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My main requirements for this project were cost and FlySky transmitter compatibility. I didn't want to have to buy a new $80+ transmitter. One bonus of using this flight control board and receiver combination is that it uses PWM so there are only 3 wires from the FCB to the receiver. Another bonus of using the FlySky protocol is that the cheap WLToys V939 transmitter available for <$20 is compatible and pairs with the FCB. That means the total would come to around $75 if you have absolutely no quadcopter hardware and that includes the transmitter, flight control board, receiver board, 4 motors, 4 batteries with a charger, and 10 pairs of propellers. I had the majority of the hardware on hand so it only put me out $25. See the bill of material below.