1.) Connect DHT22 Sensor to Raspberry Pi
On howto connect your raspberry to your sensors please read one of those helpfull articles
http://www.test-wetterstation.de/temperaturmessung-mit-dem-raspberry-pi
http://www.instructables.com/id/Raspberry-PI-and-DHT22-temperature-and-humidity-lo/
http://www.rototron.info/dht22-tutorial-for-raspberry-pi/
2.) Setup Raspberry Pi, boot and connect to via ssh
3.) Do some post setup stuff and install some essentials
pi@rapi:$ sudo apt-get update pi@rapi:$ sudo apt-get upgrade pi@rapi:$ sudo apt-get install build-essential python-dev pi@rapi:$ cd /opt
4,) Install adafruit
pi@rapi:$ sudo mkdir adafruit pi@rapi:$ cd adafruit/ pi@rapi:$ sudo wget https://github.com/adafruit/Adafruit_Python_DHT/archive/master.zip pi@rapi:$ sudo unzip master.zip pi@rapi:$ cd Adafruit_Python_DHT-master/ pi@rapi:$ sudo python setup.py install pi@rapi:$ cd /opt/adafruit/Adafruit_Python_DHT-master/examples
5.) Test your DHT22 sensor device
pi@rapi:$ python AdafruitDHT.py 22 4 Temp=23.9* Humidity=44.3%
6 .) Create a small python script and test it
pi@rapi:$ python readSensorData.py 22 4
7.) Add your script to rc.local and reboot
pi@rapi:$ sudo mcedit rc.local (use any editor your are used to) (sleep 10; python /opt/dataLogger/readSensorData.py 22 4)& exit 0
Working sample: https://datalogger.html5live.at/public/
Using SensorLogger for ownCloud to store data and visualize
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