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

// Define the pins for the ultrasonic sensor
#define TRIGGER_PIN  9
#define ECHO_PIN     10
#define MAX_DISTANCE 400 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
#define BuzzerPin 12
float hight;
float redious=365.764;
// Define the pin for the pump
#define PUMP_PIN 7

// Define the water level threshold points
#define LOW_THRESHOLD  20 // Water level below this threshold, turn on the pump
#define HIGH_THRESHOLD 90 // Water level above this threshold, turn off the pump
#define DANGER_THRESHOLD 95 // Water level above this threshold, turn off the pump

// Create an instance of the NewPing library
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // Set the pump pin as an output
  pinMode(PUMP_PIN, OUTPUT);
  pinMode(BuzzerPin, OUTPUT);

  // Initialize serial communication
  Serial.begin(9600);

  // Initialize the LCD
  lcd.init();
  lcd.backlight();

  // Print initial messages on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Water Level:");

  lcd.setCursor(0, 1);
  lcd.print("Pump Status:");
}

void loop() {
  // Measure distance using ultrasonic sensor
  int distance = sonar.ping_cm();

  // Check if there's an error in distance measurement
  if (distance == 0) {
    Serial.println("Error: Distance measurement failed!");
    return;
  }

  // Print the distance measured on the serial monitor
  float hight = 400-distance;
  int waterquantity = map(distance, 0, 400, 100, 0);

 Serial.print("Water Level:  ");
  Serial.print(waterquantity);
  Serial.println(" %");
  // Display the distance on the LCD
  lcd.setCursor(12, 0);
  lcd.print("    "); // Clear previous value
  lcd.setCursor(12, 0);
  lcd.print(waterquantity );
  lcd.print("%");
  measured_volume(hight,redious);
  

  // Check if the water level is below the low threshold
  if ((waterquantity  <= LOW_THRESHOLD))
  {
    // Water level is low, turn on the pump
    digitalWrite(PUMP_PIN, HIGH);
    digitalWrite(BuzzerPin, LOW);
    Serial.println("Water level low! Pump turned on.");
    // Update pump status on the LCD
    lcd.setCursor(12, 1);
    lcd.print("ON ");
  } 
  // Check if the water level is above the high threshold
  else if ((waterquantity  >= HIGH_THRESHOLD) )
  
   {
    // Water level is high, turn off the pump
    digitalWrite(PUMP_PIN, LOW);
    digitalWrite(BuzzerPin, LOW);
    Serial.println("Water level high! Pump turned off.");
    // Update pump status on the LCD
    lcd.setCursor(12, 1);
    lcd.print("OFF");
  }

   if ((waterquantity >= DANGER_THRESHOLD) )
  
   {
    // Water level is high, turn off the pump
    digitalWrite(BuzzerPin, HIGH);
    //Serial.println("Water level high! Pump turned off.")
    // Update pump status on the LCD
    lcd.setCursor(12, 1);
    lcd.print("@*@");
  }


  // Delay before next measurement
  delay(1000); // Adjust delay time as needed
}
void mesured_volume(float h, float r )
{
  float volume = (3.14*(r^2)*h);

Serial.print(volume);
}