Arduino Uno Hardware Manual Web Links

11 January 2019

On this page are web links from the Arduino Uno Hardware Manual for easy access to referenced websites. Find the main Arduino website at www.arduino.cc

Scroll down to find the chapter and section that contains the link that you are looking for, or use the links directly below to jump to the desired chapter on this page.

Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | Chapter 5 | Chapter 6 | Chapter 7 | Chapter 8

Chapter 1

1.1.3 Uses of the Arduino Uno

Wiring project wiring.org.co

Arduino Project Hub create.arduino.cc/projecthub

1.1.4.11 ICSP Header

Those readers interested in learning the C language to program Arduino boards may be interested in the book C Programming with Arduino ISBN 978-1-907920-46-2

1.1.5 Programming

The Arduino IDE is free to download from www.arduino.cc/en/Main/Software

1.1.6.5 Custom PCB

KiCad (kicad-pcb.org) is an open-source EDA (Electronic Design Automation) software package that can be used to draw circuit diagrams and lay out PCBs.

1.1.7 Open-Source and Licensing

See creativecommons.org/licenses/ for more information on the various Creative Commons licenses.

For more details, see the page www.arduino.cc/en/Trademark on the Arduino website.

1.1.8 Third Party Compatible Boards

For more information on the various spin-off boards including official boards, clones, derivatives, compatibles and even counterfeits, see the article blog.arduino.cc/2013/07/10/send-in-the-clones/ on the Arduino blog.

1.1.9 Build Quality, Warranty and Safety

A full list of official Arduino boards can be found at www.arduino.cc/en/Main/Products on the Arduino website.

For more information on Arduino board compliance and for the warranty statement, see www.arduino.cc/en/Main/warranty

1.2.1 USB Bridge Firmware

The ATmega16U2 microcontroller and its firmware replaces the FT232RL USB to UART bridge chip from FTDI (www.ftdichip.com) found on older Arduino boards (the Arduino Duemilanove www.arduino.cc/en/Main/arduinoBoardDuemilanove for example).

1.4 Arduino Uno History and Revisions

Readers who would like more information, see startingelectronics.org/articles/arduino/uno-r3-r2-differences/ for a full list of the differences between R1, R2 and R3 Arduino Uno boards.

1.6.1 Installing Software

Help documentation on installing the Arduino IDE software is available for Windows, MAC OS X and Linux. Follow the links below for your operating system.

1.6.1.1 Windows

www.arduino.cc/en/Guide/Windows

1.6.1.2 MAC OS X

www.arduino.cc/en/Guide/MacOSX

1.6.1.3 Linux

www.arduino.cc/en/Guide/Linux

1.6.2 Getting Started, Examples and Reference

Getting started guides, examples and a software reference are all available on the Arduino website. Getting started guides and examples are a great way for new Arduino users to learn about building projects with Arduino and learning to write sketches.

1.6.2.1 Getting Started Guides

Links to getting started guides for any Arduino board can be found at:
www.arduino.cc/en/Guide/HomePage

Arduino Uno specific getting started guide:
www.arduino.cc/en/Guide/ArduinoUno

1.6.2.2 Arduino Examples and Tutorials

An index to tutorials and examples at www.arduino.cc/en/Tutorial/HomePage on the Arduino website provides links to various categories.

1.6.2.3 Building Breadboard Circuits

A tutorial series at startingelectronics.org/beginners/start-electronics-now/ shows how to build breadboard circuits with some Arduino examples.

1.6.2.4 Arduino Software Reference

Arduino language and library reference: www.arduino.cc/reference/en/

1.6.3 Getting Help

Find the Arduino FAQ (Frequently Asked Questions) at www.arduino.cc/en/Main/FAQ

Problems and solutions can be found on the Arduino Troubleshooting page at
www.arduino.cc/en/Guide/Troubleshooting

The Arduino wiki at playground.arduino.cc/ is a user contributed collection of documentation and other useful information.

The Arduino Forum at forum.arduino.cc is a place where anyone can post a question that will be answered by community members. The forum can also be searched for other user’s questions which may already have answers. It is also a place where more experienced Arduino users can help others by answering questions.

1.6.4 Related Open-Source Projects

1.6.4.1 Fritzing

Fritzing, found at fritzing.org on the web, provide a software package that can be used to draw Arduino breadboard circuits and then turn them into custom made printed circuit boards or PCBs.

1.6.4.2 Wiring

Find the Wiring project at wiring.org.co on the web.

1.6.4.3 Processing

Processing, found at processing.org on the web, is a programming language based on Java, and a software package for developing applications on a computer.

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For more information, see www.arduino.cc/en/Tutorial/PhysicalPixel on the Arduino website.

1.6.5 Arduino Uno Boards on the Web

Links to the web pages on the Arduino website for the Arduino Uno and Arduino Uno SMD boards follow.

1.6.5.1 Arduino Uno Web Page

Find the Arduino Uno web page at store.arduino.cc/arduino-uno-rev3 which includes basic technical information and links to the circuit diagram and board build files in electronic format.

1.6.5.2 Arduino Uno SMD Web Page

Go to store.arduino.cc/arduino-uno-smd-rev3 for the newest information on the Arduino Uno SMD, or to www.arduino.cc/en/Main/ArduinoBoardUnoSMD for the Arduino Uno SMD board page on the Arduino website. An electronic copy of the circuit diagram for the Arduino Uno SMD can be found here as well as the build files.

Chapter 2

2.2 Atmel, Microchip and AVR

Microchip (www.microchip.com)

2.3.3.1 EEPROM Programming

Refer to the library reference www.arduino.cc/en/Reference/EEPROM for more information on using the EEPROM in sketches.

2.3.4.1 SD Cards (SPI Interface)

See www.arduino.cc/en/Reference/SD for more information on the Arduino SD card library.

2.3.4.3 SPI Devices

See the library reference www.arduino.cc/en/Reference/SPI for more information on the SPI library.

2.3.4.4 TWI and I²C Devices

See the library reference www.arduino.cc/en/Reference/Wire for more information on the Wire library.

2.7.5.1 Analog In Example Sketch

The corresponding tutorial page for the AnalogReadSerial example sketch can be found at www.arduino.cc/en/Tutorial/AnalogReadSerial on the Arduino website, which shows how to connect a potentiometer to A0 to vary the voltage on this pin.

2.7.6 AREF Pin

For more information on the analogReference() function, see www.arduino.cc/reference/en/language/functions/analog-io/analogreference/

2.8.3 ATmega16u2 ICSP Header

More information on DFU programming can be found at www.arduino.cc/en/Hacking/DFUProgramming8U2 on the Arduino website and in section 5.1 of chapter 5 of this book.

2.8.4 ICSP Programming Resources

The following links provide more information on the AVRISP mkII, Atmel Studio and C programming of Arduino boards using Atmel Studio. Also see chapter 5.

AVRISP mkII – www.microchip.com/developmenttools/ProductDetails/atavrisp2

Atmel Studio – www.microchip.com/mplab/avr-support/atmel-studio-7

C Programming – wspublishing.net/avr-c/

2.8.5 Using an Arduino as an In-System Programmer

Find more information on the Arduino website at www.arduino.cc/en/Tutorial/ArduinoISP

Chapter 3

3.2.2 ATmega328P Alternate Pin Functions

More information on each pin function can be found in the ATmega328 datasheet from the page www.microchip.com/wwwproducts/en/ATmega328P on the Microchip website.

3.3.1.1 Pins as Outputs
Switching Heavier Loads with Transistors and Relays

For more details on interfacing Arduino boards and microcontrollers, refer to the appropriate texts or other sources such as the Interfacing With Hardware page playground.arduino.cc/Main/InterfacingWithHardware in the playground area on the Arduino website.

3.3.1.2 Pins as Inputs
Pull-down Resistor

Find the tutorial page at www.arduino.cc/en/Tutorial/DigitalReadSerial on the Arduino website.

3.3.4.2 Accessing TWI Devices in Software

This means including the Wire.h header file in a sketch and using the Wire library object and functions found in the reference www.arduino.cc/en/Reference/Wire on the Arduino website.

3.3.5.2 Accessing SPI Devices in Software

Use the SPI object and functions from www.arduino.cc/en/Reference/SPI – the SPI reference page on the Arduino website.

3.3.5.3 Accessing SD Cards in Software

Go to www.arduino.cc/en/Reference/SD to find the SD card reference on the Arduino website.

3.3.6.1 Hardware Serial Port

Go to www.arduino.cc/reference/en/language/functions/communication/serial/ for the serial port library reference.

3.3.6.2 Software Serial Port

Go to www.arduino.cc/en/Reference/SoftwareSerial on the Arduino website for more information on the SoftwareSerial library.

3.7 Finding the Datasheets

3.7.1 ATmega328P Datasheet

Find the ATmega328P datasheet at www.microchip.com/wwwproducts/en/ATmega328p on the Microchip website.

3.7.2 ATmega16U2 Datasheet

Go to www.microchip.com/wwwproducts/en/ATmega16u2 to find the datasheet for the ATmega16u2 microcontroller used as the USB to serial bridge chip on Arduino Uno boards.

Chapter 4

No links.

Chapter 5

5.1 Updating the USB to Serial Bridge Firmware using DFU

For Windows computers, download the FLIP (Flexible In-system Programmer) software from Microchip at www.microchip.com/developmenttools/ProductDetails/FLIP

For additional information on Arduino DFU programming and for DFU programming using Linux and Mac, see www.arduino.cc/en/Hacking/DFUProgramming8U2 on the Arduino website.

5.2 Atmel Studio

Table 5.1: Microchip USB Programmers for AVR Microcontrollers
USB ProgrammerPart NumberWeb Page
AVRISP mkIIatavrisp2www.microchip.com/developmenttools/ProductDetails/atavrisp2
AVR DragonATAVRDRAGONwww.microchip.com/Developmenttools/ProductDetails/ATAVRDRAGON
Atmel-ICEatatmel-icewww.microchip.com/developmenttools/ProductDetails/atatmel-ice

To install Atmel Studio, go to www.microchip.com/mplab/avr-support/atmel-studio-7 on the Microchip website.

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Go to wspublishing.net/avr-c/installing-atmel-studio-7/ for instructions with screen captures that shows how to install Atmel Studio in detail.

5.3.2 DFU Bootloader Firmware

At GitHub github.com/arduino/ArduinoCore-avr/tree/master/firmwares/atmegaxxu2/arduino-usbdfu is the link to the same source code.

5.3.3 USB to Serial Bridge Firmware

The same source code and HEX files can be found on GitHub at github.com/arduino/ArduinoCore-avr/tree/master/firmwares/atmegaxxu2/arduino-usbserial which contains the latest version of this code and HEX files.

5.4.2 Optiboot Bootloader Firmware

The same files can be found at github.com/arduino/ArduinoCore-avr/tree/master/bootloaders/optiboot on GitHub.

The Optiboot project on GitHub is at github.com/Optiboot/optiboot

Optiboot wiki can be found at github.com/Optiboot/optiboot/wiki

See github.com/Optiboot/optiboot/wiki/HowOptibootWorks for more details.

5.6 Alternative Firmware Programming Methods

Alternative methods for programming the bootloader to an Arduino Uno can be found at playground.arduino.cc/Main/ArduinoCoreHardware#Bootloader at the Arduino playground under the Bootloader section.

Using an Arduino as an ISP (In-system programmer) is also described on the Arduino website at www.arduino.cc/en/Tutorial/ArduinoISP

Refer to www.arduino.cc/en/Hacking/DFUProgramming8U2 for additional information on DFU programming the ATmega16u2.

Chapter 6

6.4 Getting an Electronic Copy of the Circuit Diagram

Find the circuit diagram in PDF format, and the circuit diagram and PCB design file in Eagle format at store.arduino.cc/arduino-uno-rev3 for the Arduino Uno. Look under the DOCUMENTATION tab for these files.

To view the files in Eagle format, the Eagle EDA software package will need to be downloaded from www.autodesk.com/products/eagle/free-download and installed.

Chapter 7

7.4 Waveform Patterns and Measurement

PicoScope 2000 series digital PC oscilloscope, model number 2205A used for oscilloscope measurements.

Chapter 8

8.7 Using Strip-board as a Shield

See startingelectronics.org/projects/arduino-projects/arduino-tiny-stripboard-shield/ for an example of fitting a piece of strip-board to an Arduino Uno using only three of the header sockets on the Arduino. An example project that uses the strip-board shield can be found at startingelectronics.org/projects/arduino-projects/arduino-tiny-temperature-shield/

8.8 Drill Template and KiCad Template

The drill template file as well as the KiCad template file can be found on the Resources page of this website.

The KiCad software package can be found at kicad-pcb.org where it can be downloaded free of charge and unrestricted.

Arduino Uno Hardware Manual