int spin = 4; //speaker pin

void alarm(){
   for(int hz = 440; hz < 1000; hz++){
    tone(spin, hz, 50);
    delay(1);
  }
  noTone(spin);

  for(int hz = 1000; hz > 440; hz--){
    tone(spin, hz, 50);
    delay(1);
  }
  noTone(spin);
}

void setup() {
  // put your setup code here, to run once:
  pinMode(spin,OUTPUT); //beeper
  pinMode(5,OUTPUT); //sw
  digitalWrite(5,HIGH);
  alarm();
  alarm();
  digitalWrite(5,LOW);
}

void loop() {
}