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Arduino Mega 2560 Rev3
The Arduino Mega 2560 Rev3 is a microcontroller board based on the ATmega2560, offering significantly more I/O than standard Arduino boards. With 54 digital ...
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The Arduino Mega 2560 Rev3 is a microcontroller board based on the ATmega2560, offering significantly more I/O than standard Arduino boards. With 54 digital I/O pins, 16 analog inputs, and 4 hardware serial ports, it's the go-to board for complex projects that demand extensive connectivity.
The Rev3 update introduces the ATmega16U2 USB-to-serial converter (replacing the 8U2), the 1.0 pinout with dedicated SDA/SCL pins and IOREF for improved shield compatibility, and a stronger reset circuit. Compatible with most shields designed for the Arduino Uno, Duemilanove, and Diecimila.
Key Features
- 54 Digital I/O Pins – 14 usable as PWM outputs
- 16 Analog Inputs – For extensive sensor arrays
- 4 Hardware UARTs – Multiple serial connections for GPS, Bluetooth, and other modules
- 256KB Flash Memory – Room for large, complex sketches (8KB used by bootloader)
- Rev3 Pinout – SDA/SCL and IOREF pins, ATmega16U2 USB-to-serial converter
- Broad Shield Compatibility – Works with most existing Arduino shields
Specifications
- Microcontroller – ATmega2560
- Operating Voltage – 5V
- Input Voltage – 7–12V recommended (6–20V limits)
- Digital I/O Pins – 54 (14 PWM)
- Analog Input Pins – 16
- Hardware Serial Ports – 4 UARTs
- DC Current per I/O Pin – 40mA
- DC Current for 3.3V Pin – 50mA
- Flash Memory – 256KB (8KB used by bootloader)
- SRAM – 8KB
- EEPROM – 4KB
- Clock Speed – 16MHz
Ideal For
- Projects requiring many I/O pins (LED arrays, multi-sensor setups)
- Robotics with multiple motors and sensors
- 3D printer controller boards
- Data logging with multiple serial devices
Package Contents
- 1× Arduino Mega 2560 Rev3
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- Bootloader
- Small starter software on a microcontroller that lets new code be uploaded before the main program runs. Knowing how to enter bootloader mode matters when you need to program the board or recover it after a faulty sketch.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- EEPROM
- A type of non-volatile memory that keeps stored data even when power is turned off. In a sensor module, it can be used to store settings or calibration data so they do not need to be re-entered every time.
- Flash memory
- Flash memory is non-volatile memory that retains stored data even when power is removed, and can be erased and rewritten in blocks. It lets data such as firmware, settings or saved records persist across power cycles.
- GPS
- The US satellite navigation system used by GNSS receivers to calculate position and time. Support for GPS is important because it is widely available and often used together with other constellations for more reliable positioning.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- SDA/SCL
- SDA and SCL are the two signal lines used by an I2C bus: data and clock. Seeing these names helps you identify the correct connections when wiring I2C devices, even though Qwiic cables usually hide that wiring for you.
- Shield
- An add-on board that plugs into a main controller board to give it extra features such as sensing, motor control or communication. Knowing a product supports shields helps you judge whether it can connect neatly into an existing maker-board setup.
- SRAM
- Fast temporary memory used by a processor while a program is running. More SRAM helps with projects that handle larger data buffers, networking, displays, or more complex code.
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Brands
ATmega2560 Datasheet
Datasheet · 7.1 MB · Click any page to view full size
Arduino Mega 2560 Rev3 Schematic
Schematic · 46.4 KB · Click any page to view full size
Supplier page — dfrobot.com
Supplier Description · 753.9 KB · Click any page to view full size
Related Tutorials
Free guides on learn.littlebird.com.au
