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   DHT-11 sensor is a anolog sensor that has three pins . It can be connected to arduino,raspberry pi etc., In this how to collect data from DHT-11 sensor and save it in a file is explained.

CIRCUIT DIAGRAM

Raspberry Pi                       DHT11 Module
5v P2              —————————–        VCC (V)
GND P6             —————————-        GND (G)
GPIO4 P7           —————————–        DATA (S)

PROCEDURE:

Open the terminal and type the following commands

Step 1: Enter sudo apt-get install git-core. If any error in installing git-core update the software using sudo apt-get update .

Step 2: Enter git clone https://github.com/adafruit/Adafruit_Python_DHT.git to clone the library.

Step 3: Open the folder using cd Adafruit_Python_DHT.

Step 4: Enter sudo apt–get install build–essential python–dev

Step 5 : Enter sudo python setup.py install to install setup.py

Step 6: Enter sudo apt–get install python–dev python–rpi.gpio  to install GPIO if it is not installed

PROGRAMS :

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import sys
import time
import Adafruit_DHT
localtime = time.asctime( time.localtime(time.time()) )
#To create a file to store the data
#Iam taking data for 10 minutes
for i in range(10):
    hum, temp = Adafruit_DHT.read_retry(11, 4)
    #Read value every one second
     time.sleep(60)
     print(localtime)
     print "\n"
     print("Temperature = %d "%temp)
     print "\n"
     print("Humidity = %d "%hum)
     print "\n"

Save this as run the program ,data will be printed every one minute .

THANKYOU