During the time of the end of 2014 to beginning of 2015 I was greatly fascinated with quadcopters and programming of microcontrollers. When I created the libk I also created bettercopter as an application example for building a quadcopter flight controller firmware based on libk. I eventually did other things in 2015, so I never finished this project.
Bettercopter was my first venture into the world of quadcopters and into the mechanics behind them. I prefer to see it as a leraning experience.