Reading DHT22 (or DHT11) with Arduino

1#include<DHT.h>      // Including library for dht
2
3#define dht_dpin  12       //digital pin, that DHT's data line is connected
4#define DHTTYPE DHT22     //When using DHT11, put here DHT11 instead of DHT22
5DHT dht(12,DHT22);        //Not  sure, what this line excatly does, but same aplies here as above
6
7//int temp;               //Use for DHT11 instead of float
8float temp;               //Use  float for showing decimals of the temperature reading. I recommend using for DHT22,  no point to use for DHT11
9
10//int hum;                //Use for DHT11 instead  of float
11float hum;                //Use float for showing decimals of the humidity  reading. I recommend using for DHT22, no point to use for DHT11
12
13void setup()  {
14  
15Serial. begin(9600);      //Initiate serial monitor
16 dht.begin();             //Initiate DHT sensor
17 
18}
19
20void loop() {
21
22//delay(1000);                          //wait a sec (recommended for DHT11)  
23delay(500);                           //wait a 0,5 sec (recommended for DHT22)
24
25temp=dht.readTemperature(false);       //Read temperature of DHT and store it in to variable (temp). FALSE reads  in celsius, leave empty for farenheit
26hum=dht.readHumidity();               //Read  humidity of DHTand store it iin variable (hum).
27
28Serial.print("Temperature:  ");        //Print text "Temperature: " in to serial monitor
29Serial.println(temp);                 //Print variable (temperature value) in to serial port. ln for  line break
30
31Serial.print("Humidity: ");           //Print text "Humidity:  " in to serial monitor
32Serial.println(hum);                  //Print variable  (temperature value) in to serial port. ln for line break
33Serial.println(" ");                  //print empty line in to serial monitor
34    
35  delay(2500);                        //optional delay, not really any point reading the sensor  more than once every 3 seconds
36}