The Arduino Nano is a small, complete, breadboard-friendly board based on the ATMega328P (Arduino Nano 3.x). It has more or less the same functionality as of the Arduino Duemilanove, but in a different package. It lacks the DC power jack and works with a Micro USB cable instead of a 'Type B' one.

Features:

• Microcontroller: ATmega328
• Architecture: AVR
• Operating Voltage: 5V
• Flash Memory: 32KB of which 2 KB used by bootloader
• SRAM:  2KB
• Clock Speed: 16 MHz.
• AIO Pins: 8
• DIO Pins: 22 (6 of which are PWM)
• EEPROM: 1KB
• Max DC Current per I/O Pins: 40 mA (I/O Pins)
• Input Voltage: 1.8-5.5V
• PCB Size: 18 x 45mm