#include "DHT.h" //loading DHT library
#define DHTPIN 2 //Connect module to Pin 2    
#define DHTTYPE DHT11   

DHT dht(DHTPIN, DHTTYPE);

void setup() 
{
  Serial.begin(9600); 
  dht.begin(); 
}

void loop() 
{
  delay(2000); //Needs two seconds untill the module starts (needs time to load)
  float relative_humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  Serial.print("relative humidity: ");  
  Serial.print(relative_humidity); 
  Serial.println(" %");
  Serial.print("temperature: ");
  Serial.print(temperature);
  Serial.println(" °Celsius");
}