• This board is your entry to the unique Arduino experience: great for learning the basics of how sensors and actuators work, and an essential tool for your rapid prototyping needs
• Arduino UNO Rev3 is the most used and documented board in the world
• “Uno” means one in Italian and was chosen to mark the release of Arduino Software (IDE) 1.0, now evolved to newer releases  en.wikipedia.org
• It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button
• Arduino is an open-source hardware, software, and content platform with a worldwide community of over 30 million active users

ARDUINO UNO R3 Board

Microcontroller: ATmega328P
Operating Voltage: 5v
Input Voltage (recommended): 7-12V
Input Voltage (limits): 6-20V
Digital IO Pins: 4 (of which 6 provide PWM output)
Analog Input Pins: 6
DC Current per IO Pin: 40mA
DC Current for 3.3V Pin: 50mA
Flash Memory: 32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM: 2 KB
EEPROM: 1 KB
Clock Speed: 16 MHz