Arduino Uno R3 is a micro controller-based development board. Arduino UNO and other boards can read inputs – light on a sensor, a finger on a button, or a Twitter message – and turn it into an output – activating a motor, turning on an LED, publishing something online by utilizing this R3 kit. You can tell your Arduino UNO r3 what to do by sending a set of instructions to the micro controller on the board. To do so you use the Arduino programming language (based on Wiring), and the Arduino Software (IDE), based on Processing.