ArduPilot: Open source flight control APM and PIXHAWK (schematic and source code)

    APM (ArduPilotMega) is a flight control product launched by the DIY Drones community in 2007. It is the most mature open source hardware project today. APM is based on the Arduino open source platform and has made improvements to many hardware, including an accelerometer, gyroscope and magnetometer combined inertial measurement unit (IMU). Due to the good customizability of APM, through the open source software Mission Planner, developers can configure the settings of the APM, accept and display sensor data. At present, APM flight control has become a mature benchmark for open source flight control, which can support unmanned equipment such as multi-rotors, fixed wings, helicopters and unmanned vehicles. For multi-rotor, APM flight control supports various four-, six-, and eight-axis products, and can increase stability after being connected to an external GPS sensor, and complete a variety of flights such as autonomous takeoff and landing, autonomous route flight, homecoming, altitude fixing, and fixed point. model. APM can connect external ultrasonic sensors and optical flow sensors to achieve fixed height and fixed point flight indoors.

Features include:
free open source firmware, supporting aircraft ("ArduPlane"), multi-rotors (quadrotor, hexacopter, octocopter, etc.), helicopters ("ArduCopter") and ground vehicles ("ArduRover")!
Simple through point-and-click tools Set up and upload firmware. No programming required! (But if you want to do some coding, you can use a simple embedded programming tool: Arduino)