#define BUZZER_PIN  13

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

void loop() {
  for (int i = 100; i <= 1000; i += 100) 
  {
    tone(BUZZER_PIN, i);
    delay(500);
  }
  noTone(BUZZER_PIN);
  delay(1000);
}