//Interfacing ultrasonic sensor and lcd with aurdino 

#include <LiquidCrystal.h>

// Define the LCD object
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Define the pins for the ultrasonic sensor
const int trigPin = 9;
const int echoPin = 10;
const int BUZZER = 6;
const int red = 7;
const int blue = 8;

void setup() {
  // Initialize the LCD
  lcd.begin(16, 2);

  // Initialize the ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(BUZZER, OUTPUT);  
  noTone(BUZZER);
   
  // Set up the serial communication for debugging (optional)
  Serial.begin(9600);
}

void loop() {
  // Trigger the ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the pulse duration from the echo pin
  long duration = pulseIn(echoPin, HIGH);

  // Calculate distance in centimeters (you can change this for inches)
  float distance_cm = duration * 0.034 / 2;

  // Display the distance on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Water Level: ");
  lcd.setCursor(0,1);
  lcd.print(distance_cm);
  lcd.print(" cm");
  lcd.setCursor(8,1);
  if(distance_cm >= 11 && distance_cm <= 20){
    lcd.setCursor(10,1);
    lcd.print("LOW");
    digitalWrite(blue,HIGH);
    tone(BUZZER, 500);  
   delay(300);  
   noTone(BUZZER); 
   delay(3000);
   digitalWrite(blue,LOW); 
   delay(3000);
   
    }
    else if(distance_cm <= 2.5){
      lcd.print("Overflow");
      digitalWrite(red,HIGH);
       tone(BUZZER, 300);  
       delay(2000);  
       noTone(BUZZER); 
       delay(3000);
      digitalWrite(red,LOW);
      delay(3000);
      
      }

  // Print the distance to the serial monitor (optional)
  Serial.print("Water Level: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  // Add a delay before taking the next measurement
  delay(1000); // You can adjust this delay as needed
}