Flight Controller Design 2

Flight Controller Prototype Overview

This is an early-stage prototype for a custom-built flight controller based on the STM32H750VBT7. The board is designed to interface with key flight sensors including an IMU, magnetometer, and barometer, and to provide PWM output signals for motor control. Communication with all sensors is handled via SPI.

Microcontroller

• MCU: STM32H750VBT7 (Cortex-M7 @ 480 MHz, 128 KB RAM, 1 MB Flash)
• Crystal: 16 MHz external crystal oscillator

• • Load Capacitors: 2 × 10 pF

Sensors (via SPI)

1. Magnetometer: LIS3MDL

• Interface: SPI
• Connections:
• • SCK  → Pin 1
  • MISO → Pin 4
  • MOSI → Pin 5
  • CS   → Pin 3
  • DRDY → Pin 2

2. IMU: ICM-20602 (6-axis accelerometer + gyroscope)

• Interface: SPI
• Connections:

• • SCK  → Pin 29
  • MISO → Pin 30
  • MOSI → Pin 31
  • CS   → Pin 28
  • DRDY → Pin 33

3. Barometer: MS560702BA03-50

• Interface: SPI
• Connections:

• • SCK  → Pin 78
  • MISO → Pin 79
  • MOSI → Pin 80
  • CS   → Pin 77
  • DRDY → Not Connected (X)

Outputs & Control

PWM Outputs

• PWM 1 → Pin 22
• PWM 2 → Pin 23
• PWM 3 → Pin 24
• PWM 4 → Pin 25

SPI / GPIO Control Pins

• GPIO 1 → Pin 40
• SPI NSS  → Pin 51
• GPIO 2    → Pin 52
• SPI MISO → Pin 53
• SPI MOSI → Pin 54

I2C Interface

• SCL → Pin 46
• SDA → Pin 47

Power & Ground

• VIN: (Power input pin)
• GND: Multiple ground pins (x10) for stable electrical grounding