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> Multi-Rotors, Drones & Parts > Flight Controllers & Accessories > Flight Controllers


Hobbyking KK2.1.5 Multi-rotor LCD Flight Control Board With 6050MPU And Atmel 644PA

Hobbyking KK2.1.5 Multi-rotor LCD Flight Control Board With 6050MPU And Atmel 644PA
Hobbyking KK2.1.5 Multi-rotor LCD Flight Control Board With 6050MPU And Atmel 644PA

The next evolution of the rotor revolution is here!! The KK2.1.5 is packing new found power with updated sensors, memory and header pins.

The KK2.1.5 is next big evolution of the first generation KK flight control boards. The KK2.1.5 was engineered from the ground up to bring multi-rotor flight to everyone, not just the experts. The LCD screen and built in software makes install and setup easier than ever. A host of multi-rotor craft types are pre-installed, simply select your craft type, check motor layout/propeller direction, calibrate your ESCs and radio and you’re ready to go! All of which is done with easy to follow on screen prompts!

The original KK gyro system has been updated to an incredibly sensitive 6050 MPU system making this the most stable KK board ever and allowing for the addition of an auto-level function. At the heart of the KK2.1.5 is an Atmel Mega644PA 8-bit AVR RISC-based microcontroller with 64k of memory. An additional polarity protected header has been added for voltage detection, so no need for on-board soldering. A handy piezo buzzer is also included for audio warning when activating and deactivating the board.

The KK2.1.5 added polarity protection to the voltage sense header and a fuse protected buzzer outputs, in case something is accidentally plugged in incorrectly. The voltage sense line has been updated for better accuracy. The board is clearly labeled and the voltage sense line color has been changed to red for easy identification, making installation and connections a snap.

If you’re new to multi-rotor flight or have been unsure about how to setup a KK board then the KK2.1.5 was built for you. The 6 Pin USBasp AVR programming interface ensures future software updates will be quick and easy.

Size: 50.5mm x 50.5mm x 12mm
Weight: 21 gram (Inc Piezo buzzer)
IC: Atmega644 PA
Gyro/Acc: 6050MPU InvenSense Inc.
Auto-level: Yes
Input Voltage: 4.8-6.0V
AVR interface: standard 6 pin.
Signal from Receiver: 1520us (5 channels)
Signal to ESC1520us

Firmware Version: 1.6:
Pre-installed firmware.
Quadcopter +
Quadcopter X
Hexcopter +
Hexcopter X
Octocopter +
Octocopter X
X8 +
X8 X
Singlecopter 2M 2S
Singlecopter 1M 4S

(Custom Mix via the "Mixer Editor" option)

The Mixer Editor allows you to adjust where and how much signal the motors receive from stick input and sensors. This allows you to create any configuration possible with up to 8 motors or servos.

What is a Multi-Rotor Control board you ask?

The HobbyKing KK2.1.5 Multi-Rotor controller is a flight control board for multi-rotor aircraft (Tricopters, Quadcopters, Hexcopters etc). Its purpose is to stabilize the aircraft during flight. To do this it takes the signal from the 6050MPU gyro/acc (roll, pitch and yaw) then passes the signal to the Atmega644PA IC. The Atmega644PA IC unit then processes these signals according the users selected firmware and passes control signals to the installed Electronic Speed Controllers (ESCs). These signals instruct the ESCs to make fine adjustments to the motors rotational speed which in turn stabilizes your multi-rotor craft.

The HobbyKing KK2.1.5 Multi-Rotor control board also uses signals from your radio systems receiver (Rx) and passes these signals to the Atmega644PA IC via the aileron, elevator, throttle and rudder inputs. Once this information has been processed the IC will send varying signals to the ESCs which in turn adjust the rotational speed of each motor to induce controlled flight (up, down, backwards, forwards, left, right, yaw). 

** Note: It is all ways recommended to update to the latest software version as part of your initial setup.(this is different than v1.6 for 2.0) 

PRODUCT ID: 9171000446-0

Shipped from:
International Warehouse



  • HobbyKing Sticker Sheet - Multirotor

    Combo Price: $0.45   IN STOCK
    Add to Cart

  • 3cm Male to Male Servo Lead 26AWG (10pcs/set)

    Combo Price: $4.14   IN STOCK
    Add to Cart

  • OrangeRx R617XL cPPM DSM2/DSMX Compatible 6ch Receiver

    Combo Price: $8.36   IN STOCK
    Add to Cart

  • Hobbyking SK450 Glass Fiber Quadcopter Frame 450mm

    Combo Price: $16.95   IN STOCK
    Add to Cart

  • ZYX-S DSM2/DSMJ Compatible Satellite Receiver Cable

    Combo Price: $3.43   BACKORDER
    Add to Cart

  • Y Adapter For KK2.0 KK2.1 and Naze32 Super Bright LED and Buzzer

    Combo Price: $1.95   IN STOCK
    Add to Cart

  • KK2.0/ Naze 32 Super Bright Status and Alarm LED

    Combo Price: $7.95   IN STOCK
    Add to Cart

Further discounts available for registered & logged-in customers.
 Customer rated
Total of 850 discussions.
volodimir  7 points - 9/15/2016
Hobbyking KK2.1.5. On M2 confused power pole ( , - instead of -, ). I stopped working. Where can I find the circuit. What to do.
RonRC  4445 points - 9/12/2016
These boards are great for just about any multirotor application you can think of. Here, I used my Beerlift hex to fly around a Ghoul for Halloween last year. Ha ha!
karthik  1 points - 9/10/2016
Hello , I want to the source code of the firmware updated in this site. I am looking to add Pheripherals to my quadcopter which is using KK board 2.1.5 .I could'nt find the source code anywhere else.
 R. J. 30 points
you can find the firmware under the files tab of the kk2.1.5 product page (international warehouse). The .hex file in the .zip is the compiled firmware, you will need the development environment for Atmel ATMEGA644p to compile the source code. I suggest using the latest v1.19 firmware. The firmware is written in assembler. Good luck!
 karthik 1 points
Got it ! ....Thanks but i think it will be better to have the embedded c codes for ATMEGA 644PA which i can use to fine tune the gains of PID . Thanks in advance!
shadbolt  22 points - 8/22/2016
Hi guys, am part way through building a quad copter. after powering up and doing all the pre setup stuff, I connected all inputs and outputs. On connecting the battery, the screen lit then went blank. Any suggestions? Also now if I power it up from a Rx battery, after approx 30 seconds, a warning beep and shuts down. Leaving a lit screen, no writing on it.
 R. J. 30 points
make sure your input and output signal wires from the servo wire points toward the display (the wires have ground, positive and signal, usually colored black, red, white or brown, red, orange. So on the left side should be black, red, white and on the right side the opposite way, white, red, black. Test your board by connecting only the first output to an ESC that provides BEC and check if it powers up correctly and shows safe mode on the screen. Have you accidently connected power to your receiver? If it doesn't power up and shuts down you will have to open up an rma for your controller.
Stuart  1 points - 8/18/2016
I am building a quadcopter using the KK2.1.5 controller and four Afro 30A ESCs. The KK2.1.5 manual indicates that all cables from the first ESC should connect into M1 in order to provide signalling and power to the first bus (i.e. which is used by the controller itself). Similarly, the manual states that all cables from the second ESC should connect into M2 to provide signalling and power to the second bus* the second bus powers servos on M5-8. For the third and fourth ESCs which will be connected to M3 and M4 the manual states that if SWITCHED BECs are being used then the red ( VE) cable should be disconnected. So my first question is: do Afro 30A ESCs have switched or linear BECs and if they are of the linear type do I still have to disconnect red on M3 and M4? Note I have read the Afro manual and it does not state the BEC type (my best guess is linear). My second question is how do I power my receiver - will power be "passed through" the controller board or will I have to power it separately? If I have to power it separately then I assume I could take positive and negative cables from either the ESC attached to M3 or M4 as a source? Thanks in advance, Stuart
 R. J. 30 points
Hi! many questions: as I remember (I researched this a long time ago) most ESCs with BEC are switched, you can find it out when all ESCs are connected to the KK2.1.5 and power it up, in idle mode, each ESC will make a beep followed by a silent delay. When the ESCs get out of rythem, the beeps come not all at the same time, you will have switched BECs inside the ESCs (as most ESCs have). For a quadcopter no servos are needed, so you would only need power on M1, the power on M1 is also passed through to power your receiver. I haven't disconnected the of the Afro ESCs through M2 to M4 and had no problems so far (slowflyer)... Do not give this to much attention, as long you are not going for highspeed aerobatics you will be fine with connected of all ESCs... The reason for the beeps not to come at the same time is, that the first ESC has to power the controller and receiver while the other ESCs have no load. Because of this, for the first ESC one loop is minimal longer than the others and therefore not running synchronized.
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Tiny changes over KK2.1 and not that much different from KK2.0, but a really great board all around that is so easy to set up and performs well too. Thanks HK for making it available to the masses :)

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very good item.. kk2.1 board> some oscillation but kk2.1.5 board> same condition > not oscillation.....

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Great to have all connectors prepopulated and voltage reversal protection is finally here - less chance of smoke.

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great help for beginners in the hobby lots of instructions available on youtube for setup and use well tried and tested flight controller , works great

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