// Example testing sketch for various DHT humidity/temperature sensors
            // Written by ladyada, public domain

            #include "DHT.h"

            #define DHTPIN 2     // what pin we're connected to

            // Uncomment whatever type you're using!
            #define DHTTYPE DHT11   // DHT 11 
            //#define DHTTYPE DHT22   // DHT 22  (AM2302)
            //#define DHTTYPE DHT21   // DHT 21 (AM2301)

            // Connect pin 1 (on the left) of the sensor to +5V
            // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
            // to 3.3V instead of 5V!
            // Connect pin 2 of the sensor to whatever your DHTPIN is
            // Connect pin 4 (on the right) of the sensor to GROUND
            // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

            // Initialize DHT sensor for normal 16mhz Arduino
            DHT dht(DHTPIN, DHTTYPE);
            // NOTE: For working with a faster chip, like an Arduino Due or Teensy, you
            // might need to increase the threshold for cycle counts considered a 1 or 0.
            // You can do this by passing a 3rd parameter for this threshold.  It's a bit
            // of fiddling to find the right value, but in general the faster the CPU the
            // higher the value.  The default for a 16mhz AVR is a value of 6.  For an
            // Arduino Due that runs at 84mhz a value of 30 works.
            // Example to initialize DHT sensor for Arduino Due:
            //DHT dht(DHTPIN, DHTTYPE, 30);

            void setup() {
              Serial.begin(9600); 
              Serial.println("DHTxx test!");
             
              dht.begin();
            }

            void loop() {
              // Wait a few seconds between measurements.
              delay(2000);

              // Reading temperature or humidity takes about 250 milliseconds!
              // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
              float h = dht.readHumidity();
              // Read temperature as Celsius
              float t = dht.readTemperature();
              // Read temperature as Fahrenheit
              float f = dht.readTemperature(true);
              
              // Check if any reads failed and exit early (to try again).
              if (isnan(h) || isnan(t) || isnan(f)) {
                Serial.println("Failed to read from DHT sensor!");
                return;
              }

              // Compute heat index
              // Must send in temp in Fahrenheit!
              float hi = dht.computeHeatIndex(f, h);

              Serial.print("Humidity: "); 
              Serial.print(h);
              Serial.print(" %\t");
              Serial.print("Temperature: "); 
              Serial.print(t);
              Serial.print(" *C ");
              Serial.print(f);
              Serial.print(" *F\t");
              Serial.print("Heat index: ");
              Serial.print(hi);
              Serial.println(" *F");
            }