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/ArduinoCococpld
mattstock
83.3 × 98.3 mm60 partsNo license7
AVR/ArduinoBOX-2252
fallberg
50.5 × 70 mm60 parts2LCERN-OHL-1.27
AVR/ArduinoDarkstar Mk.II
kajusK
34 × 34 mm56 parts2LCERN-OHL-1.27
AVR/ArduinoKeaboard rev1
keawade
141.9 × 93.7 mm55 parts2LNo license7
AVR/ArduinoUnoShield
MBI-Ignitions
68.6 × 53.3 mm55 parts2LGPL-3.07
AVR/ArduinoBerlinUhr
designer2k2
100 × 130.1 mm53 parts2LGPL-3.07
AVR/ArduinoProtoino01
hwreverse
75 × 66 mm52 parts2LBSD-3-Clause7
AVR/ArduinoDual swing gate controller
motivemachine
99.7 × 99.1 mm50 parts2LMIT7
AVR/ArduinoTeCoLab
ytcsc
95.1 × 93.8 mm48 parts2LMIT7
AVR/ArduinoMyTrackr
SukkoPera
50 × 50 mm39 parts2LNo license7
AVR/ArduinoTandy1400
arlaneenalra
173.4 × 62.1 mm39 parts2LCC-BY-SA-4.07
AVR/ArduinoSwarm-B2
paulodowd
81.7 × 72.1 mm32 parts2LGPL-3.07
AVR/ArduinoAVRThermostat
protaskin
54.6 × 71.8 mm31 parts2LMIT7
AVR/ArduinoUsbkbdshield vt100
ryu10
68.6 × 53.2 mm29 parts2LNo license7
AVR/ArduinoNixie clock
njeff
148.1 × 37.1 mm29 parts2LNo license7
AVR/ArduinoCollectorPanel
tjhiker
157.5 × 81.3 mm22 parts2LNo license7
AVR/ArduinoArduino nano-2-parallel cnc tb6560-4axis
samowitsch
55.9 × 63.5 mm21 parts2LCC0-1.07
AVR/ArduinoIG-LiPo-Battery-Gauge
makhowastaken
23.4 × 13.7 mm21 parts2LGPL-3.07
AVR/ArduinoHDMI2SCART
c0pperdragon
40 × 27 mm19 parts4LNo license7
AVR/ArduinoDPS5015--Nextion
radioelf
38.1 × 53.9 mm17 parts2LNo license7
AVR/ArduinoPC-6001 SD
yanataka60
79 × 127 mm17 parts2LMIT7
AVR/ArduinoArduino-Nano-FM-Radio-Si4703
TeknoTrek
95.5 × 104.7 mm15 parts2LNo license7- schematic only · 69 partsAVR/Arduino
Thotcon0x5
Workshop88
69 partsNo license7 - schematic only · 55 partsAVR/Arduino
ACRIS
jwcxz
55 partsNo license7 - schematic only · 10 partsAVR/Arduino
Korg ms20m extra midi2cv
retango
10 partsGPL-3.07 - schematic only · 7 partsAVR/Arduino
SolarChargerSZBK07ModuleV2
farmerkeith
7 partsNo license7 
AVR/ArduinoLargeWordClock
LikeClockwork
398.2 × 398.2 mm579 parts2LMIT6
AVR/ArduinoMechBoard16
386.1 × 97 mm247 parts2LNo license6
AVR/ArduinoPlain60-alps edition
evyd13
284.7 × 94.2 mm181 parts2LCC-BY-SA-4.06
AVR/ArduinoBertha main
Hackuarium
100 × 87 mm155 parts2LNo license6
AVR/ArduinoWifire16
propane-and-electrons
203.2 × 82.6 mm152 partsNo license6
AVR/ArduinoBakeneko40
HorseyMask
266.7 × 76.2 mm115 parts2LMIT6
AVR/ArduinoAlpha.ctrl
banjomasterpete
265 × 200 mm113 parts2LMIT6
AVR/ArduinoMuscle imbalance detection
leikoilja
56.8 × 68.6 mm82 parts2LMIT6
AVR/ArduinoBrushlessESC
Tynogc
50 × 60.5 mm79 parts2LNo license6
AVR/ArduinoMATRIX PROJECT
AronAyub
128.8 × 81.8 mm77 parts2LNo license6
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