#include <Servo.h>
#define ECHO_PIN 4
#define TRIG_PIN 5
int servoPin = 3;
Servo servo;
int angle = 0;  // servo position in degrees

void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  Serial.begin(9600);
  servo.write(LOW);
    servo.attach(servoPin);
}
void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  int y = (2E-06*distance*distance) + (1.0051*distance)  + 0.0575;
  Serial.print("Jarak: ");
  Serial.println(y);
  delay(100);
  if(y < 20 ){
    servo.write(90);
    delay(15);
  }
 else{
   servo.write(0);
 }
    
}