#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

unsigned long lastReadTime = 0;

void setup() {
  Serial.begin(115200);
  dht.begin();

  Serial.println("Smart Campus: DHT22 Sensor Initialized");
  Serial.println("--------------------------------------");
}

void loop() {
  unsigned long currentTime = millis();

  if (currentTime - lastReadTime >= 2000) {

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

    if (isnan(temperature) || isnan(humidity)) {
      Serial.println("ERROR: Sensor read failure! Check wiring.");
    } else {
      Serial.print("Temp: ");
      Serial.print(temperature);
      Serial.print(" °C | Humidity: ");
      Serial.print(humidity);
      Serial.println(" %");
    }


    lastReadTime = currentTime;
  }
}