Humidity and Temperature Sensor

The DHT11 is a pre-calibrated digital output temperature and humidity sensor. The sensor sends both the temperature and humidity information on the digital pin. The attached libary is required to get the information separately.

Download Humidity and Temperature Lib from here DHTlib and place it in \Documents\Arduino\libraries

Code

//
// FILE: dht11_test.ino
// AUTHOR: Rob Tillaart
// VERSION: 0.1.01
// PURPOSE: DHT library test sketch for DHT11 && Arduino
// URL:
//
// Released to the public domain
//

#include <dht.h>

dht DHT;

#define DHT11_PIN 5

void setup()
{
Serial.begin(115200);
Serial.println("DHT TEST PROGRAM ");
Serial.print("LIBRARY VERSION: ");
Serial.println(DHT_LIB_VERSION);
Serial.println();
Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");
}

void loop()
{
// READ DATA
Serial.print("DHT11, \t");
int chk = DHT.read11(DHT11_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;
case DHTLIB_ERROR_CONNECT:
Serial.print("Connect error,\t");
break;
case DHTLIB_ERROR_ACK_L:
Serial.print("Ack Low error,\t");
break;
case DHTLIB_ERROR_ACK_H:
Serial.print("Ack High 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(2000);
}
//
// END OF FILE
//