Running multiple LEDs with Arduino

Connecting Three LEDs with Arduino

Circuit Diagram

See Also: Arduino Development Platform

Video

Arduino Sketch

const int led1 = 2;

const int led2 = 3;

const int led3 = 4;

const int INTERVAL = 200; // 200 milli seconds interval

void setup() {

  pinMode(led1, OUTPUT);

  pinMode(led2, OUTPUT);

  pinMode(led3, OUTPUT);

}

void loop() {

  // Switch-off all LEDs

  digitalWrite(led1, LOW);

  digitalWrite(led2, LOW);

  digitalWrite(led3, LOW);

  delay(INTERVAL);

  // Switch on LED1 for 200 milli seconds 

  digitalWrite(led1, HIGH);

  delay(INTERVAL);

  digitalWrite(led1, HIGH);

  delay(INTERVAL);

  

  // Switch on LED2 for 200 milli seconds 

  digitalWrite(led2, HIGH);

  delay(INTERVAL);

  digitalWrite(led2, HIGH);

  delay(INTERVAL);

  // Switch on LED3 for 200 milli seconds 

  digitalWrite(led3, HIGH);

  delay(INTERVAL);

  digitalWrite(led3, HIGH);

  delay(INTERVAL);  

}

See Also: Arduino Development Platform