Ultimate Arduino MEGA 2560 Hardware Manual Best Resources

Resources for the Ultimate Arduino MEGA 2560 Hardware Manual can be found on this page, including web links, Arduino sketches from the book, and downloads. Report and find errata for the book at the bottom of this page. Either scroll down the page to find what you are looking for, or expand the table of contents below and click a link to jump to the desired section. The main sections on this page are:

  • Downloads: Links to the downloadable files from the book
  • Web Links: All of the websites referenced in the book in an easy to click format
  • Arduino Sketches: Code for all the sketches in the book in an easy to copy format
  • Errata: Check errata for the book or report any errors that you found in the book
Table of Contents

Ultimate Arduino MEGA 2560 Hardware Manual Downloads

Find the downloads for the Ultimate Arduino MEGA 2560 Hardware Manual below. They include a PDF drill template file for the Arduino MEGA 2560 board, and KiCad template files.

PDF Drill Template File from the Ultimate Arduino MEGA 2560 Hardware Manual

The drill template file: arduino-mega-2560-drill-template.pdf
To save, right-click the link and choose Save Link As (or similar menu item, depending on browser) from the menu that pops up.

Important: Be sure to print the drill template file using a 1:1 scale (or 100%), so that the template is not resized. After printing the template to a page, measure the 1cm or 1 inch markings to make sure that the page printed to scale.

KiCad Template File from the Ultimate Arduino MEGA 2560 Hardware Manual

KiCad template file for Arduino MEGA 2560 and Arduino MEGA 2560 shield: arduino-mega-2560-kicad-template_1_1.zip

The KiCad template files were created using KiCad version 5.1.5 and need to be unzipped from the downloaded zip file before opening with KiCad. The template contains schematic and board files with the Arduino MEGA 2560 R3 header sockets and drill holes placed in the correct positions on the board, ready for starting a new shield or Arduino board project.

Below are web links from the Ultimate Arduino MEGA 2560 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 table of contents near the top of this page to jump to the desired chapter on this page.

1.1.3 Uses of the Arduino MEGA 2560

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/software

1.1.6.2 Prototype Shields

Figure 1.8 on the next page shows the Arduino MEGA PROTO shield REV3 that has the product code A000080 (store.arduino.cc/arduino-mega-proto-shield-rev3-pcb).

Prototype shields with the Arduino Uno form factor are also available, such as the PROTO Shield REV3, product code TSX00083 (store.arduino.cc/proto-shield-rev3-uno-size).

1.1.6.5 Custom PCB

KiCad (www.kicad.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 (ftdichip.com) found on the original Arduino MEGA before the Arduino MEGA 2560.

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/macOS

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

Arduino MEGA 2560 specific getting started guide:
www.arduino.cc/en/Guide/ArduinoMega2560

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 Help Center at support.arduino.cc/hc/en-us

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.

1.6.4.1 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.

…

Find the PhysicalPixel tutorial on the Arduino website at www.arduino.cc/en/Tutorial/BuiltInExamples/PhysicalPixel

1.6.5 Arduino MEGA 2560 on the Web

Find the Arduino MEGA 2560 web page at store.arduino.cc/arduino-mega-2560-rev3 which includes basic technical information and links to the circuit diagram (schematic) and board build files in electronic format.

1.7.1 Arduino DUE vs. Arduino MEGA 2560

More information on the Arduino DUE can be found at store.arduino.cc/arduino-due

1.7.2 Arduino MEGA ADK vs. Arduino MEGA 2560

For more information on the Arduino MEGA ADK, see store.arduino.cc/arduino-mega-adk-rev3

2.2 Atmel, Microchip and AVR

Microchip (www.microchip.com)

2.3.3.1 EEPROM Programming

www.arduino.cc/en/Reference/EEPROM is the library reference for using the EEPROM in sketches.

2.3.4.1 SD Cards (SPI Interface)

www.arduino.cc/en/Reference/SDCardNotes contains more information from Arduino on using SD cards.

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/BuiltInExamples/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 on the Arduino website at www.arduino.cc/en/Hacking/DFUProgramming8U2 and in section 5.1 of chapter 5 of this book.

2.8.4 ICSP Programming Resources

The links that follow provide more information on the Atmel-ICE, Microchip Studio and C programming of Arduino boards using Microchip Studio. Also see chapter 5. Links to older Atmel/Microchip programmers that are now redundant are also listed for interest.

Atmel-ICE – www.microchip.com/DevelopmentTools/ProductDetails/atatmel-ice

Microchip Studio – www.microchip.com/en-us/development-tools-tools-and-software/microchip-studio-for-avr-and-sam-devices

C Programming – wspublishing.net/avr-c/

Redundant no longer for sale programmers:

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

JTAGICE3 – www.microchip.com/DevelopmentTools/ProductDetails/PartNO/ATJTAGICE3

2.8.5 Using an Arduino as an In-System Programmer

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

2.9.4 ICSP SPI Pins and Reset

When using the SPI bus, the SS pin (pin 53) must be kept as an output or the SPI interface will not work, as specified at www.arduino.cc/en/Reference/Ethernet for use with the Ethernet shield.

3.2.2 ATmega2560 Alternate Pin Functions

More information on each pin function can be found in the ATmega2560 datasheet from the page www.microchip.com/wwwproducts/en/ATmega2560 on the Microchip website.

3.3.1 Digital Input / Output Pins

3.3.1.1 Pins as Outputs
Switching Heavier Loads with Transistors and Relays

The ON Semiconductor (www.onsemi.com) datasheet for a PN2222 shows the absolute maximum collector current of this device to be 600mA which means that it can safely and reliably switch a load of between 100mA to about 400mA, which enables it to be used with a number of small DC devices. It could even be used to drive a device that draws up to 500mA if needed.

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.

3.3.1.1 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/BuiltInExamples/DigitalReadSerial on the Arduino website.

3.3.2 PWM Pins

( Taken from: www.arduino.cc/reference/en/language/functions/analog-io/analogwrite/ )

3.3.3 Analog Pins

Refer to www.arduino.cc/reference/en/language/functions/analog-io/analogread/ for information on using the analogRead() function to read values from the analog input pins.

3.3.4.2 Accessing TWI Devices in Software

Use the Wire library in a sketch to access TWI bus devices by 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
Using Serial Port 1, Serial Port 2 and Serial Port 3

Basic Breakout (www.sparkfun.com/products/9716). Again, TX and RX are crossed, and GND is connected between the Arduino and adapter boards.

Click the download link on the Tera Term home page at ttssh2.osdn.jp/index.html.en which will take you to a page with a link to the latest version of Tera Term.

Serial Port Reference

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.

3.3.10 AREF Pin

The Arduino documentation at www.arduino.cc/reference/en/language/functions/analog-io/analogreference/ gives the input voltage range of the AREF pin as 0V to 5V, however the ATmega2560 datasheet gives the AREF voltage range as 1V to 5V.

3.8 Finding the Datasheets

3.8.1 ATmega2560 Datasheet

Find the ATmega2560 datasheet at www.microchip.com/wwwproducts/en/ATmega2560 on the Microchip website.

3.8.2 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 MEGA 2560 boards.

4.1.1 Operating Voltage

STMicroelectronics (www.st.com)

ON Semiconductor (www.onsemi.com)

Diodes Incorporated (www.diodes.com)

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 Microchip Studio

Find more information about the Atmel-ICE at www.microchip.com/developmenttools/ProductDetails/atatmel-ice on the Microchip website.

To install Microchip Studio, go to www.microchip.com/en-us/development-tools-tools-and-software/microchip-studio-for-avr-and-sam-devices on the Microchip website.

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 Bootloader Firmware – stk500v2

The same files can be found at github.com/arduino/ArduinoCore-avr/tree/master/bootloaders/stk500v2 on GitHub.

5.5 The RESET-EN Solder Jumper

For the Atmel-ICE, this information can be found in the Atmel-ICE User Guide that is available for download from the Microchip website at www.microchip.com/DevelopmentTools/ProductDetails/atatmel-ice

5.6 Alternative Firmware Programming Methods

Using an Arduino as an ISP (In-system programmer) is 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.

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-mega-2560-rev3 for the Arduino MEGA 2560. 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.

7.4 Waveform Patterns and Measurement

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

8.8 Drill Template and KiCad Template

The drill template file as well as the KiCad template file can be found at the top of this page.

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

9.5.2 Ethernet Shield Example

Information on this shield can be found at: store.arduino.cc/arduino-ethernet-shield-2

Arduino Sketches for the Ultimate Arduino MEGA 2560 Hardware Manual

Arduino Sketches from the Ultimate Arduino MEGA 2560 Hardware Manual can be found below. Select the desired sketch and copy the code, then paste it to the Arduino IDE. Sketches are displayed below under the section number that they occur in in the book, with the page number that they can be found on.

1.5.2.2 Loading a Test Sketch, Page 51

Modified Blink sketch.

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);     // Configure L LED pin as output
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);  // Switch L LED ON
  delay(200);                       // Leave L LED ON for period
  digitalWrite(LED_BUILTIN, LOW);   // Switch L LED OFF
  delay(200);                       // Leave L LED OFF for period
}

2.7.4.1 Output Pins, Page 79

Arduino MEGA 2560 pin 12 configured as an output and driven high and low.

void setup() {
  pinMode(12, OUTPUT);    // Configure digital pin 12 as an output pin
}

void loop() {
  digitalWrite(12, HIGH); // Set pin 12 voltage to 5V on a MEGA 2560
  delay(500);
  digitalWrite(12, LOW);  // Set pin 12 voltage to 0V or GND
  delay(500);
}

2.7.4.1 Output Pins, Page 80

Defining a pin with a user friendly name.

#define MY_LED  12

void setup() {
  pinMode(MY_LED, OUTPUT);    // Configure digital pin as an output pin
}

void loop() {
  digitalWrite(MY_LED, HIGH); // Set pin voltage to 5V on a MEGA 2560
  delay(500);
  digitalWrite(MY_LED, LOW);  // Set pin voltage to 0V or GND
  delay(500);
}

2.7.4.4 PWM Pins, Page 83

Arduino MEGA 2560 PWM on pin 3 with 50% duty cycle.

void setup() {
  pinMode(3, OUTPUT);

  analogWrite(3, 127);
}

void loop() {
}

2.7.5.3 Calculating Analog In Voltage, Page 88

Calculating analog input voltage on Arduino MEGA 2560 A0 pin.

void setup() {
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(A0);                     // Read ADC value
  float voltage = (5.0 / 1024.0) * (float)sensorValue;  // Calculate voltage
  Serial.print(voltage);                                // Display voltage
  Serial.println(" V");
  delay(1);
}

2.7.5.4 Analog In Pins Used as Digital I/O, Page 89

Arduino MEGA 2560 analog pin A0 used as a digital output pin.

void setup() {
  pinMode(A0, OUTPUT);
}

void loop() {
  digitalWrite(A0, HIGH);
  delay(500);
  digitalWrite(A0, LOW);
  delay(500);
}

3.3.1.2 Pins as Inputs, Page 120

Pull-down Resistor

Read Arduino MEGA 2560 pin 2 state with pull-down resistor.

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(2, INPUT);
}

void loop() {
  if (digitalRead(2)) {
    // Pin state is high or 1, switch is closed (pull-down resistor)
    digitalWrite(LED_BUILTIN, HIGH);  // Switch L LED on
  }
  else {
    // Pin state is low or 0, switch is open (pull-down resistor)
    digitalWrite(LED_BUILTIN, LOW);   // Switch L LED off
  }
}

3.3.1.2 Pins as Inputs, Page 121

Pull-up Resistor

Read Arduino MEGA 2560 pin 2 state with pull-up resistor.

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(2, INPUT);
}

void loop() {
  if (digitalRead(2)) {
    // Pin state is high or 1, switch is open (pull-up resistor)
    digitalWrite(LED_BUILTIN, LOW);    // Switch L LED off
  }
  else {
    // Pin state is low or 0, switch is closed (pull-up resistor)
    digitalWrite(LED_BUILTIN, HIGH);   // Switch L LED on
  }
}

3.3.1.2 Pins as Inputs, Page 122

Internal Pull-up Resistors

Read Arduino MEGA 2560 pin 2 state with internal pull-up resistor enabled.

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(2, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(2)) {
    // Pin state is high or 1, switch is open (pull-up resistor)
    digitalWrite(LED_BUILTIN, LOW);    // Switch L LED off
  }
  else {
    // Pin state is low or 0, switch is closed (pull-up resistor)
    digitalWrite(LED_BUILTIN, HIGH);   // Switch L LED on
  }
}

3.3.4.2 Accessing TWI Devices in Software, Page 127

Read the first byte from an AT24C16C EEPROM connected to the Arduino MEGA 2560 TWI bus pins.

// Reads a single byte from a AT24C16C EEPROM on the TWI or I2C bus
#include <Wire.h>

void setup() {
  Wire.begin();         // Join TWI bus as a master
  Serial.begin(9600);   // For displaying results in Serial Monitor window
  
  // *** Perform Random Read ***
  // Address byte 0 of EEPROM
  Wire.beginTransmission((0xA0 >> 1));
  Wire.write(0x00);
  Wire.endTransmission();
  // Read 1 byte from EEPROM at address 0
  Wire.requestFrom((0xA0 >> 1), 1);
  // *** End Perform Random Read ***

  while (Wire.available()) {          // Check for response from EEPROM
    byte data8 = Wire.read();         // Read byte from the EEPROM
    Serial.print("Byte read is: ");
    Serial.println(data8, HEX);       // Display the byte
  }
}

void loop() {
}

3.3.6.1 Hardware Serial Ports, Page 132

Using the USB Port / Serial Port 0

Sketch that echos back data to the Serial Monitor window of the Arduino IDE after being sent to the Arduino MEGA 2560.

serial_echo sketch on USB Port / Serial Port 0 (TX0 and RX0)

void setup() {
  Serial.begin(9600);               // Initialize serial port 0
}

void loop() {
  if (Serial.available()) {         // Check if character received
    char rx_char = Serial.read();   // Read the character
    Serial.print("Received: ");     // Transmit a string
    Serial.println(rx_char);        // Transmit the received character
  }
}

Using Serial Port 1, Serial Port 2 and Serial Port 3

The same sketch as above can be used to test serial ports 1 to 3 with a small modification as shown below.

serial_echo_1 sketch on Serial Port 1 (TX1 and RX1)

void setup() {
  Serial1.begin(9600);               // Initialize serial port 1
}

void loop() {
  if (Serial1.available()) {         // Check if character received
    char rx_char = Serial1.read();   // Read the character
    Serial1.print("Received: ");     // Transmit a string
    Serial1.println(rx_char);        // Transmit the received character
  }
}

7.4.2 Testing for PWM Waveforms, Page 192

Use the sketch to generate PWM (Pulse Width Modulation) waveforms on each of the 15 PWM pins of the Arduino MEGA 2560.

void setup() {
  analogWrite(2, 26);   // PWM 10% 490Hz
  analogWrite(3, 38);   // PWM 15% 490Hz
  analogWrite(4, 51);   // PWM 20% 980Hz
  analogWrite(5, 64);   // PWM 25% 490Hz
  analogWrite(6, 77);   // PWM 30% 490Hz
  analogWrite(7, 89);   // PWM 35% 490Hz
  analogWrite(8, 102);  // PWM 40% 490Hz
  analogWrite(9, 115);  // PWM 45% 490Hz
  analogWrite(10, 128); // PWM 50% 490Hz
  analogWrite(11, 140); // PWM 55% 490Hz
  analogWrite(12, 153); // PWM 60% 490Hz
  analogWrite(13, 166); // PWM 65% 980Hz
  analogWrite(44, 179); // PWM 70% 490Hz
  analogWrite(45, 191); // PWM 75% 490Hz
  analogWrite(46, 204); // PWM 80% 490Hz
}

void loop() {
}

7.4.3 Testing UART Outputs, Page 194

Send a square wave out of each hardware serial port or UART on the Arduino MEGA 2560.

void setup() {
  Serial.begin(9600);
  Serial1.begin(9600);
  Serial2.begin(9600);
  Serial3.begin(9600);
}

void loop() {
  Serial.print('U');    // Pin 1, TX0
  Serial1.print('U');   // Pin 18, TX1
  Serial2.print('U');   // Pin 16, TX2
  Serial3.print('U');   // Pin 14, TX3
}

7.4.4 TWI Signals, Page 196

The simple sketch below can be used to test the TWI bus signals without the need to attach a TWI device to this bus.

#include <Wire.h>

void setup() {
  Wire.begin();
  Wire.beginTransmission((0xA0 >> 1));
  Wire.write(0x00);
  Wire.endTransmission();
}

void loop() {
}

7.4.5 SPI Signals, Page 198

The sketch simply sends a character out on the MOSI pin continually (Arduino MEGA 2560 digital pin 51).

#include <SPI.h>

void setup() {
  SPI.begin();
  SPI.beginTransaction(SPISettings(10000, MSBFIRST, SPI_MODE1));
}

void loop() {
  SPI.transfer('U');
  delay(1);
}

Ultimate Arduino MEGA 2560 Hardware Manual Errata

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