The Arduino UNO is a microcontroller based on the ATmega328. With 14 Digital I/O pins, a 16MHz crystal oscillator, a USB connection, power jack, ICSP Header, and a reset button, the Arduino UNO has everything a microcontroller needs onboard; simply connect it to a computer or an AC/DC adapter and it's ready to use. New to the Uno compared to its predecessors is that the FTDI USB-to-serial driver has been replaced by an ATmega16U2 (ATmega8U2 up to version R2), which is programmed as a USB-to-serial converter. Specifications: - Microcontroller: ATmega328 - Operating Voltage: 5V - Input Voltage: 7-12 V - Digital I/O Pins: 14 (6x PWM) - Analog Inputs: 6 - DC Current per I/O Pin: 40 mA - DC Current for 3.3V Pin: 50mA - Flash Memory: 32 KB - Bootloader: 0.5 KB - SRAM: 2 KB - EEPROM: 1 KB - Clock Speed: 16 MHz Ask a product question