?GoolRC Mini KK2.15 Case Shell Flight Control Board with LED Light Screen for Quadopter Multicopter<br> Feature：<br> More Silk screening has been added to delineate polarity and functionality<br> Ground is now pulled from the Escs， which provides better reverse voltage protection.<br> Diode protection has been added to the buzzer to avoid damaging the board if you plug in power to the buzzer<br> Improvements have been added to the voltage sense accuracy<br> <br> If you fly aggressive acro， this is firmware for you! If you are a beginner or you don't need advanced control， please see my Lite firmware listing<br> <br> The KK2.1.5 is packing new found power with updated sensors， memory and header pins.<br> 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!<br> 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.<br> 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.<br> 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.<br> Designed by the grandfather of the KK revolution， Rolf R Bakke， the KK2.1.5 is the evolution of the first generation KK flight control boards. The KK2.1 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!<br> <br> Specifications:<br> Size: 40 * 40 * 15mm (Piezo buzzer not included)<br> IC: Atmega644 PA<br> Gyro/Acc: 6050MPU InvenSense Inc.<br> Auto-level: Yes<br> Input Voltage: 4.8-6.0V<br> AVR interface: standard 6 pin<br> Signal from Receiver: 1520us (8 channels)<br> <br> Package Information:<br> Package size: 10 * 6 * 2cm/4 * 2.4 * 0.8in<br> Package weight: 24g/0.8oz<br> Adheive taps package<br> <br> Package List:<br> 1 * KK2.15 Control Board<br> 1 * Buzzer<br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>