Is the Arduino Mega 2560 compatible with standard Arduino Uno shields?

Yes, the Arduino Mega 2560 is designed to be highly compatible with most standard shields created for the Arduino Uno. The core pin layout matches the Uno's footprint, allowing you to plug in existing motor drivers, LCD screens, and Ethernet shields directly.

What is the main difference between the Mega 2560 and the Uno?

The main difference is the sheer amount of connection points and memory. The Mega 2560 offers 54 digital pins, 16 analog pins, 4 hardware UARTs, and 256 KB of flash memory, making it suitable for massive projects, whereas the Uno has 14 digital pins, 6 analog pins, 1 UART, and 32 KB of memory.

How should I power the Arduino Mega without a USB connection?

You can power the board using an external AC-to-DC power adapter plugged into the onboard 2.1mm center-positive power jack. We highly recommend using a power supply that provides between 7V and 12V to ensure the onboard voltage regulator operates efficiently without overheating.

What happens if I accidentally draw too much power from the USB port?

If you accidentally draw more than 500mA, the Mega 2560's built-in resettable polyfuse will automatically break the electrical connection. This safety feature protects your computer's USB port from damage, and the connection will restore itself once the short or overload is removed.

Can I get technical support for my STEM project at your Hong Kong store?

Yes, you can bring your project ideas to Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po for expert advice. Our technical staff can help you select the right sensors, motor drivers, and power supplies to maximize the potential of your Arduino Mega.

Arduino Mega 2560 Rev3 | 54-Pin Microcontroller Board

Name: Arduino Mega 2560 Rev3 | 54-Pin Microcontroller Board
Brand: Sun Cheong Computer Company Limited
SKU: 21CU000080
Price: 359.0 HKD
Availability: InStock

Short Product Description

The Arduino Mega 2560 Rev3 is a high-performance microcontroller board designed for complex DIY robotics, 3D printers, and advanced STEM projects. Powered by the robust ATmega2560 chip, it features a massive array of 54 digital I/O pins, 16 analog inputs, and 4 hardware serial ports to handle multiple sensors and actuators simultaneously. Available for instant pickup at Sun Cheong Computer Co. Ltd.(新昌電腦有限公司) in Sham Shui Po, our technical staff can provide expert advice on integrating this powerful board with your custom electronic builds and automation systems.

Key Features

ATmega2560 Microcontroller: Delivers robust processing power and 256 KB of flash memory for executing highly complex, multi-layered code.
54 Digital I/O Pins: Provides an expansive array of connection points, including 15 PWM outputs, to control dozens of LEDs, servos, and relays simultaneously.
4 Hardware UARTs: Features four dedicated hardware serial ports for seamless, lag-free communication with multiple external modules.
Resettable Polyfuse: Protects your computer's USB port by automatically tripping if the current draw exceeds 500mA during a short circuit.
Broad Shield Compatibility: Designed to be physically and electronically compatible with most standard shields created for the Arduino Uno.
Flexible Power Options: Can be powered safely via a standard USB cable or an external 7-12V DC power adapter (center-positive).

Full Product Description

Advanced Processing for Complex DIY Robotics

The Arduino Mega 2560 Rev3 provides the immense processing capacity and pin count required for highly complex electronic projects that outgrow standard microcontrollers. By utilizing the powerful ATmega2560 chip running at 16 MHz, this development board allows makers to construct intricate 3D printers, multi-axis robotic arms, and comprehensive smart home automation hubs. Its plug-and-play USB interface and preprogrammed bootloader ensure that you can start uploading code immediately via the Arduino IDE without needing external hardware programmers.

Massive I/O Array and Memory Capacity

This Mega 2560 Microcontroller Board eliminates the frustration of running out of connection points by offering 54 digital input/output pins (15 of which support PWM) and 16 analog inputs. It also features 256 KB of flash memory, providing ample storage space for exceptionally long and complex C++ code sketches. The inclusion of 4 hardware UARTs (serial ports) allows you to communicate with multiple serial devices—such as GPS modules, Bluetooth transceivers, and RFID readers—simultaneously without experiencing software serial lag.

Pro Tip from Our Technicians

When powering the Arduino Mega 2560 via the DC power jack, our Sham Shui Po technical team strongly advises using a reliable 7V to 12V AC-to-DC power adapter. Although the board's absolute input limit is 20V, supplying more than 12V will cause the onboard voltage regulator to overheat and potentially damage the microcontroller. Furthermore, you do not need to worry about accidental short circuits during prototyping; the board features a resettable polyfuse that automatically breaks the connection if more than 500mA is drawn from your computer's USB port.

Technical Specifications

Brand: Arduino
Model: Mega 2560 Rev3
Microcontroller: ATmega2560
Operating Voltage: 5V
Input Voltage (Recommended): 7-12V
Input Voltage (Limit): 6-20V
Digital I/O Pins: 54 (of which 15 provide PWM output)
Analog Input Pins: 16
Hardware Serial Ports (UARTs): 4
DC Current per I/O Pin: 20 mA
Flash Memory: 256 KB (8 KB used by bootloader)
SRAM: 8 KB
EEPROM: 4 KB
Clock Speed: 16 MHz
Dimensions: 101.52 mm x 53.3 mm
Weight: 37 g

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Is the Arduino Mega 2560 compatible with standard Arduino Uno shields?Yes, the Arduino Mega 2560 is designed to be highly compatible with most standard shields created for the Arduino Uno. The core pin layout matches the Uno's footprint, allowing you to plug in existing motor drivers, LCD screens, and Ethernet shields directly.
What is the main difference between the Mega 2560 and the Uno?The main difference is the sheer amount of connection points and memory. The Mega 2560 offers 54 digital pins, 16 analog pins, 4 hardware UARTs, and 256 KB of flash memory, making it suitable for massive projects, whereas the Uno has 14 digital pins, 6 analog pins, 1 UART, and 32 KB of memory.
How should I power the Arduino Mega without a USB connection?You can power the board using an external AC-to-DC power adapter plugged into the onboard 2.1mm center-positive power jack. We highly recommend using a power supply that provides between 7V and 12V to ensure the onboard voltage regulator operates efficiently without overheating.
What happens if I accidentally draw too much power from the USB port?If you accidentally draw more than 500mA, the Mega 2560's built-in resettable polyfuse will automatically break the electrical connection. This safety feature protects your computer's USB port from damage, and the connection will restore itself once the short or overload is removed.
Can I get technical support for my STEM project at your Hong Kong store?Yes, you can bring your project ideas to Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po for expert advice. Our technical staff can help you select the right sensors, motor drivers, and power supplies to maximize the potential of your Arduino Mega.

Target Users / Applications

3D Printer Builders: Utilizing the massive I/O count and memory to run complex Marlin firmware for custom-built RepRap 3D printers and CNC machines.
Advanced STEM Students: Designing multi-axis robotic arms or autonomous rovers that require simultaneous control of numerous servo motors and ultrasonic sensors.
Industrial Automation Prototypers: Creating central control hubs for smart agriculture systems that read data from dozens of soil, temperature, and light sensors concurrently.