Arduino: Arduino Uno based on Atmel AVR ATmega328 MCU

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Kit Overview

The Arduino Uno is a microcontroller board based on the ATmega328ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, 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.

The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.

Revision 2 of the Uno board (A000046A000046) has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.

Revision 3 of the board (A000066A000066) has the following new features:

1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the Arduino Due that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
Stronger RESET circuit.
Atmega16U2 replace the 8U2

Ordering option:

Part Number	Description
A000046A000046	Revision 2 of the Arduino Uno board
A000066A000066	Revision 3 of the Arduino Uno board

Key Applications: Building Automation, Industrial Automation.

More Development Kits and Tools
	More Atmel Development Kits		Atmel Overview
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Development Tools

Software Development Tools:

Tool Type	Supplier	MPN	Supported Family	Description
IDE	Atmel	Atmel Studio 6	ALL AVR	Atmel Studio 6 Integrated Development Environment (IDE) is the integrated development environment (IDE) for developing and debugging Atmel ARM Cortex-M and Atmel AVR microcontroller (MCU) based applications. The Atmel Studio 6 IDE gives you a seamless and easy-to-use environment to write, build and debug your applications written in C/C++ or assembly code. Learn More
RTOS	Micrium	Micrium uc/OSIII	AVR / AVR32	μC/OS-III is Micrium’s newest RTOS, designed for developers who need to save time on their current and next embedded sytem projects. Learn More
RTOS	Segger	embOS	AVR32	SEGGER embOS (Real Time Operating System) follows strict, yet efficient coding and documentation standards. embOS is a priority-controlled real time operating system, designed to be used as foundation for the development of embedded real-time applications. Learn More

Tool Type

Supplier

MPN

Supported Family

Description

IDE

Atmel

Atmel Studio 6

ALL AVR

Atmel Studio 6 Integrated Development Environment (IDE) is the integrated development environment (IDE) for developing and debugging Atmel ARM Cortex-M and Atmel AVR microcontroller (MCU) based applications. The Atmel Studio 6 IDE gives you a seamless and easy-to-use environment to write, build and debug your applications written in C/C++ or assembly code. Learn More

RTOS

Micrium

Micrium uc/OSIII

AVR / AVR32

μC/OS-III is Micrium’s newest RTOS, designed for developers who need to save time on their current and next embedded sytem projects. Learn More

RTOS

Segger

embOS

AVR32

SEGGER embOS (Real Time Operating System) follows strict, yet efficient coding and documentation standards. embOS is a priority-controlled real time operating system, designed to be used as foundation for the development of embedded real-time applications. Learn More

Hardware Development Tools:

Tool Type	Supplier	MPN	Supported Family	Description
Debuggers, Emulators & JTAG Tools	Atmel	ATAVRDRAGONATAVRDRAGON	AVR UC3 / AVR XMEGA / megaAVR / tinyAVR	AVR Dragon JTAG Debugger Starter Kit for for 8-bit and 32-bit AVR devices
Debuggers, Emulators & JTAG Tools	Atmel	ATAVRONEKITATAVRONEKIT	AVR UC3 / AVR XMEGA / megaAVR / tinyAVR	AVR ONE! professional development tool for all Atmel 8-bit and 32-bit AVR devices
Debuggers, Emulators & JTAG Tools	Atmel	ATJTAGICE2ATJTAGICE2	AVR UC3 / AVR XMEGA / megaAVR / tinyAVR	AVR JTAGICE mkII mid-range development tool for Atmel 8-bit and 32-bit AVR devices
Debuggers, Emulators & JTAG Tools	Atmel	ATAVRISP2ATAVRISP2	AVR XMEGA / megaAVR / tinyAVR	AVRISP mkII Programmer for field upgrades of Atmel 8-bit AVR microcontrollers with ISP or PDI interfaces

Technical Documents

Learning Center

Type	Description
Application Note	Atmel: TV Control Touch Keyboard
Application Note	Atmel: Digital Filters with AVR
Application Note	Atmel: Understanding ADC parameters
Application Note	Atmel: LED Driver Library for 8-bit AVR

Design Elements

Type	Description
Schematics	Arduino: Uno schematic_Rev3
Reference Design	Arduino: Uno Reference Design_Rev3
Code Snippet	Arduino: SCP1000 Barometric Pressure Sensor Display
Code Snippet	Arduino: Sample Code for Digital Pot Control
Code Snippet	Arduino: Sample Code for Servo Library