UNO Rev 3-board

UNO Rev 3

The Arduino UNO is the best board to get started with electronics and coding. If this is your first experience tinkering with the platform, the UNO is the most robust board you can start playing with. The UNO is the most used and documented board of the whole Arduino family.


Arduino Uno is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. You can tinker with your Uno without worrying too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again.


The classic high-performance, low-power AVR® microcontroller.

Replaceable chip

The ATmega328P can easily be replaced, as it is not soldered to the board.


The ATmega328P also features 1kb of EEPROM, a memory which is not erased when powered off.

Battery Connector

The Arduino UNO features a barrel plug connector, that works great with a standard 9V battery.


First Steps

Quickstart Guide
All you need to know to get started with your new Arduino board.

Suggested Libraries

This library allows you to communicate with I2C / TWI devices.
The SPI library allows you to communicate with SPI devices, with the Arduino as the controller device.
The Servo library allows an Arduino board to control RC (hobby) servo motors.

Arduino Basics

Built-in Examples
Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands.
In Foundations you can find some specific knowledge about the principles and techniques that are behind the Arduino.
Language References
Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.


Interactive Viewer

Interact with the schematics, the PCB and a 3D model of the product.

Pinout Diagram

A diagram showing the functions and the arrangement of the pins on your product.