We are building a hobby drone(Quad-coptor) with a camera for footage. So to control the quad, i have been suggested(Web,Here) to use minimum of four channels.For power and for turning etc., So which means i need one channel for every separate task to be done. For eg., if i want to rotate the camera, then i suppose i need the 5th channel and so on..
Now my question would be - i have seen a lot of drones(ardrone, walkera) which are controlled by an Android or an iPhone app. So the wifi used to connect the drones is, single channel or multi-channel? If single channel then how can i control different tasks like to control turning of the quad or camera in different axis?
Also if i want the GPS location from the quad, do i require to have another transmitter?
I am using(Planned to) a Raspberry Pi 2, OpenPilot-CC3D for flight control.
P.S this is my first drone, Kindly show some mercy if i ask/don't understand your comments.