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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Sesuaikan dengan alamat LCD dan ukurannya

#define TRIGGER_PIN 13
#define ECHO_PIN 12
#define BUZZER_PIN 2
#define LED_PIN 15

void setup() {
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Water Level Monitor");
  delay(2000);
  lcd.clear();
}

void loop() {
  long duration, distance;
  
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  
  duration = pulseIn(ECHO_PIN, HIGH);
  
  distance = duration * 0.034 / 2; // Mengubah durasi menjadi jarak dalam cm
  
  Serial.print("Level Air: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  lcd.setCursor(0, 0);
  lcd.print("Level Air: ");
  lcd.print(distance);
  lcd.print(" cm  ");
  
  if (distance < 20) {
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 1000); // Nyalakan buzzer
  } else {
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN); // Matikan buzzer
  }
  
  delay(1000);
}