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

// Ultrasonic Sensor pins
#define TRIGGER_PIN 5
#define ECHO_PIN 18
#define MAX_DISTANCE 200 // Maximum distance to measure (in cm)

// Buzzer pin
#define BUZZER_PIN 19

// Initialize ultrasonic sensor
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

// Initialize I2C LCD display with the I2C address (usually 0x27) and size (16x2)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(115200);
  pinMode(BUZZER_PIN, OUTPUT);
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the LCD backlight
}

void loop() {
  // Measure distance
  unsigned int distance = sonar.ping_cm();

  // Display on LCD
  lcd.setCursor(0, 0);
  lcd.print("Water Level:");
  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" cm");

  // Check water level and sound alarm if necessary
  if (distance < 10) { // Adjust threshold as needed
    digitalWrite(BUZZER_PIN, HIGH);
  } else if (distance > 150) { // Adjust threshold as needed
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(1000); // Wait for a second before the next measurement
}