Creating a Data loger room conditions to record the condition of temperature, relative humidity, and air pressure in the room becomes relatively easy. for who do not know what it actually Arduino is a programmable micro controller using a PC, due to the ease and pretty much causes Arduino community has advantages compared to the "other" micro-controller development.
Technical Spec of the data logger.
inputs. Internal and external temperature, relative humidity sensors, and air pressure sensor (barometer)
serial output via USB and LCD monochrome.
Optional LAN and micro SD.
Video 1 .Data logger: Arduino +BMP085 + SHT11+ LCD
Video 2 .Data logger: Arduino +BMP085 + LCD
Step 1: Arduino + BMP 085
For Detail reference reffer this following address (including the library)
Assuming you are familiar using Arduino and Arduino IDE , the library should extract to arduino library folder , make sure the "include" file is the same as *.cpp and *. h file
I include the zip file for trouble shooting this sensor(using ada fruit library)
I purchase this sensor & arduino from www.geraicerdas.com
Step 2: SHT-11 Temperature and Arduino
Step 3: Nokia 5110 LCD Display
Step 4: Future Works
To know the uncertainty of air density at room we can do average for 1 day maybe every 10 minnutes that why I planing to attach mini SD to the system.