DHT22 sensor with Arduino Uno and print temperature and humidity readings.

Objective: To interface DHT11 sensor with Arduino Uno and write a program to print temperature and humidity readings.

Code: 

/* How to use the DHT-22 sensor with Arduino uno

   Temperature and humidity sensor

*/

//Libraries

#include <DHT.h>;

//Constants

#define DHTPIN 7     // what pin we're connected to

#define DHTTYPE DHT22   // DHT 22  (AM2302)

DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino

//Variables

int chk;

float hum;  //Stores humidity value

float temp; //Stores temperature value

void setup()

{

  Serial.begin(9600);

  dht.begin();

}

void loop()

{

    delay(2000);

    //Read data and store it to variables hum and temp

    hum = dht.readHumidity();

    temp= dht.readTemperature();

    //Print temp and humidity values to serial monitor

    Serial.print("Humidity: ");

    Serial.print(hum);

    Serial.print(" %, Temp: ");

    Serial.print(temp);

    Serial.println(" Celsius");

    delay(10000); //Delay 2 sec.

}

   

Output: