Instead of connecting a receiver to my quad copter's can I do something so that I am able to send commands to the flight controller using my android smartphone and WiFi?  

Hey, I need some help to make a surveillance quad-copter with the raspberry pi and pi cam(I'm fine with an arduino also, if it's possible). I plan on controlling it with a mobile phone or a dual shock 4(if possible to somehow connect it to WiFi)via…