2009 UNO LENARDO 2560 controller seamlessly mainstream - 4 -way LED indicator ( LED indicator to know the importance in the actual doing projects with this indicator can be used directly working status LED indicates the procedure to facilitate debugging. - DS18B20 temperature sensor interface that can be done to measure the temperature of the experiment this price does not include the DS18B20 Oh needed another shot . - LM35 temperature sensor interface that can be done to measure the temperature of the experiment this price does not include LM35 Oh needed another shot . - 3296 precision adjustable potentiometer analog input port ( can be used for controlling LED brightness turn the steering angle the digital voltage etc. ) - Integrated infrared receiver that can fit any infrared remote control experiments the price also does not include the integrated receiver and needed another shot . - Four digital tube ( using 74HC595 driver provincial IO learning SPI) you can do digital display experiment ( can display temperature voltage counter value etc. ) . - Three separate buttons a reset button the button can do experiments ( HMI ) . - The buzzer sound can be used for experiments . ( Can call the police pronunciation etc. ) - Bluetooth wireless interfaces voice module voice recognition module can be used for wireless communication experiment - Servo interface easy to drive servos - Infrared detection interface easy and infrared docking realization of human traffic statistics etc.