#include "DHT.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define DHTPIN 12    
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

// LCD I2C (address 0x27 or 0x3F depending on your module)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() 
{
  Serial.begin(9600);
  Serial.println(F("Group 1 - DHT22"));

  pinMode(13, INPUT);

  dht.begin();

  // Initialize I2C LCD
  lcd.init();      
  lcd.backlight();
  lcd.print("ESP32 System");
}

void loop() {
  delay(2000);

  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  int M = analogRead(13);
  int G = map(M,0,4095,0,100);
  Serial.print("The Gas Value is : ");
  Serial.print(G);
  Serial.println("%");

  Serial.print("The temperature is : ");
  Serial.println(t);
  Serial.print("The Humidity is : ");
  Serial.println(h);

  lcd.clear();
  lcd.print("Temp : ");
  lcd.print(t);
  delay(500);

  lcd.clear();
  lcd.print("Hum : ");
  lcd.print(h);
  delay(500);

  lcd.clear();
  lcd.print("Gas : ");
  lcd.print(G);
  lcd.print("%");
  delay(500);
}