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Arduino Uno

The Uno was the first prototyping board produced by Arduino, and it is now on its third revision (hence the name Arduino Uno R3).

Arduino Uno R3

Technical specs

Feature Value
Microcontroller ATmega328P
Operating Voltage 5 V
Input Voltage (recommended) 7-12V
Input Voltage (limit) 6-20V
Digital I/O Pins 14 (of which 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 used by bootloader
SRAM 2 KB (ATmega328P)
EEPROM 1 KB (ATmega328P)
Clock Speed 16 MHz
Length 68.6 mm
Width 53.4 mm
Weight 25 g

Arduino Uno Arduino Uno

ATMega328 ATMega328