The Role of the Flight Controller
The flight controller (FC) runs the flight firmware (Betaflight, PX4, ArduPilot), reads IMU sensors 1000-8000 times per second, runs PID control loops, and sends motor signals to ESCs. It also manages OSD, Blackbox logging, serial peripherals, and failsafe behaviors.
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MCU Comparison: F4 vs F7 vs H7
F4 (168MHz Cortex-M4): sufficient for 5" FPV at 4-8kHz loop. F7 (216MHz Cortex-M7 with D-Cache): handles digital HD VTX, RPM filtering, and 8-16kHz loops. H7 (480MHz Cortex-M7): dual IMU, heavy Blackbox logging, complex autonomous missions, and ROS 2 companion link.
Sensor Quality Matters
Gyro choice affects flight feel: ICM-42688P (low noise, modern), BMI270 (good), MPU6000 (legacy but reliable). Dual IMU provides redundancy for enterprise. Barometer (DPS310/BMP388) for altitude hold. Magnetometer (HMC5883/QMC5883) for GPS heading.
FC Features Checklist
Count UARTs (6+ for complex builds), check for 5V/9V BEC, Blackbox flash (16MB+), OSD chip, LED strip output, camera control, Bluetooth (config without USB), and USB-C. For enterprise: CAN ports, dual IMU, current sensor, and vibration isolation.
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