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Make a Quadcopter using KK 2.1.5 Flight Controller - KT926

Make a Quadcopter using KK 2.1.5 Flight Controller - KT926


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A quadcopter, also called a quadrotor helicopter or quadrotor, Is a multirotor helicopter that is lifted and propelled by four rotors. Quadcopters are classified as rotorcraft, as opposed to fixed-wing aircraft, because their lift is generated by a set of rotors (vertically oriented propellers).



1) Quadcopter Frame (Preferably one which has a built in Power Distribution board)

2) Microcontroller (KK 2.15 Flight Controller)

3) Electronic Speed Control (30 Amps) (4 pieces)

4) Brushless Motor (850KV) (4 pieces)

5) Propellers (2 sets)

6) Power Distribution Board (Not needed if frame has a built in one)

7) Lithium-Polymer 2300 mAH Battery

8) Fly Sky FS-T6 Controller includes the Receiver



  • A2212/13.RPM/V: 1000KV.Batteries: 2-3 Li-Poly
  • Efficiency: 80%.
  • Current: 4-10A (>75%).
  • No load current: 10V/0.5A.Max.
  • transient current: 12A/60S
  • Shaft diameter: 3.17mm.
  • Dimensions: 27.5*30mm.
  • Weight limit for compatible model plane: 300-900g.
  • Compatible propeller model: APC 10*5/ APC 11*5.5/ APC 10*4.7

KK 2.1 Multi Rotor flight Control board

  • Size: 50.5mm x 50.5mm x 12mm
  • Weight: 21 gram (Inc. Piezo buzzer)
  • IC: Atmega644 PA
  • Gyro/Acc: 6050MPU
  • Auto-level: Yes
  • Input Voltage: 4.8-6.0V
  • AVR interface: standard 6 pin.
  • Signal from Receiver: 1520us (5 channels)
  • Signal to ESC: 1520us
  • Firmware Version 1.6


KK 2.1.5 multi Rotor flight controller Board

KK2.1 Multi-Rotor controller manages the flight of (mostly) multi-rotor Aircraft (Tri copters , Quadcopters, Hex copters etc). Its purpose is to stabilize the aircraft during flight and to do this, it takes signals from on-board gyroscopes (roll, pitch and yaw) and passes these signals to the Atmega324PA processor, which in-turn processes signals according the users selected firmware (e.g. Quadcopter) and passes the control signals to the installed Electronic Speed Controllers (ESCs) and the combination of these signals instructs the ESCs to make fine adjustments to the motors rotational speeds which in-turn stabilizes the craft. The KK2.1 Multi-Rotor control board also uses signals from your radio system via a receiver (Rx) and passes these signals together with stabilization signals to the Atmega324PA IC via the aileron; elevator; throttle and rudder user demand inputs. Once processed, this information is sent to the ESCs which in turn adjust the rotational speed of each motor to control flight orientation (up, down, backwards, forwards, left, right, yaw)


Ensure the negative (black or brown) is orientated so that it is on the pin that is nearest to the edge of the Flight Controller Board, so looking at the board the color sequence will be Black, Red and Orange. The channels are connected as follows from the front of the board towards the push buttons: -

Typical receiver servo connections are:


Connect the ESC’s to the right side of the Flight Controller Board. M1 is towards the front of the board and M8 is nearest to the push buttons. The negative (black or brown) lead towards the edge of the FC. The negative (black or brown) lead is connected to the edge of the Flight Controller. DO NOT MOUNT THE PROPELLERS AT THIS STAGE – FOR SAFETY REASONS

The completed Receiver and Motor wiring (for a QUAD Copter) looks like this:

The Flight Controller Board must always have a source of +5v from an ESC, either one of the motors ESC or from a separate unit feeding the Receiver. If each ESC has a BEC (normal unless OPTO types) then it may be necessary to remove the power feed from the other ESC, usually by cutting the power line (RED) Cable on the other ESC.

STEP-4 Set up a new model on your transmitter and use a normal airplane profile and bind the Receiver to the Transmitter.

Accessing the Leveling Mode

1. You can access the self-levelling mode either from the settings of STICK or AUX channel.
2. When set to AUX Mode you must connect a spare channel usually CH5 or Ch6 and changing the Transmitter switch position will enable/disable Self-Levelling mode.
3. When set to STICK Mode to go into Self-Levelling Mode, you must set the Throttle to Minimum and set maximum Left Rudder whilst at the same time, setting maximum Left Aileron to disable SL or maximum Right Aileron to enable SL.

Flight controller Sound

1. One Beep (short beep, 2 sec delay) is emitted when the board is armed and the throttle is closed, this is for safety reasons so you know it’s armed.
2. One Long Beep is emitted when the board is either Armed or Disarmed.

Status Screen

Displays the message "SAFE" and the KK2 will not arm unless it says "OK".

Status Screen

Error messages can only be reset by cycling the power, except for the "sensors not calibrated" message, which is reset after a successful sensor calibration.
Error messages include lost RX connection.
The KK2.1 has an auto-disarm function and will disarm itself after 20 sec if throttle is at idle. For extra safety. Can be turned on/off in "Mode Settings" menu

Lost Model Alarm

The KK2.1 has a lost aircraft alarm and starts to beep (1 sec on and 4 sec off) after 30min of no activity (arm/disarm).

model Type Supported

Y6 Quadcopter +
Quadcopter X
Hexcopter +
Hexcopter X
Octocopter +
Octocopter X
X8 +
X8 X
Aero 1S Aileron
Aero 2S Aileron
Flying Wing
Singlecopter 2M 2S
Singlecopter 1M 4S


1) Basic soldering skills
2) Alan keys
3) Shrink tubes(Preferably Turnigy)
4) Zip ties (To hold the ESC's onto the frame)
5) Glue gun (To put all over the connections to avoid any contact between them)


1) The motors and ESC's can be connected to each other via direct soldering or using Bullet Connectors of 4mm dimension.

2) The ESC's are then connected to the power distribution board, or in this case directly to the frame which has an inbuilt power distribution board, by soldering. (Make sure to know if the ESC's are supposed to be flashed or not, mine did not required to do so.)

3) Once this is done, solder the battery wire to the frame.

4) Once all the soldering work is done, and the hardware is setup, connect the KK Board(again flashed with the latest firmware) with the ESC servo wires, and Receiver.


If your code is all correct and your connections are all good you should see the LCD screen on the board lit up, from where you can easily calibrate both the Accelerometer and Magnetometer.