const int buzzerPin = 11; // Digital pin connected to buzzer
const int ledPins[] = {2, 4, 9,13}; // Digital pins connected to LEDs
const int numLeds = 4; // Number of LEDs

void setup() {
  pinMode(buzzerPin, OUTPUT); // Set buzzer pin as an output
  for (int i = 0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT); // Set each LED pin as an output
  }
}

void loop() {
  tone(buzzerPin,500); //  buzzer ring
  delay(500); // Buzzer on for 500ms

  // Dancing lights effect
  for (int i = 0; i < numLeds; i++) {
    digitalWrite(ledPins[i], HIGH); // Turn on the LED
    delay(100); // Wait for 100ms
    digitalWrite(ledPins[i], LOW); // Turn off the LED
  }
  
  noTone(buzzerPin); // Turn off the buzzer
  delay(500); // Buzzer off for 500ms
}