#include <DHT.h>

#define DHTPIN 15     // Digital pin connected to the DHT22 sensor
#define DHTTYPE DHT22 // DHT 22  (AM2302)

DHT dht(DHTPIN, DHTTYPE);

#define LED_PIN 4
#define RELAY_PIN 5

void setup() {
  Serial.begin(9600);
  dht.begin();
  pinMode(LED_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
}

void loop() {
  delay(2000);
  float temperature = dht.readTemperature();
  if (!isnan(temperature)) {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" *C");
    if (temperature >= 30) {
      digitalWrite(LED_PIN, HIGH);
      digitalWrite(RELAY_PIN, HIGH);  // Activate relay to turn on LED
    } else {
      digitalWrite(LED_PIN, LOW);
      digitalWrite(RELAY_PIN, LOW);   // Deactivate relay to turn off LED
    }
  }
}