int buzzPin = 7;

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

void loop() {
  playNote(440, 100);  
  delay(100);  

  playNote(440, 100);  
  delay(100);              
  
  playNote(440, 500); 
  delay(100);          
}

void playNote(int frequency, int duration) {
  tone(buzzPin, frequency, duration);
  delay(duration);
  noTone(buzzPin);
}