#include <DHT.h>

// DHT22 sensor pin
#define DHTPIN 2

// DHT22 type
#define DHTTYPE DHT22

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

const int ledPin = 13;  // LED pin

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);  // Ensure LED is off initially

  // Initialize serial communication
  Serial.begin(9600);

  // Initialize DHT sensor
  dht.begin();

  // Initial message
  Serial.println("DHT22 and LED Control");
}

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

  // Reading temperature or humidity takes about 250 milliseconds!
  float h = dht.readHumidity();
  float t = dht.readTemperature();

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

  // Print the readings to the Serial Monitor
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print("%  Temperature: ");
  Serial.print(t);
  Serial.println("°C");

  // Control LED based on temperature
  if (t > 20.0) {  // If temperature is above 25°C
    digitalWrite(ledPin, HIGH);  // Turn on LED
    Serial.println("LED ON");
  } else {
    digitalWrite(ledPin, LOW);  // Turn off LED
    Serial.println("LED OFF");
  }
}