2 layers100 × 66 mm
Ecocar on boarding Rev4
elamey413/EcoCar_Onboarding
Here is my onboarding project for EcoCar. It is a STM32F103C8T6 based PCB that is able to measure several important data points for drone flying.
52 parts1
2 layers43 × 33 mm
Hardware design files for a custom STM32 development board created in KiCad.
- Size
- 43 × 33 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 39
- Nets
- 51
- Pads
- 165
- Tracks, vias
- 305, 37
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Apr 2026
- Updated
- 7 Apr 2026
Overview
STM32 is an open-source printed circuit board by Adityasc9, from the Adityasc9/STM32-Custom-PCB repository on GitHub. It is a 2-layer board of 43 × 33 mm with 39 parts on 51 nets, routed with 305 tracks and 37 vias.
It is built around the STM32F103C8T6, BME280 and AMS1117-3.3, with the USBLC6-2SC6 among its other parts. Its parts include 14 capacitors, 7 resistors, 4 ICs, 1 diode and 1 connector. It belongs with the STM32 boards of this library.
Main components
4
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)
BME280
LGA-8(2.5x2.5)-40℃~+85℃ 0%RH~100%RH 1.71V~3.6V 1.8uA 16bit I2C、SPI ±0.5℃ ±3%RH LGA-8(2.5x2.5) Temperature and Humidity Sensor ROHSBoschTemperature And Humidity Sensor
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
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
README
README.mdSTM32F103 Custom Development Board
Overview
This project is a custom-designed, general-purpose development board based on the STM32F103C8T6 (ARM Cortex-M3). Designed in KiCad, this 2-layer PCB serves as a robust platform for embedded firmware development, featuring integrated environmental sensing and high-speed USB connectivity.
Key Features
- Microcontroller: STM32F103C8T6 (Cortex-M3) running at 72MHz.
- Power Management: Onboard AMS1117-3.3V LDO regulator powered via USB-C (VBUS) or external headers.
- Integrated Sensing: Onboard BME280 sensor for high-precision temperature, humidity, and pressure monitoring via I2C.
- Clocking: 16MHz external crystal oscillator with matched 10pF load capacitors for high-precision timing.
- Connectivity Headers:
- UART for real-time debugging and telemetry.
- SWD (Serial Wire Debug) for programming and JTAG emulation.
- SPI and I2C expansion rails for external sensor integration.
- USB-C interface for 5V power and USB 2.0 data.
Hardware Design & Signal Integrity
- USB Differential Pairs: Routed USB D+/D- as matched-length traces over a continuous ground plane to minimize return current loop area, following USB 2.0 signal integrity guidelines.
- Noise Mitigation: Utilized a Ferrite Bead (FB1) on the 3.3V rail to isolate high-frequency noise from sensitive analog components.
- DFM Readiness: Enforced strict component spacing and clearance constraints for pick-and-place compatibility.
- Documentation: Successfully generated complete Gerber, BOM, and CPL files for automated PCBA submission.
Technical Specifications
| Feature | Component / Protocol |
|---|---|
| MCU | STM32F103C8T6 (Cortex-M3) |
| Input Voltage | 5V (VBUS) |
| Regulated Voltage | 3.3V (AMS1117) |
| ESD Protection | USBLC6-2SC6 |
| PCB Layers | 2-Layer FR4 |
| Interface | USB-C (USB 2.0) |
Firmware & Toolchain
The board is fully compatible with the STM32CubeIDE ecosystem. Projects have been validated using bare-metal C to interface with the BME280 sensor and handle interrupt-driven state machines for USB HID communication.
Repository Structure
/3d_models: USB 3d_model used./Manufacturing: Gerber files, BOM, and Pick-and-Place (CPL) data./Images: Images of Schematic, 3D Renders, and Assembled PCB.
Parts
39| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C9 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 1k5 | Resistor_SMD:R_0402_1005Metric | R5, R6, R7 |
| 3 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | I2C, SWD, UART |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R8 |
| 2 | 10p | Capacitor_SMD:C_0402_1005Metric | C10, C11 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C7, C8 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric | C12, C13 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 1 | 0.1u | Capacitor_SMD:C_0402_1005Metric | C14 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | 16MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U4 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | SPI |
| 1 | FerriteBead | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | LOGO | LOGO | G*** |
| 1 | STM32F103C8T6 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SW_SPDT | Button_Switch_THT:SW_Slide_SPDT_Straight_CK_OS102011MS2Q | SW1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4110 | J1 |
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Questions
How big is the STM32 PCB?
It measures 43 × 33 mm and has 2 copper layers, 1.6 mm thick.
What parts does the STM32 use?
39 parts, built around the STM32F103C8T6, BME280, AMS1117-3.3 and USBLC6-2SC6. 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 Adityasc9/STM32-Custom-PCB repository on GitHub, at the commit this page was made from: the board is STM32.kicad_pcb and its schematic 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 Adityasc9 before reusing the design.