UNO is a micro controller board based on the ATmega328P.
Plug in the UNO development board and the driver will be installed automatically, simply connect it to a computer with the supplied USB cable or power it with an AC to DC adapter or battery power to get started.
UNO R3 new improvement, the printing on the female connector is clearer, more precise, more convenient to use wires.
Have 14 digital input/output pins six of which can be used as PWM outputs, 6 analogue inputs, a 16 MHZ quartz crystal.
Suitable for simply use the sensor, a variety of electronic components connected (such as: LED lights, buzzers, buttons, photoresistors, etc).