//Muhammad Raqhib hamdi
//2021230037
//Unsada Teknologi Informasi
//Lab 3.9 ESP 32
//Sensor ultrasonik mengirimkan gelombang suara ke objek, kemudian mengukur waktu yang diperlukan untuk gelombang tersebut dipantulkan kembali. Dengan menggunakan waktu tunda ini, sensor dapat menghitung jarak antara dirinya dan objek.
#include <NewPing.h>
#define TRIGGER_PIN  15 
#define ECHO_PIN     2  
#define MAX_DISTANCE 300
#define LED_PIN_1 4    
#define LED_PIN_2 5    
#define LED_PIN_3 18   
#define LED_PIN_4 19   
#define BUZZER_PIN 13  
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
void setup() {
  Serial.begin(9600);
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
  pinMode(LED_PIN_3, OUTPUT);
  pinMode(LED_PIN_4, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  delay(50);
  unsigned int distance = sonar.ping_cm();

  if (distance > 50) {
    digitalWrite(LED_PIN_1, HIGH);
  } else {
    digitalWrite(LED_PIN_1, LOW);
  }

  if (distance > 100) {
    digitalWrite(LED_PIN_2, HIGH);
  } else {
    digitalWrite(LED_PIN_2, LOW);
  }

  if (distance > 200) {
    digitalWrite(LED_PIN_3, HIGH);
  } else {
    digitalWrite(LED_PIN_3, LOW);
  }

  if (distance > 300) {
    digitalWrite(LED_PIN_4, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN_4, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }
}