Flight Controllers

The flight controller (FC) is the central processing unit of your drone. It reads sensor data and adjusts motor speeds many times per second to keep the drone stable.

How It Works

1. The gyroscope measures angular velocity on all three axes
2. The accelerometer measures linear acceleration
3. The PID controller calculates the correction needed
4. Motor outputs are updated at 8 kHz (or higher on F7 processors)

Popular Firmware

Processor Tiers

• F4 (STM32F405) — solid performance, widely supported
• F7 (STM32F745) — faster, supports higher loop rates
• H7 (STM32H743) — top-tier, used in professional builds

Choosing an FC

For beginners: look for an F4 or F7 with built-in OSD, barometer, and Bluetooth for wireless configuration via the SpeedyBee app.