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

// Define the DHT22 sensor type and the pin it is connected to
#define DHTPIN 4       // ESP32 pin connected to the DHT22 data pin
#define DHTTYPE DHT22  // DHT 22 (AM2302)

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize the LCD with the I2C address (0x27) and set it to a 16x2 display
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // Start the serial communication
  Serial.begin(115200);
  
  // Initialize the LCD and turn on the backlight
  lcd.begin();
  lcd.backlight();
  
  // Initialize the DHT sensor
  dht.begin();

  // Print the startup message on the LCD
  lcd.setCursor(0, 0);  // Start at the first row
  lcd.print("Temp & Humidity");
  delay(2000);  // Wait for 2 seconds
}

void loop() {
  // Reading temperature and humidity from DHT22 sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reading failed
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!    ");
    return;
  }

  // Print temperature and humidity to Serial Monitor
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");

  // Display temperature and humidity on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);  // First row
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);  // Second row
  lcd.print("Hum: ");
  lcd.print(humidity);
  lcd.print(" %");

  // Wait for 2 seconds before taking the next reading
  delay(2000);
}