How do I build a flight controller from scratch?

To create a flight controller from scratch, you'll need to design and develop a system that can stabilize and control an aircraft. This involves selecting suitable hardware components such as microcontrollers, sensors (e.g., gyroscopes, accelerometers, barometers), and communication modules. You'll also need to develop or implement flight control algorithms, such as PID controllers, to process sensor data and adjust the aircraft's actuators accordingly. Consider using open-source flight control software as a reference or starting point.