// Coding untuk Ultrasonic sensor
#include <ESP32Servo.h>

#define TRIG_PIN  23  // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN  22 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
#define DISTANCE_THRESHOLD  16 // centimeters
#define LED_PIN 14
#define SERVO_PIN  12

Servo servo; // create servo object to control a servo

// variables will change:
float duration_us, distance_cm;

void setup() {
  Serial.begin (9600);       // initialize serial port
  pinMode(TRIG_PIN, OUTPUT); // set ESP32 pin to output mode
  pinMode(ECHO_PIN, INPUT);  // set ESP32 pin to input mode
  pinMode(LED_PIN, OUTPUT);
  servo.attach(SERVO_PIN);   // attaches the servo on pin 12 to the servo object
  pinMode(LED_PIN, OUTPUT);
}

int pos = 0;

void loop() {
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN, HIGH);
  // calculate the distance
  distance_cm = 0.017 * duration_us;

  if (distance_cm < DISTANCE_THRESHOLD)
  {
    for(pos=0;pos<=360;pos++)
{
servo.write(pos);
 delay(15);
}
    servo.write(pos);
    digitalWrite(14, HIGH);
    //delay(2000);
  }
  else
  {
    servo.write(0);
    digitalWrite(14, LOW);
  }

  
  // print the value to Serial Monitor
  Serial.print("distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

delay(500);

}

/* int pos = 0;
void loop()
{
 for(pos=0;pos<=180;pos++)
{
servo.write(pos);
 delay(15);
 } */