dRehmFlight
Teensy/Arduino flight controller & stabilization for small-scale VTOL
...Its primary hardware platform uses a Teensy 4.0 microcontroller and an MPU6050 six-axis IMU. Features include receiver input handling, IMU calibration, ESC calibration, motor arming, and customizable control logic. Because the code is easy to edit in the Arduino ecosystem, experimental aircraft behaviors can be added quickly. The project is intended mainly for education and rapid prototyping rather than commercial flight-control deployment.