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

// Pin definitions
#define DHTPIN 2     
#define DHTTYPE DHT11  
#define RELAY_PIN 2

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

// Initialize I2C LCD with address 0x27 (common address for 16x2 I2C LCDs)
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int sensorPin = A0; // Analog input pin that the temperature sensor is attached to
const int fanPin = 9; // Digital pin that the fan is connected to

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));

  dht.begin();

  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  lcd.print("Initializing...");

  pinMode (RELAY_PIN, OUTPUT);

  pinMode(fanPin, OUTPUT); // Set the digital pin as output
  Serial.begin(9600); // Start serial communication at 9600 bps
}

void loop() {
  // Wait a few seconds between measurements
  delay(2000);

  // Reading temperature and humidity
  float h = dht.readHumidity();
  float t = dht.readTemperature();      // Celsius
  float f = dht.readTemperature(true);  // Fahrenheit

  // Check if any reads failed and exit early (to try again)
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    lcd.clear();
    lcd.print("Sensor Error!");
    return;
  }

  // Compute heat index in Celsius and Fahrenheit
  float hic = dht.computeHeatIndex(t, h, false);
  float hif = dht.computeHeatIndex(f, h);

  // Print to Serial Monitor
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));

  // Display temperature and humidity on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);  // Set cursor to first line
  lcd.print("Temp: ");
  lcd.print(t);
  lcd.print(" C");

  lcd.setCursor(0, 1);  // Set cursor to second line
  lcd.print("Humidity: ");
  lcd.print(h);
  lcd.print(" %");

digitalWrite(RELAY_PIN, LOW);
delay(2000);
digitalWrite(RELAY_PIN, HIGH);
delay(2000);
}

int sensorValue = analogRead(sensorPin); // Read the analog input

float voltage = sensorValue * (5.0 / 1023.0); // Convert the analog value to voltage
float temperatureC = (voltage - 0.5) * 100.0; // Convert the voltage to temperature in Celsius

 if (temperatureC > 60.0);
{
  digitalWrite(fanPin, HIGH); // Turn the fan on
  Serial.println("Fan is ON");
 } else {
  digitalWrite(fanPin, LOW); // Turn the fan off
  Serial.println("Fan is OFF");
}

  delay(1000); // Wait for a second before reading again

{