#include <Servo.h>
  Servo myservo;
  int objek_jarak=0;
  int pintu_status=0;
  long readUltrasonicDistance(int pin)
  { 
    pinMode(pin, OUTPUT);
    digitalWrite(pin, LOW);

    digitalWrite(pin, HIGH);
    digitalWrite(pin, LOW);
    pinMode(pin, INPUT);

    return pulseIn(pin,HIGH);
  }
void setup() 
{
  pinMode(3, INPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  myservo.attach(2);
}
void loop() 
{
  objek_jarak=0;
  objek_jarak=0.01723 * readUltrasonicDistance(10);

  if(objek_jarak<100){
    if(pintu_status<1){
      myservo.write(180);
      delay(500);
      tone(5,420,500);

      digitalWrite(4, HIGH);
      delay(5000);
      pintu_status=1;
    }
  }
else {
  if(pintu_status>0){
    delay(5000);
    tone(5,520,300);
    digitalWrite(4, LOW);
    delay(1000);
    myservo.write(0);
    delay(5000);

    pintu_status=0;
   }
 }
}