This board distributes power to quadcopter ESC's as well as data from the controller. It also serves as a ground link between the controller and the ESC's

It would be cheaper to buy a similar item from but as old Blue Eyes used to say "I did my Way." The final board will avoid the usual maze of cables, and cut it down to two board conectors with two and four cables respectively. Two cales are 5 volt and a ground from the controller APM 2.5 or equivalent and four data cable for rudder, elevator, aileron and throttle.