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

#include "DHT.h"

#define DHTPIN 8     // 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");
}