Hi.i want to make a wifi connection between my pc and a microcontroller to control my ip camera and some other inputs.
Please i want to tell me how i make this connection and how i control this inputs with my computer over wifi.I want to give an ip to my microcontroller because i want to send and receive data from it.
I want the software and the hardware parts to make it and some basic programming to make it.
It is a work for my university.
Do you want to send the video over the wi-fi link with an arduino? If so you will be disappointed as it is not fast enough, doesn't have the processing power and doesn't have the memory space to buffer the video.
If you are talking about just controlling where the camera is pointing then that is another matter.
i need something like this:
but i don't care about the web interface.i need to communicate over wifi connection and no in the internet.
i meen only a pc -> wifi transeiver -> (((air))))) --->> wifi transeiver -->>> adruino board --->>> camera and some others like as motor,temperature and potition of camera.
do you understand now?i m sorry for my bad enlish.
Asynclabs sell a WiFi shield for Arduino.
i don't care about the web interface.i need to communicate over wifi connection and no in the internet.
If I understood you correctly and you do not need to control the camera over the internet, using an RF link pair instead of WiFi maybe cheaper and easier.
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1268220866/2
The answer to your question is "It depends" 
If you want to process the video from the camera through the Arduino, the answer is "definitely no": that's too much data for the Arduino's limited memory and CPU. You would need to use a real "IP camera" that does the video conversion and Ethernet interface itself.
You will find many examples of people who have used Arduinos to control motors and read sensors for PCs. Most of those use the serial interface to the PC, but some use Ethernet. The Ethernet examples should adapt easily to the WiFi shield.
I have a feeling that one of those wireless routers that can be hacked to give it a serial port might be best. This would allow the IP traffic from the camera to be sent over wifi + control the arduino over the serial link
i need to communicate the camera with the pc over wifi,only this.wifi modem does not include in my project.it will be used in my next progects.
I'm not sure what you're trying to do... but here are some guesses and answers.
You have a WIFI IP camera connected to your PC via your LAN. So far so good... but there's nothing for the Arudino to do.
If your camera has BUILT IN motors to point it different directions, etc, then the camera's web interface is the place to go for controlling those motors.
If you want to build your OWN motor driven mount, to point the camera in different directions, and control that with the Arduino, then that is probably a sensible project. Or perhaps, for instance, you want to unlock a gate when you are happy with what you see via the camera. Again... a sensible use of an Arduino out there near the camera. Or perhaps you want to use sensors connected to the Arduino, and, for instance, record pictures only when the sensors "see" something. This can be done... if you can find a way to say to the PC, or the camera's software in the PC, "record this picture". (One way to do that would be to record pictures from the camera once per second, but always to the same file. And to make copies of the file to new files, of different nameS when the Arduino sensors are "saying" to.)
In all of the above, you could probably, as someone else said, use the simpler radio links between Arduino and base, rather than the more complex full WiFi.
For a non-Arduino discussion of using IP Cameras without going to extreme expense or complexity.... including via Internet access... see....