/* How to use the DHT-21 sensor with Arduino uno
   Temperature and humidity sensor
   More info: http://www.ardumotive.com/how-to-use-dht-21-sensor-en.html
   Dev: Michalis Vasilakis // Date: 19/11/2016 // www.ardumotive.com */
 
// Libraries
#include <dht.h>
dht DHT;
 
// Constants
#define DHT21_PIN 2     // DHT 22  (AM2302) - what pin we're connected to
 
// Variables
float hum;  // Stores humidity value
float temp; // Stores temperature value
 
void setup() {
    Serial.begin(9600);
}
 
void loop() {
    int chk = DHT.read21(DHT21_PIN);
    // Read data and store it to variables hum and temp
    hum = DHT.humidity;
    temp = DHT.temperature;
    // Print temp and humidity values to serial monitor
    Serial.print("Humidity: ");
    Serial.print(hum);
    Serial.print(" %, Temp: ");
    Serial.print(temp);
    Serial.println(" Celsius");
    delay(2000); // Delay 2 sec.
}