void setup() {
  // put your setup code here, to run once:
  pinMode(7, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(4, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(4)==1)
  {
    digitalWrite(7, HIGH);
    delay(0);
    tone(2,17000,0);
  }
  else 
  {
    digitalWrite(7,LOW);
    delay(0);
    tone(2,0,500);
   
  }

}