“Uno” means one in Italian and was chosen to mark the release of Arduino Software (IDE) 1.0. The Uno board and version 1.0 of Arduino Software (IDE) were the reference versions of Arduino, now evolved into newer releases. The Uno board is the first in a series of USB Arduino boards and serves as the reference model for the Arduino platform; for an extensive list of current, past, or outdated boards, see the Arduino index of boards.

Tech Specs 

• Microcontroller: ATmega328P

• Operating Voltage: 5V

• Input Voltage (Recommended): 7-12V

• Input Voltage (Limit): 6-20V

• Digital I/O Pins: 14 (6 provide PWM output)

• PWM Digital I/O Pins: 6

• Analog Input Pins: 6

• DC Current per I/O Pin: 20 mA

• DC Current for 3.3V Pin: 50 mA

• Flash Memory: 32 KB (ATmega328P), of which 0.5 KB is used by bootloader

• SRAM: 2 KB (ATmega328P)

• EEPROM: 1 KB (ATmega328P)

• Clock Speed: 16 MHz

• LED_BUILTIN: 13

• Length: 68.6 mm

• Width: 53.4 mm

• Weight: 25 g