#include <DHT.h>
#include <LiquidCrystal.h> // Library for LCD

#define DHTPIN 5
#define DHTTYPE DHT22
#define LED_PIN 3
#define BUZZER_PIN 8
#define LCD_RS 12  // Register select pin
#define LCD_EN 11  // Enable pin
#define LCD_D4 6   // Data pin 4 // Changed from 5 to avoid conflict with DHTPIN
#define LCD_D5 4   // Data pin 5
#define LCD_D6 3   // Data pin 6
#define LCD_D7 2   // Data pin 7

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal lcd(LCD_RS, LCD_EN, LCD_D4, LCD_D5, LCD_D6, LCD_D7);

void setup() {
  Serial.begin(9600);
  dht.begin();
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  // Initialize the LCD
  lcd.begin(16, 2); // 16x2 character LCD
  lcd.setCursor(0, 0);
  lcd.print("Humidity: ");
  lcd.setCursor(10, 0);
  lcd.print("%");
  
  lcd.setCursor(0,1); // Added this line to print temperature on the second row of the LCD
  lcd.print("Temp: ");
  lcd.setCursor(10,1);
  lcd.print("C");

  digitalWrite(LED_PIN, LOW); // Turn off the LED initially
  noTone(BUZZER_PIN); // Turn off the buzzer initially
}

void loop() {
  delay(2000);

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read sensor data.");
    return;
  }

  lcd.setCursor(10,0); // Moved this line to update the humidity value on the first row of the LCD
  lcd.print(humidity);

  
lcd.setCursor(10,1); // Added this line to update the temperature value on the second row of the LCD
lcd.print(temperature);

if (temperature >= 20.0 && temperature <= 25.0 && humidity >=40 && humidity <=70) {
    noTone(BUZZER_PIN); // Turn off the buzzer
    digitalWrite(LED_PIN, LOW); // Turn off the LED
    Serial.println("Safe Conditions");
} else if (temperature >=20.0 && temperature <=25.0) {
    tone(BUZZER_PIN,200); // Changed from 100 to make it more distinct from polluted or dangerous conditions
    digitalWrite(LED_PIN,HIGH); // Turn on the LED
    Serial.println("Normal Conditions");
} else {
    tone(BUZZER_PIN,100); 
    digitalWrite(LED_PIN,HIGH); // Turn on the LED
    Serial.println("Polluted or Dangerous Conditions");
}
}