LED with Arduino Mega 2560 R3

Wiring for the LED with 220 Ω resistor on the Arduino Mega 2560 R3 (ATmega2560, 5 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

LED pin	Role	Arduino Mega 2560 R3 pin	Notes
A	Input to the part	22 (PA0)	Anode (long leg), through the resistor to a GPIO
K	Ground	GND	Cathode (short leg, flat side)

Check before you power it on

The LED is a 3.3 V part and the Arduino Mega 2560 R3 uses 5 V signals. Power it from 3.3 V and put a level shifter on the signal wires, or buy a 5 V version of the module.

Test code (Arduino)

void setup() {
  pinMode(22, OUTPUT);  // A on 22
}

void loop() {
  digitalWrite(22, HIGH);
  delay(500);
  digitalWrite(22, LOW);
  delay(500);
}

Arduino board: arduino:avr:mega.

Questions

Which Arduino Mega 2560 R3 pins do I use for the LED?

A → 22 (PA0), K → GND.

Does the LED work with the Arduino Mega 2560 R3 at 5 V?

The LED is a 3.3 V part and the Arduino Mega 2560 R3 uses 5 V signals. Power it from 3.3 V and put a level shifter on the signal wires, or buy a 5 V version of the module.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Arduino Mega 2560 R3 pinout · LED with 220 Ω resistor: all pins and data

The LED on other boards

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