80 open source boards in Power & battery
Power supplies, battery chargers and BMS, USB-PD, buck and boost converters and solar. 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.
ESP32Badge
atopile
56.3 × 39 mm239 parts4LMIT4.0k
STM32AxxSolder
AxxAxx
39 × 82.5 mm122 parts2LGPL-3.01.7k
RP2040/RP2350Open Source Smart Glasses
Mentra-Community
93 × 10.5 mm80 parts4LMIT1.2k
ESP32Silkscreen pcb
iandchasse
60 × 111.3 mm171 parts2LCERN-OHL-S-2.0554
STM32Twonkie
dojoe
25.4 × 25.4 mm56 parts4LNo license415
STM32EEZ DIB MCU r1B2
eez-open
139 × 70 mm191 partsTAPR-OHL-1.0391- schematic only · 3 parts
Circuit synth
circuit-synth
3 partsMIT276 
RP2040/RP2350BusPirate-5-rev10
DangerousPrototypes
60.5 × 60 mm210 parts4LMIT123
ZC95 MKII
CrashOverride85
191.5 × 76 mm319 parts2LGPL-3.0112
ESP32Plantpal
teapotlaboratories
38.4 × 128.5 mm109 parts4LMIT97
Microchip SAMTiny4FSK
New-England-Weather-Balloon-Society
35.1 × 76.3 mm80 parts4LCERN-OHL-W-2.095
PDNode Baseboard
DvidMakesThings
203 × 151.8 mm208 parts6LAGPL-3.082
ESP32Sra dev board 2026
SRA-VJTI
90.2 × 90 mm145 parts2LMIT80
ESP32TRS-IO++
apuder
145.7 × 107.8 mm94 parts2LGPL-3.074
Fox-1-MPPT
FaradayRF
95 × 95 mm453 parts4LCustom license63
USB-C PD 5V supply — development
rjwalters
100 × 65 mm47 parts4LMIT63
ESP32Ups to esp32
aronreid
36 × 58 mm38 parts2LGPL-3.052
PIC12v automatic ups
dilshan
131.8 × 99.9 mm72 parts2LMIT49
ESP32AnthC
Anthilla
85 × 56 mm203 parts4LNo license39
Nordic nRFHotswap ble
ebastler
271.8 × 103.9 mm134 parts2LCC-BY-NC-4.036
LiBCM - Honda Insight BCM Replacement
doppelhub
355 × 160 mm706 parts4LCC-BY-SA-4.025
Joule Chief
fishPointer
84 × 98 mm90 parts2LMIT25
Cell sim
220 × 110 mm1152 parts4LMIT24
ESP32Charge Controller
jharvey
139.7 × 88.9 mm157 parts2LNo license24
AVR/ArduinoBatterymeter
hb020
106.1 × 29.2 mm143 parts4LNo license19
Toern
Soundpauli
160 × 71 mm118 parts4LCC-BY-NC-4.019- schematic only · 69 parts
Cohdl
conol-ai
69 partsMIT16 
Sisu SSE-9
briskspirit
43.9 × 118.2 mm259 parts6LUnlicense15
EX-MotorShield8874
DCC-EX
65.9 × 52.9 mm75 parts4LCERN-OHL-W-2.011
ESP32Paperflux
albanpetit
33.5 × 50 mm43 parts4LNo license10
Raspberry PiLamoka1/2 PCB
bearjhartjen
122.7 × 124.8 mm126 parts2LCERN-OHL-W-2.07
ESP32Esp32-c3-iot sensor board
Ans1S
35.4 × 21.6 mm57 parts4LMIT6
Raspberry PiThe 4DS
Astronuat21
160 × 90 mm347 parts4LAGPL-3.04
ESP32Esp32-emu turbo
pjcau
160 × 75 mm102 parts4LNo license4
Unoq power shield
ramalamadingdong
53.3 × 68.6 mm49 parts4LGPL-3.04
Cphp82001
calcpsu
56 × 44 mm26 parts2LCC-BY-NC-4.04