#include <LiquidCrystal_I2C.h>
#include <NewPing.h>

// Define pins for the ultrasonic sensor
#define TRIG_PIN 2
#define ECHO_PIN 4
#define MAX_DISTANCE 400 // Maximum distance in cm

// Initialize NewPing
NewPing sonar(TRIG_PIN, ECHO_PIN, MAX_DISTANCE);

// Initialize LCD (I2C address is usually 0x27 or 0x3F)
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Define buzzer pin
#define BUZZER_PIN 23

void setup() {
  // Initialize LCD
  lcd.begin();
  lcd.backlight();
  
  // Set buzzer pin as output
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  // Measure distance
  delay(50); // Wait for sensor to stabilize
  float distance = sonar.ping_cm();

  // Check if water is detected within 10 cm
  if (distance > 0 && distance <= 10) {
    // Sound buzzer for 5 seconds
    digitalWrite(BUZZER_PIN, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Water Detected!");
    lcd.setCursor(0, 1);
    lcd.print("Distance: ");
    lcd.print(distance);
    lcd.print(" cm");
    delay(5000);
    digitalWrite(BUZZER_PIN, LOW);
  } else {
    // Display "Monitoring Level Water"
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Monitoring Level");
    lcd.setCursor(0, 1);
    lcd.print("Water");
  }
}