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Hi there, I've just built myself pretty much the same thing as what you have, kk2.1.5, hobby king 6ch transmitter. Each channel of the receiver has 3 pins, 2 of these are 5v 0v, which it will then power itself from the flight controller. The input marked BAT was used to bind the transmitter...

Picked up one of these to learn to fly, very impressed with it I have to say! Camera is lacking though, but what do you expect for that price!