Javatpoint Logo
Javatpoint Logo

Arduino Mega Pinout

The Arduino Mega is based on ATmega2560 Microcontroller. The advantage of using the Arduino Mega board over other boards is that it gives the advantage of working with more memory space.

The Pinout of Arduino Mega is shown below:

Arduino Mega Pinout

The description of pins present on the Arduino board are listed below:

  • ATmega2560 Microcontroller - The Atmega2560 is a CMOS (Complementary Metal Oxide Semiconductor) low powered 8-bit microcontroller. The Mega 2560 is based on AVR RISC Architecture. Here, AVR stands for Audio Video Recorder and RISC stands for Reduced Instruction Set Computing.

It is used for the boards that require more memory, sketch, and I/O lines. It is recommended for complex projects, such as Robotics, etc.

  • GND - Ground Pins. The ground pins are used to ground the circuit.
  • USB Port

It allows the board to connect to the computer. It is essential for the programming of the Arduino Mega board.

We usually plug the USB cable in the USB port to load the sketch to the board.

  • UART-

It stands for Universal Asynchronous Receiver and Transmitter. It permits the Arduino to communicate with serial devices.

  • Power Jack

The power jack is used to supply the power to the board. The adapter is plugged-in to the power jack of the Arduino Mega board.

  • ICSP Header

The program or firmware with the advanced functionalities is received by microcontroller with the help of the ICSP (In-Circuit Serial Programming) header.

The ICSP header consists of 6 pins.

The structure of the ICSP header is shown below:

Arduino Mega Pinout

It is the top view of the ICSP header.

  • I2C

It is the two-wire serial communication protocol. It stands for Inter-Integrated Circuits. The I2C is a serial communication protocol that uses SCL (Serial Clock) and SDA (Serial Data) to receive and send data between two devices. The SCL is a clock line, while SDA is a data line.

  • Analog pins

There are total of 16 Analog pins from A0 - A15. The function of Analog pins is to read the analog sensor used in the connection. It can also act as GPIO (General Purpose Input Output) pins.

  • Digital Pins

There are 54 digital Input/Output pins from pin numbered from 0 to 53. The 15 pins from the digital I/O are PWM (Pulse Width Modulation) pins numbered from D2 - D13 and D44 - D46. The digital pins have the value either HIGH or LOW.


It stands for Serial Peripheral Interface. It is popularly used by the microcontrollers to communicate with one or more peripheral devices quickly. The SCK stands for serial clock. In slave, it works as the input of the clock generator. In master, it works as the output clock.

SPI can even have various devices on the bus.

  • MISO

It stands for Master In/ Slave Output. The slave line in MISO is used to send data to the master.

  • MOSI

It stands for Master Output/ Slave Input. The MOSI line Arduino carries the data from Arduino to the control devices of SPI. The slave line in MOSI is used to send data to its peripherals.


It stands for Slave Select. It is the Slave Select line, which is used by the master. It acts as the enable line.

The MISO, MOSI, and SS support SPI communication.

The multiple SPI devices in Arduino are able to share the same SS, MOSI, and MISO lines.


It stands for Input Output voltage REFerence. It allows the shields to check the operating voltage (3.3V or 5V) of the board. The shields are connected to the Arduino Board.

The Microcontroller operates with the reference voltage provided by the IOREF.

  • 5V: The 5V pin works as the output regulated voltage of 5V.
  • 3V3: The 3V3 pin works as the output regulated voltage of 3.3V.
  • RX and TX: The successful flow of data is represented by the lighting of the TX and RX LED.
  • Vin: It is defined as the input voltage, which is applied to the Arduino Board when it is using an external power source.

Youtube For Videos Join Our Youtube Channel: Join Now


Help Others, Please Share

facebook twitter pinterest

Learn Latest Tutorials


Trending Technologies

B.Tech / MCA