#include "DHT.h"
#define  DHTPIN   5
#define  DHTTYPE DHT22
DHT dht(DHTPIN,DHTTYPE);
void setup()
      {
        Serial.begin(115200);
        Serial.println("DHTxx test !");

        dht.begin();
      }
void loop()
        {
          delay(2000);
          float h = dht.readHumidity();
          float t = dht.readTemperature();
          if (isnan(h)|| isnan(t))
                  {
                    Serial.println( "faild to read from dht sensor");
                    return;
                  }
          Serial.print("Humidity:  ");
          Serial.print(h);
          Serial.print("%  Temperature:  ");
          Serial.print(t);
          Serial.println(" ℃ ");
        }