At first i want to know what is the IC number for available humidity sensor?
i want to get an analog voltage from the output of humidity sensor and then want to process the signal in a wireless medium and get the analog voltage to a receiver.how can i do it?pls help me...i have a very important project on it..

 

http://www.google.com/search?hl=en&q=%2B%22humidity+sensor%22 produced over 350,000 results

 

Try this:
http://www.edn.com/article/CA179579.html
Link to PDF version: http://www.edn.com/contents/images/110801di.pdf
It's the last design idea in the PDF. Doesn't get much more simple than that.
Many more ideas here:
http://www.discovercircuits.com/S/s-humidity.htm

 

i need the ic number of humidity sensor first.the output of humidity sensor should be an analog voltage.

 

This is starting to sound like a homework assignment for a class. Is it?

This Google search:
http://www.google.com/search?hl=en&q=humidity+sensor+IC
immediately produced direct links to two humidity sensor IC's, an HC-610 and HC-700.