#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // Address LCD I2C 20x4

const int trigPin = 23; // Trig pin sensor HC-SR04
const int echoPin = 26; // Echo pin sensor HC-SR04
const int buzzerPin = 25; // Pin buzzer

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Water Tank Level:");
}

void loop() {
  long duration;
  int distance;

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  lcd.setCursor(0, 1);
  if (distance >= 155) {
    lcd.print("Tank Level: 5");
  } else if (distance <= 10) {
    lcd.print("Tank Level: 100%");
    digitalWrite(buzzerPin, HIGH);
  } else {
    int level = map(distance, 155, 10, 5, 100);
    lcd.print("Tank Level: " + String(level) + "%");
    digitalWrite(buzzerPin, LOW);
  }
  delay(500); // Delay untuk mengurangi kecepatan pembacaan sensor
}