LED with Arduino Nano

Wiring for the LED with 220 Ω resistor on the Arduino Nano (ATmega328P, 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 Nano pin	Notes
A	Input to the part	D2 (PD2)	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 Nano 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(2, OUTPUT);  // A on D2
}

void loop() {
  digitalWrite(2, HIGH);
  delay(500);
  digitalWrite(2, LOW);
  delay(500);
}

Arduino board: arduino:avr:nano. Clones with the old bootloader upload at 57600 baud: choose “ATmega328P (Old Bootloader)” if uploads fail.

Questions

Which Arduino Nano pins do I use for the LED?

A → D2 (PD2), K → GND.

Does the LED work with the Arduino Nano at 5 V?

The LED is a 3.3 V part and the Arduino Nano 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 Nano pinout · LED with 220 Ω resistor: all pins and data

The LED on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the Arduino Nano

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