#include <Servo.h>
int trigPin = 11;
int echoPin = 12;
long jarak, waktu;
Servo servonya;
void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  servonya.attach (5);


}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  waktu = pulseIn (echoPin, HIGH);
  jarak = waktu* 0.034/2;
  Serial.println (jarak);
  delay (100);

  if (jarak < 50){
    servonya.write (180);
    delay (200);
  }else {
    servonya.write (0);
    delay (200);
  }

}