HardLabs

Cube SAT

barcklay·Cube_SAT·hardware/flight_pcb/hab1_flight.kicad_pcb

Cube SAT PCB layout, top view — open source STM32 board by barcklay

About the Cube SAT PCB

Cube SAT is an open source STM32 PCB design by barcklay, published on GitHub. It is a 4-layer board measuring 95.9 × 90.2 mm, with 46 components from 31 distinct parts.

Its main chip is the STM32G474RET6, from the STM32 family. Other key parts include the MIC5219-3.3. By type, the board carries 14 capacitors, 12 resistors, 11 connectors, 3 diodes, 2 ICs and 2 transistors.

It belongs with the rf & radio, sensors and dev boards & breakouts designs in this gallery.

From the project

Building Sattelite part time

HAB-1 is an experimental payload for a high-altitude weather balloon. It will climb to about 30 km, record what happens on the way up, fall back under a parachute, and then has to be found on the ground. First flight planned in Thailand, February–March 2027.

Interactive 3D model: https://claude.ai/artifact/VP8YPhxGNXckYP5Keu93rK — scrub through the flight, open the box and look at the board inside. Code and design files: https://github.com/barcklay/Cube_SAT (this repository)

Cube SAT, from the project README
From the project README

Main components on the Cube SAT

STM32G474RET6MIC5219-3.3

Cube SAT bill of materials (BOM)

46 components, 31 distinct parts.

QtyPartRefs
1
STM32G474RET6
U1
1
MIC5219-3.3
U2
1
AO3401A
Q1
1
AO3400A
Q2
1
BATTERY 4xL91
J1
1
POWER SWITCH (on the box)
J2
1
STDC14 SWD+VCP
J3
1
SPI FLASH module
J4
1
IMU GY-601N1
J5
1
BAROMETER BMP390
J6
1
GPS MAX-M10S
J7
1
DS18B20 probe
J8
1
LoRa E22-400M22S (adapter)
J9
1
OLED SSD1306 (bench)
J10
1
BUZZER (+ / -)
J11
1
RESET
SW1
1
ALIVE green
D1
1
GPS FIX blue
D2
1
1N4148W
D3
1
600R@100MHz
FB1
Show 11 more
QtyPartRefs
2
10u
C1, C2
1
470p
C3
8
100n
C4, C5, C6, C7, C8, C9, C12, C13
1
4.7u
C10
1
1u
C11
1
47u
C14
4
10k
R1, R7, R8, R9
2
100k
R2, R12
1
47k
R3
3
4.7k
R4, R5, R6
2
1k
R10, R11

Cube SAT design files

The KiCad project lives in the barcklay/Cube_SAT repository on GitHub; these links point at the commit this page was built from.

Cube SAT: common questions

What microcontroller does the Cube SAT use?

The Cube SAT is built around the STM32G474RET6, from the STM32 family.

How big is the Cube SAT PCB?

The Cube SAT measures 95.9 × 90.2 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Cube SAT?

46 components, from 31 distinct parts. The full bill of materials is listed on this page.

Where can I download the Cube SAT design files?

From the barcklay/Cube_SAT repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Cube SAT design in my own project?

The repository has no license, so all rights stay with barcklay. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Cube SAT without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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