Arduino Mega 2560 Rev3: Block Diagram, Features and Applications
ARDUINO MEGA2560 ATMEGA2560
The Arduino Mega 2560 is an excellent development board, specifically designed to build more extensive applications compared to other Arduino development boards.

Arduino Mega 2560 Rev3 Clone | Review,LED Blink Test & Reset
- Arduino Mega 2560 Rev3 overview
- Specifications
- Arduino Mega 2560 Rev3 block diagram
- Arduino Mega 2560 Rev3 features
- Arduino Mega 2560 Rev3 related boards
- Arduino Mega 2560 Rev3 vs. Arduino Uno Rev 3
- Arduino Mega 2560 Rev3 applications
- Arduino Mega 2560 Rev3 Project
- Arduino Mega 2560 Rev3 documentation
- Datasheet PDF
Arduino Mega 2560 Rev3 overview

The Arduino Mega 2560 is an excellent development board, specifically designed to build more extensive applications compared to other Arduino development boards. This board, based on the ATmega2560 microcontroller, operates at a frequency of 16 MHz, offering greater flexibility than other boards. It is equipped with 54 digital input/output pins (15 of which can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a USB connection, a power jack, an ICSP interface, and a reset button.
Key specifications of the ATmega2560 microcontroller:
| Specification | Detail |
|---|---|
| Architecture | 8-bit AVR RISC |
| Flash Memory | 256KB |
| SRAM | 8KB |
| EEPROM | 4KB |
| Clock Frequency | Up to 16MHz |
| GPIO Pins | 86 programmable |
| Timers/Counters | Two 8-bit timer/counters, four 16-bit timer/counters |
| ADCs | 16-channel 10-bit |
| USARTs | Four |
| SPI Interface | Yes |
| On-chip Analog Comparator | Yes |
Please note that the ATmega2560 uses 5V logic levels, so it might not be compatible with 3.3V sensors and other peripherals. This can be overcome using level-shifting circuits.
Simply connect it to a computer via a USB cable, or power it with an AC-to-DC adapter or battery to start using it. The Mega 2560 board is compatible with most shields designed for the Uno and previous boards like Duemilanove or Diecimila. Additionally, the Mega 2560 is an update to the Arduino Mega and has replaced it.

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Specifications
- TypeParameter
- Factory Lead Time3 Weeks
- Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Fixed - Weight49.895161g
- Series
In electronic components, the "Series" refers to a group of products that share similar characteristics, designs, or functionalities, often produced by the same manufacturer. These components within a series typically have common specifications but may vary in terms of voltage, power, or packaging to meet different application needs. The series name helps identify and differentiate between various product lines within a manufacturer's catalog.
AVR® ATmega - Published2010
- Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Active - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - TypeMCU 8-Bit
- Interface
In electronic components, the term "Interface" refers to the point at which two different systems, devices, or components connect and interact with each other. It can involve physical connections such as ports, connectors, or cables, as well as communication protocols and standards that facilitate the exchange of data or signals between the connected entities. The interface serves as a bridge that enables seamless communication and interoperability between different parts of a system or between different systems altogether. Designing a reliable and efficient interface is crucial in ensuring proper functionality and performance of electronic components and systems.
UART, USB - Number of Bits8
- Core Processor
The term "Core Processor" typically refers to the central processing unit (CPU) of a computer or electronic device. It is the primary component responsible for executing instructions, performing calculations, and managing data within the system. The core processor is often considered the brain of the device, as it controls the overall operation and functionality. It is crucial for determining the speed and performance capabilities of the device, as well as its ability to handle various tasks and applications efficiently. In modern devices, core processors can have multiple cores, allowing for parallel processing and improved multitasking capabilities.
AVR - Min Input Voltage
The parameter "Min Input Voltage" in electronic components refers to the minimum voltage level that must be applied to the component for it to operate within its specified parameters. This value is crucial as providing a voltage below this minimum threshold may result in the component malfunctioning or not functioning at all. It is important to adhere to the specified minimum input voltage to ensure the proper operation and longevity of the electronic component. Failure to meet this requirement may lead to potential damage to the component or the overall system in which it is used.
7V - Max Input Voltage
Max Input Voltage refers to the maximum voltage level that an electronic component can safely handle without getting damaged. This parameter is crucial for ensuring the proper functioning and longevity of the component. Exceeding the specified maximum input voltage can lead to overheating, electrical breakdown, or permanent damage to the component. It is important to carefully adhere to the manufacturer's guidelines regarding the maximum input voltage to prevent any potential issues and maintain the reliability of the electronic device.
12V - Utilized IC / Part
Utilized IC / Part is a parameter that refers to the extent to which an integrated circuit (IC) or electronic component is being used or consumed within a system or application. It typically indicates the percentage or ratio of the component's capabilities that are being utilized in a given scenario. This parameter is important for assessing the efficiency and performance of the component, as well as for determining if the component is being underutilized or overburdened in a particular application. Monitoring and optimizing the utilization of ICs and electronic parts can help improve overall system reliability, efficiency, and cost-effectiveness.
ATmega2560 - Density
In electronic components, "Density" refers to the mass or weight of a material per unit volume. It is a physical property that indicates how tightly packed the atoms or molecules are within the material. The density of a component can affect its performance and characteristics, such as its strength, thermal conductivity, and electrical properties. Understanding the density of electronic components is important for designing and manufacturing processes to ensure optimal performance and reliability.
2 Mb - Evaluation Kit
An Evaluation Kit is a collection of hardware and software components designed to help engineers and developers assess and test the functionality of a particular electronic component or system. It typically includes a development board, sample code, utilities, and documentation to facilitate development and prototype testing. Evaluation Kits enable users to quickly prototype applications, evaluate performance characteristics, and determine compatibility with other systems. They are commonly used in the design and development phases of electronic projects to simplify the integration of complex components.
Yes - ContentsBoard(s)
- Board Type
Board Type refers to the specific configuration or category of a printed circuit board (PCB) used in electronic devices. It defines the characteristics and design of the board, such as single-sided, double-sided, or multilayer constructions. The Board Type impacts factors like signal integrity, power distribution, and thermal management, influencing the overall performance and functionality of the electronic component. Different applications and environments may require specific Board Types to meet durability and operational requirements.
Evaluation Platform - Platform
In the context of electronic components, the parameter "Platform" typically refers to the specific hardware or software environment on which the component is designed to operate. This could include the type of operating system, processor architecture, communication protocols, or other technical specifications that the component is compatible with. Understanding the platform requirements of electronic components is crucial for ensuring proper functionality and integration within a larger system. Manufacturers often provide detailed information about the supported platforms to help users select the right components for their applications.
Arduino Mega2560 - Height6.35mm
- Length177.8mm
- Width101.6mm
- REACH SVHC
The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.
Unknown - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
RoHS Compliant
Arduino Mega 2560 Rev3 block diagram

Arduino Mega 2560 Rev3 features
•ATmega2560 Processor
-Up to 16 MIPS Throughput at 16MHz
-256k bytes (of which 8k is used for the bootloader)
-4k bytes EEPROM
-8k bytes Internal SRAM
-32 × 8 General Purpose Working Registers
-Real Time Counter with Separate Oscillator
-Four 8-bit PWM Channels
-Four Programmable Serial USART
-Controller/Peripheral SPI Serial Interface
•ATmega16U2
-Up to 16 MIPS Throughput at 16 MHz
-16k bytes ISP Flash Memory
-512 bytes EEPROM
-512 bytes SRAM
-USART with SPI master only mode and hardware flow control (RTS/CTS)
-Master/Slave SPI Serial Interface
•Sleep Modes
-Idle
-ADC Noise Reduction
-Power-save
-Power-down
-Standby
-Extended Standby
•Power
-USB Connection
-External AC/DC Adapter
•I/O
-54 Digital
-16 Analog
-15 PWM Output
Arduino Mega 2560 Rev3 related boards
Arduino Mega 2560 Rev3 vs. Arduino Uno Rev 3
| Specification | Arduino Mega 2560 Rev3 | Arduino Uno Rev 3 |
|---|---|---|
| Microcontroller | ATmega2560 | ATmega328P |
| Operating Voltage | 5V | 5V |
| Input Voltage (recommended) | 7-12V | 7-12V |
| Digital I/O Pins | 54 (15 provide PWM output) | 14 (6 provide PWM output) |
| Analog Input Pins | 16 | 6 |
| DC Current per I/O Pin | 20 mA | 20 mA |
| Flash Memory | 256kb | 32kb |
| SRAM | 8kb | 2kb |
| EEPROM | 4kb | 1kb |
| Clock Speed | 16 MHz | 16 MHz |
| Length x Width (mm) | 101.5 x 53.3 | 68.6 x 53.4 |
Please note that both boards have a USB connection, a power jack, an ICSP header, and a reset button. They also both support UART, I2C, and SPI communication protocols.
Arduino Mega 2560 Rev3 applications
Here are some of the key applications of the Arduino Mega 2560 Rev3 board:
Robotics: The Mega 2560 is commonly used in robotics projects due to its large number of I/O pins, high processing power, and ability to control multiple motors and sensors. Common robotics projects include robotic arms, self-balancing robots, autonomous rovers, etc.
3D Printing: The Mega 2560 can handle the complex algorithms required for 3D printing. Its memory and processing power allow slicing 3D models and controlling stepper motors with precision. The large number of I/O pins is useful for multiple extruder setups.
Home Automation: With the Mega 2560, many home automation projects can be implemented including smart thermostats, security systems, automated blinds, and more. The board provides enough I/O pins and processing power to control many sensors and actuators.
IoT/Wireless: The Mega 2560 can interface with WiFi/Bluetooth/GSM shields to enable wireless connectivity. This allows remote monitoring and control for IoT applications. Example projects include smart agriculture, fleet tracking, environment monitoring.
Advanced Hobby Projects: For hobbyists wanting to build advanced projects with many inputs/outputs, the Mega 2560 provides the required connectivity. Example projects are CNC machines, laser cutters, flight controllers, LED displays, etc.
Rapid Prototyping: The large number of I/O pins and processing power of the Mega 2560 allows quickly testing out more complex project ideas and prototyping circuits before building dedicated PCBs.
Arduino Mega 2560 Rev3 Project
Implementing a Security-Based Alarm System with Arduino Mega 2560
This alarm system can be deployed in various environments such as homes, schools, hospitals, industries, and colleges, to detect unauthorized movement.

Components:
Arduino Mega 2560: The microcontroller board based on the ATmega2560.
PIR Sensor: A motion sensor used to detect movement within a range of 5 to 12 meters.
GSM Module: A module that communicates over GSM cellular networks to send and receive messages.
Buzzer: An audio signaling device to alert when motion is detected.
LED: A light-emitting diode that indicates the status of the system.
The GSM (Global System for Mobile Communication) module is employed for sending and receiving messages in critical areas. It can also function as a GSM modem. The PIR sensor, with a high sensitivity and low noise, is capable of detecting human movement within a range of 5m to 12m.
Connections:
Connect the RX pin of the GSM board to pin 04 and the TX pin to pin 03 of the Arduino Mega 2560.
Connect a 5V power supply to the Arduino and a 12V DC to the GSM board.
For the PIR sensor, connect the first pin to a 5v DC voltage range and the second pin to pin 5 on the Arduino board.
Connect the anode (+) of the LED to pin 7 and the cathode (-) to GND on the Arduino board.
For the buzzer, connect the red wire to pin 10 and the black wire to GND on the Arduino board.
Arduino Code:
#include < SoftwareSerial.h >
#include "Timer.h"
const int PIR = 5;
const int TC35TXD0 = 04;
const int TC35RXD0 = 03;
SoftwareSerial mySerial = SoftwareSerial(TC35RXD0, TC35TXD0);
const int siren = 10;
int count;
Timer t;
void setup()
{
pinMode(PIR, INPUT);
pinMode(siren, OUTPUT);
mySerial.begin(9600);
digitalWrite(siren, LOW);
count = 0;
}
void loop()
{
if (digitalRead(PIR) == HIGH)
{
digitalWrite(siren, HIGH);
delay(500);
digitalWrite(siren, LOW);
delay(15000);
mySerial.print("AT+CMGF=1\r");
delay(1000);
mySerial.print("AT+CMGS=\"+xxxxxxxxxxxx\"\r");
delay(1000);
mySerial.println("Motion detected ALERT!");
mySerial.print("\r");
delay(1000);
mySerial.println((char) 26);
mySerial.println();
delay(5000);
digitalWrite(siren, HIGH);
delay(20000);
digitalWrite(siren, LOW);
delay(1800000);
}
}
The Arduino code provided sets up the necessary input and output pins and initializes the GSM module. It then continuously checks for any movement detected by the PIR sensor. If movement is detected, the LED lights up, the siren sounds, and an SMS alert is sent via the GSM module.
This security system can effectively monitor the presence of any object or person and alert the user through SMS and alarm. It operates under the GSM module, making it a reliable security solution for various settings.
Arduino Mega 2560 Rev3 documentation
EAGLE FILES IN .ZIP SCHEMATICS IN . PDF BOARD SIZE IN .DXF
| Type | Description | Link |
|---|---|---|
| Tutorial | Getting Started with Arduino MEGA2560 | Arduino Official Guide |
| Tutorial | Introduction to Arduino Mega 2560 Rev3 | The Engineering Projects |
| Tutorial | Video tutorial of Arduino Mega 2560 | Arduinoque |
| Tutorial | ELEGOO Mega 2560 The Most Complete Starter Kit Tutorial | ELEGOO Official |
| Project | The 15 Best Arduino Mega 2560 Projects of 2023 | All3DP |
| Project | Arduino Mega 2560 Rev3e in Eagle CAD | PCBWay |
| Resource | Mega 2560 Rev3 Arduino Documentation | Arduino Documentation |
| Resource | ARDUINO MEGA 2560 REV3 footprint & symbol | SnapEDA |
| Resource | Arduino Mega 2560 Pinout, Projects & Spec | devboards.info |
Datasheet PDF
- Datasheets :
- Design Resources :
1.What is the difference between the Mega 2560 and Arduino Uno?
The Mega 2560 has more digital I/O pins (54 vs 14), more analog inputs (16 vs 6), larger flash memory (256KB vs 32KB), and more SRAM (8KB vs 2KB) compared to the Uno.
2.Can the Mega 2560 be powered from a USB port?
Yes, the Mega 2560 can be powered via the USB connection or an external power supply. The recommended input voltage is 7-12V.
3.How much current can the I/O pins provide/sink?
The I/O pins can sink or source a maximum of 40mA per pin. The total for all I/O pins should not exceed 200mA.
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