#include <DHT.h>

#define DHTPIN 21           
#define DHTTYPE DHT22       
DHT dht(DHTPIN, DHTTYPE);   

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

void loop()
 {  
  delay(2000);                                     
  float humidity = dht.readHumidity();             
  float temperature = dht.readTemperature();       
  if (isnan(humidity) || isnan(temperature))       
  {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Print the results to the Serial Monitor
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");
}