2 layers68 × 40 mm
Stm32-io extend
hardenedlinux/cheap-pcb
Cheap PCB: Better understanding the current status of hardware supply chain
44 parts170CC0-1.0
2 layers41 × 31 mm
Custom STM32F103C8T6 dev board with native USB, UART/I²C headers, and SWD programming . Designed in KiCad as part of a guided Udemy course.
- Size
- 41 × 31 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 50
- Pads
- 132
- Tracks, vias
- 196, 22
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 Oct 2026
- Updated
- 6 Oct 2026
Overview
STM32 is an open-source printed circuit board by elsa-ao, from the elsa-ao/STM32-Project repository on GitHub. It is a 2-layer board of 41 × 31 mm with 32 parts on 50 nets, routed with 196 tracks and 22 vias.
It is built around the STM32F103C8T6 and AMS1117-3.3. Its parts include 13 capacitors, 5 resistors, 4 connectors, 2 ICs and 1 diode. It belongs with the interfaces and adapters and microcontroller boards boards and the STM32 boards of this library.
Main components
2
STM32F103C8T6
LQFP-48(7x7)-40℃~+85℃ 12bit 20KB 2V~3.6V 32 Bit 37 64KB 72MHz ARM Cortex-M3 Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdSTM32F103C8T6 Custom Dev Board
Custom STM32F103C8T6 USB dev board, designed from scratch in STM32CubeMX (pinout) and KiCad (schematic + PCB), following Phil's STM32 Udemy course.
Features
- STM32F103C8T6, powered over USB (AMS1117-3.3 regulator)
- Native USB device (Micro-B connector)
- UART and I²C broken out to headers
- SWD header for programming/debugging
- 16MHz crystal, BOOT0 select switch, power LED
Repository structure
stm32-udemy-project/
├── cubemx/ # STM32CubeMX .ioc project
├── kicad/ # KiCad schematic + PCB
└── docs/ # Exported images/rendersParts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100n | Capacitor_SMD:C_0402_1005Metric | C4, C6, C7, C9, C10 |
| 4 | 1k5 | Resistor_SMD:R_0402_1005Metric | R1, R3, R4, R5 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1, J2, J3 |
| 2 | 10pF | Capacitor_SMD:C_0402_1005Metric | C5, C8 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C12, C13 |
| 2 | 22uF | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C11 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 120R | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | 16MHz Crystal_GND24 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | R | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | RED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | STM32F103C8T6 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U2 |
| 1 | SW_SPDT | Button_Switch_SMD:SW_SPDT_PCM12 | 01 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Wuerth_629105150521 | J4 |
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Questions
How big is the STM32 PCB?
It measures 41 × 31 mm and has 2 copper layers, 1.6 mm thick.
What parts does the STM32 use?
32 parts, built around the STM32F103C8T6 and AMS1117-3.3. 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 STM32 KiCad files?
From the elsa-ao/STM32-Project repository on GitHub, at the commit this page was made from: the board is kicad/STM32.kicad_pcb and its schematic kicad/STM32.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the STM32 design in my own project?
Its repository states no licence, so its author keeps all rights: ask elsa-ao before reusing the design.