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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 852 discussions.
khlee  10 points - 10/21/2016
I have two KK2.1.5. One of KK2.1.5 gets no receiver signal at all. Other KK2.1.5 gets ch1 and ch2 only. I know that receiver is bound correctly. I checked it using servo connecting directly to the receiver. How can I fix this problem? Anyone knows what's wrong?
Mert Serdar  4 points - 10/5/2016
Hi everyone I've a problem with my kk2.1 board. The setting values got stuck on it and now I can't change them. If I want to enter a new value, it simply turns back to old one. I tried everything, tried factory reset, re-cycle the power, but none of them worked. I googled it but also I found nothing. Did anyone faced this issue before and has any comment for solution?
 Gabriel 2 points
Have you tried re-flashing the firmware with this tool?
 Mert Serdar 4 points
Yeap, I tried and failed, when I start flashing procedure, at the beginning everything looks cool but then when it finishes all pre loading and reading card and starts to write the new firmware it just halts with error with red writing... I dont remember what was it saying now... I guess it was mentioning that firmware was not okay and something was about 0x000, which is nonsense btw, because firmware was also correct. At the moment card just acts as it is read-only and because of that I gave up on it and switched to CC3D. But I'll appriciate if anyone found a solution for that and share with me. I checked it on google and just found one case which was the same, but it was written in a forum in german, also as far as I understood he did not find any solution. ( I really suck to understand german, so maybe I missed something, I dont know)
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.
 R. J. 30 points
You can find the manual under the files tab (purple button) above the discussions on the right side. When you look at the picture of the KK2.1.5 you can see over the connectors on the left side - 5V S printed on the board and stands for minus, plus, signal. Left connectors go to your receiver. On the right side you connect the servo plugs of your ESCs in the direction signal, plus, minus. The signal wires points always towards to the display. On the back of the board you can identify the input and output connectors (out1 to out8 to the ESCs and Rud, Ail, Ele and Thr to your receiver. Hope that helps you out, good luck!
RonRC  4450 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!
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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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