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

// Pin definitions
#define DHTPIN 4
#define DHTTYPE DHT22

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

// Initialize the LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600); // Initialize serial communication for debugging
  dht.begin();       // Initialize the DHT sensor
  lcd.init();        // Initialize the LCD
  lcd.backlight();   // Turn on the LCD backlight
}

void loop() {
  // Read humidity and temperature
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temperature)) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Failed to read");
    lcd.setCursor(0, 1);
    lcd.print("from sensor!");
    delay(3000);
    return;
  }

  // Print sensor readings to serial monitor for debugging
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("%\tTemperature: ");
  Serial.print(temperature);
  Serial.println("C");

  // Format the readings to 2 decimal places
  char humStr[6];
  dtostrf(humidity, 5, 2, humStr);
  char tempStr[6];
  dtostrf(temperature, 5, 2, tempStr);

  // Display the results on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Humidity=");
  lcd.print(humStr);
  lcd.print("%");

  lcd.setCursor(0, 1);
  lcd.print("Temp=");
  lcd.print(tempStr);
  lcd.print("C");

  // Wait for 3 seconds before the next update
  delay(3000);
}