int buzzerPin=7;
void setup() {
  // put your setup code here, to run once:
 pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 tone(buzzerPin,500,1500);
 delay(500);
 noTone(buzzerPin);
 delay(500);
 tone(buzzerPin,400,1500);
 delay(1500);
}