Block Diagram of Quadcopter.. Setup and Tuning of KK2.1.5 Flight Controller. Kk2.1.5 multi rotor LCD flight controller board is built on ATML644 PA. Right hand side of board has 8 outputs of which we will be using four only output to connect ESCs directly. We are going to use quad copter so we have used only four output pins.. The KK2.1 is a very popular flight controller as its cheap, works well, and does not need a PC to configure thanks to its built in LCD screen! This guide will provide links to the various manuals, and useful videos and links to help you get started with your KK2.1 flight controller. Before you start, the most important thing is to make sure you connect the battery correctly on the KK2.1 boards.
Connections on the flight controller from the top to bottom are as follows. Aileron; Elevator; Throttle; Rudder; Auxiliary - On this flight controller it is used to turn the self level on and off . In my case, using a HobbyKing transmitter and receiver, the diagram below shows how it is connected, Channel 1-5 connected in the same way.. 1 x KK2.1.5 Flight Controller. 1 x Transmitter. 1 x Receiver. 1-3 x 2-4s LiPo Batteries. For a Plane, you will need: 1 x X2212-13 KV Motor (Available at www.rcsunnysky.com) 2 x 25 Amp ESCs that support 2-4s LiPo battery packs. 2 x KK2.1.5 Flight Controllers. 2 x Transmitters. 2 x Receivers. 1-3 x 2-4s LiPo Batteries