Arduino Mega 2560 pinout

When you buy an Arduino Mega, the question of pinout will surely arise in the course of your electronics project.

Inputs and outputs of the Arduino Mega

Each of the 54 digital pins on the Arduino 2560 Mega can be used as an input or output, using the pinMode (), digitalWrite () and digitalRead () functions. They work with 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pullup resistor (disconnected by default) of 20-50 kOhms.

In addition, some pins have special functions:

• Serial: 0 (RX) and 1 (TX);
• Serial 1: 19 (RX) and 18 (TX);
• Serial 2: 17 (RX) and 16 (TX);
• Serial 3: 15 (RX) and 14 (TX).

Used to receive (RX) and transmit (TX) TTL serial data. Pins 0 and 1 are also connected to the corresponding pins of the ATmega16U2 serial USB-to-TTL chip.

External interrupts:

2 (interrupt 0), 3 (interrupt 1), 18 (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21 (interrupt 2). These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. For more information refer to the function attachInterrupt ()

PW

2 to 13 and 44 to 46. Provide 8-bit PWM output with the analogWrite () function.

SPI:

50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS). These pins support SPI communication using the SPI library. The SPI pins are also broken out in the ICSP header, which is physically compatible with Uno, Duemilanove, and Diecimila.

LED:

13. there is a built-in LED connected to digital pin 13. When the pin is HIGH the LED is on, when the pin is LOW it is off.

TWI:

20 (SDA) and 21 (SCL). Support for TWI communication using the wire library. Note that these pins are not in the same location as the TWI pins on the Duemilanove or Diecimila.

The Mega2560 has 16 analog inputs, each of which provides 10 bits of resolution (i.e. 1024 different values). By default, they measure ground to 5 volts. However, it is possible to change the upper end of their range using the AREF pin and the analogReference () function.

There are a few other pins on the board:

AREF:

Reference voltage for the analog inputs. Used with analogReference ().

Reset:

Bring this line to LOW to reset the microcontroller. Usually used to add a reset button for shields that block the one on the board.

Arduino Mega 2560 PIN Diagram

Arduino Mega Pin Mapping Table