Arduino Duemilanove

Overview
The Arduino Duemilanove ("2009") is a microcontroller board based on the ATmega168 or ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.

"Duemilanove" means 2009 in Italian and is named after the year of its release.

Summary

 * Microcontroller: ATmega168 or ATmega328
 * Operating Voltage: 5V
 * Input Voltage (recommended): 7-12V
 * Input Voltage (limits): 6-20V
 * Digital I/O Pins: 14 (of which 6 provide PWM output)
 * Analog Input Pins: 6
 * DC Current per I/O Pin: 40 mA
 * DC Current for 3.3V Pin: 50 mA
 * Flash Memory: 16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader
 * SRAM: 1 KB (ATmega168) or 2 KB (ATmega328)
 * EEPROM: 512 bytes (ATmega168) or 1 KB (ATmega328)
 * Clock Speed: 16 MHz

Schematic & Reference Design

 * EAGLE files
 * Schematic