#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT22
#define LED_PIN 2

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  static unsigned long lastSendTime = 0;
  unsigned long currentTime = millis();

  if (currentTime - lastSendTime >= 2000) { 
    lastSendTime = currentTime;

    float humidity = dht.readHumidity();
    float temperature = dht.readTemperature();

    if (isnan(humidity) || isnan(temperature)) {
      Serial.println("Failed to read from DHT sensor!");
      return;
    }

    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.print(" %\t");
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" C");
  }

  if (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    command.trim();
    if (command.equalsIgnoreCase("ON")) {
      digitalWrite(LED_PIN, HIGH);
    } else if (command.equalsIgnoreCase("OFF")) {
      digitalWrite(LED_PIN, LOW);
    }
  }
}