KK 2.1.5  is a flight controller board which is use in drone. This board is use to control all the process in drone movement sensing all the process control by this board. This board contains many sensors, firmware and microcontroller. For to choose any flight controller board so it is too important to know the features of the board if we talk about KK 2.1.5 flight controller board  Microcontroller:
ATmega644PA microcontroller has used in this board its a eight bit and it supports AVR
 Firmware: Its a type of software which is use to make communication between hardware and software to communicate. 
Sensor: In KK 2.1.5 MPU6050 Gyroscope and Accelerometer  has used  Gyroscope is type of sensor which is work on Angular velocity and Accelerometer is a type of sensor which is used to measure the acceleration of any body .MPU6050 helps up to measure velocity, orientation, acceleration, displacement and other motion like features.
Communication protocol:  This board has already an LCD display and four switches for the controlling process.
Input voltage: Its input voltage is 4.8 to 6.0V
Features
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Its most stable  board
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Its  6060MPU based.
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Easy graphical interfacing
- Its easy to use for the beginners 
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It has inbuilt firmware
Specification
| Model | KK 2.1.5 |
| Type | Controller board for drone |
| Processor | ATMEGA |
| Auto level | YES |
| Input voltage | 4.8 to 6V |
| AVR interface | Standard six pins |
| Signal to ESC | 1520Microsecond |
| Signal from receiver | 1520 Microsecond  |
| Country of Origin | China |
