Companion Computers are small, powerful computing devices (often ARM-based SBCs like Raspberry Pi, NVIDIA Jetson, or ODroid) that connect to a flight controller via the MAVLink protocol to extend drone capabilities. They receive telemetry data (GPS, sensor readings, flight status) and can execute advanced logic such as autonomous navigation, AI-based object detection, or sensor fusion.

These systems combine hardware (the SBC and peripherals) with software frameworks that process MAVLink data and control actuators or onboard systems.

Typical Workflow:

1. Connect to Flight Controller – Use serial, USB, or network interfaces to establish MAVLink communication.

2. Receive Telemetry – Parse GPS, attitude, and sensor data in real-time.

3. Process Data – Apply algorithms (e.g., AI inference, mapping, or decision-making).

4. Send Commands – Control servos, trigger cameras, or adjust flight paths.

Example: Using MAVSDK in Python