.5 × 185 mm92 parts2LNo license45
AVR/ArduinoOpenTheremin V3 Shield
GaudiLabs
60 × 100 mm84 parts2LGPL-3.045
AVR/ArduinoPhaseLoom
68.8 × 53.6 mm77 parts4LNo license45
AVR/ArduinoKBD8X-MKII
ai03-2725
343.7 × 118.3 mm342 parts2LCC-BY-NC-4.044
AVR/ArduinoMinimal-UART-Computer-3
slu4coder
208.9 × 170.8 mm202 parts2LNo license43
AVR/ArduinoGingham-USBC
yiancar
285.8 × 123.8 mm162 parts2LCC-BY-SA-4.043- schematic only · 80 partsAVR/Arduino
ATS-20
Emmemad
80 partsNo license43 
AVR/ArduinoMM-control-2.0
prusa3d
106 × 45 mm161 parts4LNo license42
AVR/ArduinoReplica datanetics
schlae
298.5 × 139.7 mm145 parts2LNo license42
AVR/ArduinoNanoGris
Quinienl
68.5 × 108 mm108 parts2LGPL-3.041
AVR/ArduinoOtterX
RetroRemake
170.1 × 170.1 mm168 parts4LCERN-OHL-W-2.040
AVR/ArduinoSgb mbc5 1-4
MouseBiteLabs
110.7 × 69.8 mm88 parts4LCC-BY-SA-4.040
AVR/ArduinoATMEGA328-Motor-Board
AntonioMR
77 × 100 mm171 parts2LNo license39
AVR/ArduinoMAUS
MAKERSUN99
32.6 × 19.4 mm14 parts2LGPL-3.039
AVR/ArduinoC2c-64
jsanpe
50 × 50 mm106 parts4LMIT38
AVR/ArduinoMaehwerktreiber
schuhumi
100.3 × 100.2 mm73 parts2LGPL-3.038
AVR/ArduinoPS2PSP
orangeglo
52.1 × 37.4 mm20 parts2LGPL-3.038
AVR/ArduinoFoundation
odeliy
48 × 110 mm123 parts2LNo license37
Browse boards by part
AMS1117-3.3 1847USBLC6-2SC6 1502RP2040 1017W25Q128JVS 654AP2112K-3.3 635ESP32-S3-WROOM-1 488TL072 446L7805 43674HC595 404TL074 404CH340C 392LM358 367Pico 356USBLC6-2P6 351AP2112K-3.3TRG1 345Arduino_Nano_v3.x 317LM7805_TO220 315ProMicro 29774LS04 285ESP32-WROOM-32 285PC817 260SRV05-4 25874LS245 257TP4056 250