Temperature and Humidity data send to Bluetooth using Smart phone and Arduino

Temperature and Humidity data send to Bluetooth using Smart phone and Arduino:

#include <dht.h>

dht DHT;


#define DHT22_PIN 4

void setup()
{
    Serial.begin(9600);
    Serial.println("DHT value ");
    Serial.print("LIBRARY VERSION: ");
    Serial.println(DHT_LIB_VERSION);
    Serial.println();
    Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");
}

void loop()
{
    // READ DATA
    Serial.print("DHT22, \t");
    int chk = DHT.read22(DHT22_PIN);
    switch (chk)
    {
        case DHTLIB_OK:
            Serial.print("OK,\t");
            break;
        case DHTLIB_ERROR_CHECKSUM:
            Serial.print("Checksum error,\t");
            break;
        case DHTLIB_ERROR_TIMEOUT:
            Serial.print("Time out error,\t");
            break;
        default:
            Serial.print("Unknown error,\t");
            break;
    }
    // DISPLAY DATA
    Serial.print(DHT.humidity, 1);
    Serial.print(",\t");
    Serial.println(DHT.temperature, 1);

    delay(5000);

}

Circuit Diagram: