Arduino MEGA 2560 Hardware Manual Web Links
23 November 2020
On this page are web links from the 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 links directly below 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
188.8.131.52 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
The Arduino IDE is free to download from www.arduino.cc/en/Main/Software
184.108.40.206 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).
220.127.116.11 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 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.
18.104.22.168 MAC OS X
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.
22.214.171.124 Getting Started Guides
Links to getting started guides for any Arduino board can be found at:
Arduino MEGA 2560 specific getting started guide:
126.96.36.199 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.
188.8.131.52 Building Breadboard Circuits
A tutorial series at startingelectronics.org/beginners/start-electronics-now/ shows how to build breadboard circuits with some Arduino examples.
184.108.40.206 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
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
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.
Find the Wiring project at wiring.org.co on the web.
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/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
220.127.116.11 EEPROM Programming
www.arduino.cc/en/Reference/EEPROM is the library reference for using the EEPROM in sketches.
18.104.22.168 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.
22.214.171.124 SPI Devices
See the library reference www.arduino.cc/en/Reference/SPI for more information on the SPI library.
126.96.36.199 TWI and I²C Devices
See the library reference www.arduino.cc/en/Reference/Wire for more information on the Wire library.
188.8.131.52 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 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, Atmel Studio and C programming of Arduino boards using Atmel Studio. Also see chapter 5. Links to older Atmel/Microchip programmers that are now redundant are also listed for interest.
Atmel Studio – www.microchip.com/mplab/avr-support/atmel-studio-7
C Programming – wspublishing.net/avr-c/
Redundant no longer for sale programmers:
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
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.
184.108.40.206 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.
220.127.116.11 Pins as Inputs
Find the tutorial page at www.arduino.cc/en/Tutorial/DigitalReadSerial on the Arduino website.
3.3.2 PWM Pins
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.
18.104.22.168 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.
22.214.171.124 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.
126.96.36.199 Accessing SD Cards in Software
Go to www.arduino.cc/en/Reference/SD to find the SD card reference on the Arduino website.
188.8.131.52 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.
184.108.40.206 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
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 Atmel Studio
Find more information about the Atmel-ICE on the Microchip website at: www.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.
Update: Find older versions of Atmel Studio here: www.microchip.com/mplab/avr-support/avr-and-sam-downloads-archive
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 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 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.
9.5.2 Ethernet Shield Example
Information on this shield can be found at: store.arduino.cc/arduino-ethernet-shield-2