#include <EEPROM.h>
#include <LiquidCrystal.h>
#include <DHT.h>

LiquidCrystal lcd(2, 3, 4, 5, 6, 7); // LCD connections
DHT dht(8, DHT22); // DHT22 sensor connected to pin 8

const int buzzerPin = 12; // Buzzer pin
const int triggerPin = 9; // Ultrasonic sensor trigger pin
const int echoPin = 10;   // Ultrasonic sensor echo pin

long duration, inches;
int set_val, percentage;
bool state, pump;

void setup() {
  lcd.begin(16, 2);
  lcd.print("WATER LEVEL:");
  lcd.setCursor(0, 1);
  lcd.print("PUMP: OFF AUTO ");

  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);

  dht.begin(); // Initialize DHT sensor

  set_val = EEPROM.read(0);
  if (set_val > 150) set_val = 150; // Limit set_val to 150 (adjust according to your requirements)
}

void loop() {
  // Water level measurement
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  inches = microsecondsToInches(duration);
  percentage = (set_val - inches) * 100 / set_val;

  // Temperature and humidity measurement
  float temperature = dht.readTemperature(); // Read temperature
  float humidity = dht.readHumidity();       // Read humidity

  // Display water level, temperature, and humidity on LCD
  lcd.setCursor(12, 0);
  lcd.print(percentage);
  lcd.print("%   ");
  lcd.setCursor(0, 1);
  lcd.print("Temp:");
  lcd.print(temperature);
  lcd.print("C  Humidity:");
  lcd.print(humidity);
  lcd.print("%");

  // Pump control based on water level
  if (percentage < 30) { // If water level is below 30%
    pump = true;
    tone(buzzerPin, 1000); // Turn on buzzer with a frequency of 1000Hz
  } else {
    pump = false;
    noTone(buzzerPin); // Turn off buzzer
  }

  // Control the pump based on pump variable
  digitalWrite(12, pump ? HIGH : LOW);

  // Delay for stability
  delay(500);
}

long microsecondsToInches(long microseconds) {
  return microseconds / 74 / 2;
}