Technical university of mombasa faculty of engineering and technology department of electrical and electronic engineering

3.10 Circuit diagram

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3.11 Assembly 
Assembly begins by attaching a female Dean‟s ultra-plug to the battery and creating matching 
pigtail using the male Deans ultra-plug and some short pieces of 12-gauge wire for each the 
power and ground connections (or alternatively buy a prefabricated pigtail with a male plug). Be 
careful not to cross-wire this; connect the male and female plugs to verify this. Then solder the 
pigtail connection to the appropriate terminals of the power distribution mains on the hub by 
soldering the red wire to positive '+' and the black wire to negative. 
 
Fig 3.20 motor connection and frame assembly 
Next, the ESC's are prepared by soldering three female bullet connectors to each of the three 
(black) wires that will attach the ESC to a motor. Once complete, the arms are attached to the 
hub (with the white arms at the front and the red arms at the back), the motors mounted to the 
arms using the screws provided with the flame wheel kit, an ESC is attached to each arm using 
cable ties and connected to that motor using the bullet connectors. At this time the positive and 
ground wires coming off the ESC can each be trimmed to length and soldered to the appropriate 
terminal points on the PDB. For future reference, the side of the quadcopter containing the white 
arms is designated to be the front and the side with the red arms is the back. This orientation will 
be maintained for the rest of the assembly and beyond. The use of the red and white arms will 
further all us to identify the direction that the quadcopter is pointing when it is far away.

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At this stage, the assembly is just about complete. All that remains is to add the receiver and the 
flight controller and wiring it all together (receiver connects to the left side and motors connect 
to the right side of the KK2 board. The receiver was mounted, using double-sided tape, to one of 
the side panels. In order to mount the flight controller, I simply used the foam padding container 
that it was shipped in by hot gluing the controller board to the padding and gluing the padding to 
the mounting plate on the hub. Using the padding provides the dual benefit of both protecting 
the flight controller from damage (in the event of a rough landing) as well as reducing the 
transmissions of vibrations from the frame to the flight controller. Testing of the receiver and 
the KK2 flight controller can be now be conducted in order to verify that all is working 
correctly. It should be noted that the KK2 gets its power via the ESC on motor 1. Unless motor 
1 is connected (and the battery is attached to the PDB), the flight controller will get no 
power. Once testing of the KK2 is complete and satisfactory, the top plate of the hub can be 
attached.