#include "DHT.h"

#define DHTPIN 2     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  Serial.println(F("Fire alarm test"));
  dht.begin();
}

void loop() {
  float roomTemperature = dht.readTemperature();

  if (isnan(roomTemperature)) {
    Serial.println(F("Trouble monitor alarm. Failed to read the temperature from DHT sensor!"));
    return;
  }

  printRoomTemperature(roomTemperature);

  if (roomTemperature > 20) {
    Serial.println(F("Fire alarm active!"));
  }

  delay(2000);
}

template <typename T>
void printRoomTemperature(T roomTemperature)
{
  Serial.print(F("Room temperature: "));
  Serial.print(roomTemperature);
  Serial.println(F("°C "));
}