LED

Pinout — LED

Wiring notes

2-pin component. Use componentId led with the color in the label (e.g. Red LED). Pins: ANODE (+, long leg), CATHODE (-, short leg). Polarized — ANODE must connect to the positive side. Always use a current-limiting resistor (220Ω for 5V, 100Ω for 3.3V).

Example wiring diagram — LED

Example Arduino code — LED

This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.

// Canonical LED example for Arduino Uno
// Blinks a red LED through a 220Ω resistor on digital pin 4.

const int ledPin = 4;

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH);  // LED on
  delay(500);

  digitalWrite(ledPin, LOW);   // LED off
  delay(500);
}

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