Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (2023)

The Arduino Mega 2560 is an open source development board developed by the Arduino company. It is based on the Atmel ATmega2560P Microchip. The Atmega2560P is an 8-bit microcontroller that comes with a built-in bootloader, making it very convenient to flash the board with our code.

Like all Arduino boards, we can program the software running on the board using a language derived from C and C++. The simplest development environment is the Arduino IDE.

Atmega 2560P based Arduino Mega pinouts and specifications are detailed in this post.

Table of contents

  1. Arduino Mega pinout (detailed board layout)
    • How is the Arduino Mega 2560 powered?
    • I2C pins on Arduino Mega?
    • SPI pins on Arduino Mega?
    • Which pins are UART?
    • What is ICSP header?
    • How many analog pins on Arduino Mega?
    • How many digital pins are on Arduino Mega?
    • Which pins are PWM?
  2. Other pens
  3. specifications
  4. Arduino Mega schematic (official):
  5. Where to buy Arduino Mega

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(Video) Introduction to Arduino Mega 2560 | Pinout | Features | Proteus Simulation

Arduino Mega pinout (detailed board layout)

Arduino Mega 2560 has 54 digital I/O pins, with 16 pins being analog inputs, 14 pins being PWM, and 6 being serial hardware ports (UARTs).. It features a 16MHz crystal oscillator, power jack, ICSP header, USB-B connector and RESET button.

Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (1)

voltage regulator-The voltage regulator converts the input voltage to 5V. The main use of a voltage regulator is to control the voltage level in the Arduino board. Even if the input voltage of the regulator changes, the output voltage is constant and stable.

ATMega2560P:It is an AVR-RISC (Reduced Instruction Set Computer) based 8-bit microcontroller that executes powerful instructions in a single clock cycle. This allows it to effectively strike a balance between power consumption and processing speed.

crystal oscillatorThe quartz oscillator has a frequency of 16 MHz, which supplies the clock signal to the microcontroller. It provides the board with basic timing and control.

Reset-Knopf-It is used to reset the board, it is recommended to press it every time we flash a code on the board.

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How is the Arduino Mega 2560 powered?

There are three ways to power the Arduino Mega Board:

Tonneau lifter– Barrel jack or 7-12V DC power jack can be used to power our Arduino board. The hollow socket is usually connected to an adapter. The board can run on 5-20 volts with an adapter, but the manufacturer recommends keeping it between 7-12 volts.

Note:Above 12 volts the board may overheat and below 7 volts may not be enough to power the board.

note:Above 12 volts the board may overheat and below 7 volts may not be enough to power the board.

USB B-Port-The USB interface is used to plug in the USB cable. This connector can be used to power the device from the 5V supply and allows us to connect the board to the computer. The program is serially uploaded from the computer to the board via theUSB-Kabel.

vinIt is the modulated DC supply voltage that is used to regulate the ICs used in the link. It is also referred to as the primary voltage for ICs present on the Arduino board. The Vcc voltage value can be negative or positive with respect to the GND pin.

I2C-Pinson Arduino Mega?

It is the two-wire serial communication protocol. It stands for Inter-Integrated Circuits. The I2C uses two lines to send and receive data: a serial clock (SCL) pin and a serial data (SDA) pin (SDA).

  • SCL-It isserial clock. It is defined as the line that carries clock data. It is used to synchronize the movement of data between the two devices. The serial clock is generated by the master device.
  • SDA-It isserial data. It is defined as the line used by slave and master to send and receive data. Therefore it is called adata line,while SCL is called the clock line.

SPI-Pinson Arduino Mega?

It isSerial peripheral interface. Die PINs50, 51, 52 and 53are used as SPI pins. They are used by the microcontrollers to quickly communicate with one or more peripheral devices. There are three common lines to all peripherals:

  • SCK-It isserial clock. These are the clock pulses used to synchronize data transfer.
  • MISO-It isMaster input/slave output. The data is sent to the master via this data line in the MISO pin.
  • MOSI-It isMaster Out/Slave In. This line is used to send data to the peripheral devices.

And a common line:

  • SS-It isSlave selection. This line is used by the master. It acts as a release line. When a device's Slave Select pin value is LOW, it can communicate with the master. If it is HIGH, it ignores the master. This allows us to have multiple SPI peripherals sharing the same MISO, MOSI, and CLK lines

What pens areUART?

UART stands forUniversal asynchronous receiverandSender. It allows the Arduino to communicate with serial devices. There are 4 UART in Arduino Mega:

(Video) Arduino Mega 2560 Demo Overview

  • Pin 0 - RXD0, Pin 1 - TXD0
  • Pin 19 - RXD1, Pin 18 - TXD1
  • Pin 17 - RXD2, Pin 16 - TXD2
  • Pin 15 - RXD3, Pin 14 - TXD3

This pin is used for serial UART communication with PCs or other serial devices for the purpose of data sharing and logging. It is used with the serial.Begin() function to set the baud rate setting and start communication with the serial.Println() function to print an array of characters on another device output.

External Interruptions –The external interrupts can be formed by using 6 pins like Interrupt 0(0), Interrupt 1(3), Interrupt 2(21), Interrupt 3(20), Interrupt 4(19), Interrupt 5(18). These pins can be used to trigger an interrupt on a low value, a rising edge, falling edge, or a change in value.

what isICSPHeader?

Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (2)

It isSerial in-circuit programming. We can use these pins to program the Arduino board's firmware. The firmware changes with the new functionalities are sent to the microcontroller using the ICSP header.

The ICSP header consists of 6 pins.

How many analog pins on Arduino Mega?

The Arduino Mega consists of 16 analog pins that use ADC (Analog to Digital Converter).. These pins can serve as analog inputs, but can also function as digital inputs or digital outputs.

These pins accept inputs in the form of analog signals and return values ​​that range from 0 to 1023 (this is because the Arduino Mega uses a 10-bit analog-to-digital converter, or 2nd10Resolution).

An analog-to-digital converter works in three stages: sampling, quantization and digitization. Since the Arduino operates in a 0-5 volt range, the device's step size is 5/1023 = 0.00488Voltor 4.88mV.

Thus we can interpret an input of 4.88mV as 1, 9.77mV as 2 and so on until 5V = 1023. Anything below 4.88mV is considered 0 and above 4.99V as 1023.

Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (3)

How many digital pins are on Arduino Mega?

Arduino Mega 2560 has 54 digital I/O pins. All pins between 0 and 53 are digital input/output pins.

The Arduino digital pins can only read two states: when a voltage signal is present and when there is no signal. This type of input is usually referred to as digital (or binary), and these states are referred to as HIGH and LOW or 1 and 0.

LED (13):There is a built in LED in the board which is connected to digital pin 13. When this pin is HIGH or 1 the LED is on, when the pin is LOW or 0 it is off.

Which pins are PWM?

There are 15 pins from the set of digital pins that are PWM (Pulse Width Modulation) pins. Starting from digital pin 2 to digital pin 13 and pin 44, 45 and 46 are PWM pins.

Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (4)
(Video) Back To Basics: Arduino Mega 2560 Pin Usage with SimVimX/Real Sim Control

Each of these digital pins can generate a pulse width modulation signal of 23-Bit resolution. We can generate the PWM signal using the analogWrite() function.

Other pens

Masse (ground pins): There are 7 ground pins available on the board.

RESET TO DEFAULT- resets the Arduino board.

E/A-Referenzspannung (IOREF)- This pin is the input/output reference. It provides the voltage reference at which the microcontroller is currently operating. Sending a signal to this pin does nothing.

AREF:AREF meansAanalogReference. It is the reference voltage against all othersanalog voltages(analoginputs) are measured.

3,3 Vand5V:These pins provide a regulated 5V and 3.3V, respectively, to the external components connected to the board.


Below are the technical specifications of the Arduino Mega 2560:

operating voltage5 V
power supply7V – 12V
Current consumption50mA - 200mA
Power consumption deep sleep500 µA
Digitale I/O-Pins54
Digitale I/O-Pins mit PWMfifteen
Analog input pins16
DC current per I/O pin40mA
DC power for 3.3V pin50mA
Flash memory256 KB
EEPROM4096 Byte
clock frequency16 MHz
power connectionYes indeed
USB connectionYes indeed

Arduino Mega schematic (official):

Download Arduino Mega Schematic,Click here.

Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (5)
Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (6)

**Those:Official Arduino Mega Store

Where to buy Arduino Mega

You can get the original Arduino Mega Board from various stores. However, if you would like to purchase it from Amazon, we recommend the following providers:

Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (7)

Original Arduino Mega

(Video) Electronics - The ELEGOO MEGA2560 R3 Most Complete Starter Kit.

Preis: $34,00

Ultimate Guide to Arduino Mega 2560 Pinouts, Specifications and Schematic (8)

Arduino Mega-Clone

Preis: 20,99 $

Read related articles:

|Arduino UNO pinouts and specifications in detail

|Pinouts and specifications of the Arduino Nano in detail

|Pinouts and specifications of the Arduino Pro Mini in detail

(Video) Ultimate Arduino Mega 2560 Hardware Manual Review


1. | Simple Introduction to the Arduino | Arduino Mega 2560 Hardware Overview by kaushik classes
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2. Ultimate Arduino MEGA2560 Starter Kit from Elegoo Part 1
3. Arduino MEGA 2560 - Bitesize Review - A000067
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4. Introduction to Arduino Mega 2560(All Components & Pin Configuration)-Robotics For Beginners(Bangla)
(Tamanna Nazmin )
5. Arduino Uno - Pins Overview
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6. Arduino mega 2560 introduction and overview in tamil


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