Arduino Uno R3 is a micro-controller. it is the board based micro-controller on the ATmega328. it has digital and analog pins. it consists of 14 digital input/output pins. 6 pins can be used as PWM output. Arduino u3 also contains 6 analog pins. Arduino has 16 Mhz ceramic resonators, a USB connection, a power jack, an ICSP header, and a header. it also contains a reset button. it contains everything needed to support the controller. to use the micro-controller, connect the computer with a USB cable. for the power, it uses an AC-to-DC adapter or battery. Arduino Uno price is reasonable at Module.pk.