#include <LiquidCrystal_I2C.h> // Library untuk LCD I2C
int trig_pin = 6; // Mendefinisikan pin trigger ultrasonik
int echo_pin = 5; // Mendefinisikan pin echo ultrasonik
int pompa_air = 7; // Mendefinisikan pin pompa air
long duration, distance; // Variabel untuk menyimpan waktu pantulan ultrasonik

LiquidCrystal_I2C lcd(0x27, 16, 2); // Inisialisasi LCD dengan alamat I2C 0x27, dan ukuran 16x2

void setup() {
  Serial.begin (9600);
  pinMode(trig_pin, OUTPUT);
  pinMode(echo_pin, INPUT);
  digitalWrite(trig_pin, LOW);
  pinMode(pompa_air, OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop() {
  digitalWrite(trig_pin, LOW);
  delayMicroseconds(2); 
  digitalWrite(trig_pin, HIGH);
  delayMicroseconds(10);
  duration = pulseIn(echo_pin, HIGH); 
  distance = (duration / 2) / 29.2; // Menghitung jarak dalam sentimeter berdasarkan durasi pantulan
  Serial.print(distance);
  Serial.println(" cm");
  
  if (distance >= 200){
    digitalWrite(pompa_air, HIGH); 
    lcd.setCursor(0, 0); 
    lcd.print("Ting.Air: ");
    lcd.setCursor(10, 0);  
    lcd.print(distance); 
    lcd.setCursor(13, 0); 
    lcd.print(" cm");
    lcd.setCursor(4,1);
    lcd.print("POMPA ON");
    delay(2000); 
    lcd.clear(); 
  } else if (distance <= 15){
    digitalWrite(pompa_air, LOW); 
    lcd.setCursor(0, 0);
    lcd.print("Tinggi Air: ");
    lcd.setCursor(11, 0); 
    lcd.print(distance);
    lcd.setCursor(13, 0); 
    lcd.print(" cm"); 
    lcd.setCursor(4,1);
    lcd.print("POMPA OFF");
    delay(2000); 
    lcd.clear();
  } 
}