2 layers46.9 × 46.6 mm
Fourth
Bhakti-A/Maya_V_FlightController
This is a custom flight controller PCB designed for drones.
84 parts1
4 layers22 × 27.6 mm
STM32F031
Caljay/STM32DevBoardSTM32 Devboard using the STM32F031 MCU
- Size
- 22 × 27.6 mm
- Copper layers
- 4
- Thickness
- 1.33 mm
- Parts
- 25
- Nets
- 34
- Pads
- 125
- Tracks, vias
- 229, 23
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Jul 2026
- Updated
- 13 Jul 2026
Overview
STM32F031 is an open-source printed circuit board by Caljay, from the Caljay/STM32DevBoard repository on GitHub. It is a 4-layer board of 22 × 27.6 mm with 25 parts on 34 nets, routed with 229 tracks and 23 vias.
It is built around the AP63203WU and SG-210STF. Its parts include 11 capacitors, 4 resistors, 3 connectors, 2 ICs and 2 switches. It belongs with the microcontroller boards boards and the STM32 boards of this library.
Main components
2
AP63203WU
TSOT-23-6-40℃~+85℃@(TA) 1 1.1MHz 22uA 2A 3.3V 3.8V~32V Buck Built-in Fixed Overcurrent Protection、Light load efficient mode、Cycle-by-cycle current limiting、Hiccup current limiting、EMI optimization (spread spectrum) Step-down type Yes TSOT-23-6 DC-DC Converters ROHSDiodes IncorporatedDC-DC Converters
SG-210STF
SMD2520-4P-40℃~+85℃ 1.6V~3.6V 1.8mA 13MHz ±50ppm SMD2520-4P Crystal Oscillators ROHSSeiko EpsonOscillators
README
README.mdSTM32F031 Development Board
A minimal STM32F031 development board designed in a compact form factor while benefitting from the mature ST/STM ecosystem.
Overview
- MCU: STM32F031K6T6 (ARM Cortex-M0, 48MHz, 32KB Flash, 4KB RAM)
- Form factor: A compact fomr factor with 20 total exposed pins
- Programming: SWD interface via exposed header pins + BOOT0 button
- Power: USB-C (5V input) with onboard 3.3V regulation or V_in pin for usage with batteries
- I/O: 14 GPIO pins on 0.1" headers
Pinout
Board pinout from the back. Silkscreening is on the backlayer only.
Getting Started
Hardware needed: Any SWD programmer (ST-Link, J-Link, or a second STM32 running as a programmer)
Entering boot mode: Hold BOOT0 button while applying power
Toolchain: STM32CubeIDE or any ARM GCC toolchain with OpenOCD
See /examples for basic firmware to verify your board is working.
See /docs for full electrical specifications and component details.
Repository Structure
/hardware— KiCad schematic and PCB files/renders— Board and schematic images/docs— Electrical specifications/guidelines, datasheets/examples— Example firmware
These will continue to be updated as more sample programs are tested and run.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 0.1uF | Resistor_SMD:R_0603_1608Metric | C1, C12 |
| 2 | 100nF | Resistor_SMD:R_0603_1608Metric | C2, C5 |
| 2 | 10uF | Resistor_SMD:R_0603_1608Metric | C4, C6 |
| 2 | 1uF | Resistor_SMD:R_0402_1005Metric | C10, C11 |
| 2 | 22uF | Resistor_SMD:R_0603_1608Metric | C7, C8 |
| 2 | 5.1K | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | SW_Push | UltraSmallButton:SW4_PTS815 SJM 250 SMTR LFS_CNK | SW1, SW2 |
| 1 | 10K | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 10nF | Resistor_SMD:R_0603_1608Metric | C9 |
| 1 | 3.3uH | Resistor_SMD:R_0603_1608Metric | L1 |
| 1 | 40K | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | AP63203WU | Package_TO_SOT_SMD:TSOT-23-6 | U2 |
| 1 | GPIO Header 1 | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J6 |
| 1 | GPIO Header 2 | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J2 |
| 1 | MMFTP3160 | MMFTP:P200_SOT-23 | M1 |
| 1 | SG-210STF | Oscillator:Oscillator_SMD_SeikoEpson_SG210-4Pin_2.5x2.0mm | Y1 |
| 1 | STM32F031G4Ux | Package_DFN_QFN:QFN-28_4x4mm_P0.5mm | U3 |
| 1 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_JAE_DX07S016JA1R1500 | J1 |
Questions
How big is the STM32F031 PCB?
It measures 22 × 27.6 mm and has 4 copper layers, 1.33 mm thick.
What parts does the STM32F031 use?
25 parts, built around the AP63203WU and SG-210STF. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the STM32F031 KiCad files?
From the Caljay/STM32DevBoard repository on GitHub, at the commit this page was made from: the board is hardware/STM32F031.kicad_pcb and its schematic hardware/STM32F031.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the STM32F031 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Caljay before reusing the design.
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