The flight controller connects everything else on your drone and keeps them all working towards one singular goal, making sure your flight goes smoothly. From distributing the power to various peripherals to calculating just how smooth your next juicy flick will be. Your FPV Drone's flight controller is always at work whenever you are in flight. The processor in a drone FC will choose how quickly it can process information, as well as how much information can be processed at once. And the number of UARTs decides how many peripherals you can attach at one time. An added barometer will allow you to gather extra data.