This flight controller uses the data gathered by the sensors to calculate the desired speed for each of the four motors. The flight controller sends this desired speed to the Electronic Speed Controllers (ESC’s), which translates this desired speed into a signal that the motors can understand.
 
This flight controller
The APM 2.8 Multicopter Flight Controller is a complete open source autopilot system. This is the best-selling technology that won the prestigious Outback Challenge UAV competition.
 
It allows the user to turn any fixed, rotary-wing. In addition, it turns multirotor vehicles (even cars and boats) into a fully autonomous vehicle. meanwhile, it is capable of performing programmed GPS missions with waypoints.