Description

Arduino Uno Board using the original design.

Microcontroller
ATmega328P
USB connector
USB-B
Pins
Built-in LED Pin    13
Digital I/O Pins    14
Analog input pins    6
PWM pins    6
Communication
UART    Yes
I2C    Yes
SPI    Yes
Power
I/O Voltage    5V
Input voltage (nominal)    7-12V
DC Current per I/O Pin    20 mA
Power Supply Connector    Barrel Plug
Clock speed
Main Processor    ATmega328P 16 MHz
USB-Serial Processor    ATmega16U2 16 MHz
Memory
ATmega328P    2KB SRAM, 32KB FLASH, 1KB EEPROM