This project is a custom PCB design based on an STM32 microcontroller. It includes USB power input, SWD programming interface, and an onboard MC6470 6-axis sensor (accelerometer + magnetometer). The goal of this board is to create a compact and reliable platform for motion and orientation sensing experiments.
The schematic is organized into several functional sections:
- The board is powered through a USB Type-C connector (5V input).
- An adjustable LDO regulator generates the 3.3V rail for the microcontroller and sensors.
- A power LED indicates when the board is active.
- Proper decoupling capacitors are used to ensure voltage stability.
- The main component is an STM32 microcontroller.
- External 8 MHz crystal oscillator ensures stable clock operation.
- Decoupling capacitors and VCAP pins are placed according to the STM32 hardware design guidelines.
- NRST circuit includes a pull-up resistor and a filtering capacitor for reliable startup.
- A standard SWD header is included for firmware upload and debugging.
- Signals: SWCLK, SWDIO, NRST, VCC, and GND.
- Compatible with ST-Link and similar programmers.
- The MC6470 combines a 3-axis accelerometer and a 3-axis magnetometer.
- Communication with the MCU is through the I²C bus (SCL and SDA).
- Interrupt outputs (INTA, INTM) are connected to GPIO pins.
- TM and PM pins are grounded for stability as mentioned in the datasheet.
- The sensor has local decoupling capacitors for noise suppression.
- Electrical Characteristics
- Input Voltage: 5V (via USB)
- Operating Voltage: 3.3V
- Communication Interface: I²C
- Programming Interface: SWD
This board is designed for academic and experimental use. It can be used for projects involving motion sensing, embedded systems development, and sensor data acquisition using STM32.
- Altium Designer: for schematic and PCB design
- Git & GitHub: for version control and documentation
- STM32CubeIDE: for firmware development
