int SwitchState=0;
void setup(){
  pinMode(13, INPUT);//The button activating the siren and lights is an input
 pinMode(12, OUTPUT);//the red light is an output
 pinMode(11, OUTPUT);//the blue lught is an output
 pinMode(10, OUTPUT);//the buzzer is also an output
}
 

void loop()
{
SwitchState = digitalRead(13);//The switchstate is the reading of the button
if (SwitchState ==LOW){  //if the switch is off
digitalWrite(12, LOW);//light off
digitalWrite(11, LOW);//light off
}
else {
  digitalWrite(12, HIGH);//light on
  digitalWrite(11, LOW);//light off
  tone(10, 659.25);//high pitched tone
  delay(500);//wait half second
  digitalWrite(12, LOW);//light off
  digitalWrite(11, HIGH);//light on
   tone(10, 329.63);//low pitched tone
  delay (500);//wait half a second
noTone(10);//if button is not pressed there should be no sound
}

}