Arduino UNO R3 User Manual (English)

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Arduino® UNO R3

4 / 13 Arduino® UNO R3 / Rev. 01 - 25/11/2021

1 The Board

1.1 Application Examples

The UNO board is the ﬂagship product of Arduino. Regardless if you are new to the world of electronics or will use

the UNO as a tool for education purposes or industry-related tasks.

First entry to electronics: If this is your ﬁrst project within coding and electronics, get started with our most used

and documented board; Arduino UNO. It is equipped with the well-known ATmega328P processor, 14 digital

input/output pins, 6 analog inputs, USB connections, ICSP header and reset button. This board includes everything

you will need for a great ﬁrst experience with Arduino.

Industry-standard development board: Using the Arduino UNO board in industries, there are a range of

companies using the UNO board as the brain for their PLC’s.

Education purposes: Although the UNO board has been with us for about ten years, it is still widely used for

various education purposes and scientiﬁc projects. The board's high standard and top quality performance makes

it a great resource to capture real time from sensors and to trigger complex laboratory equipment to mention a

few examples.

1.2 Related Products

Starter Kit

Tinkerkit Braccio Robot

Example

2 Ratings

2.1 Recommended Operating Conditions

Symbol Description Min Max

Conservative thermal limits for the whole board: -40 °C (-40°F) 85 °C ( 185°F)

NOTE: In extreme temperatures, EEPROM, voltage regulator, and the crystal oscillator, might not

work as expected due to the extreme temperature conditions

Need help?

Do you have a question about the Arduino UNO R3 and is the answer not in the manual?

Arduino UNO R3 Specifications

General

Microcontroller	ATmega328P
Operating Voltage	5V
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
LED_BUILTIN	13
Length	68.6 mm
Width	53.4 mm
Weight	25 g