piyushkul1:
Its an sensor which gives analog values. I haven't decided on the web server yet. I want the arduino to send the value of the sensor via WiFi and store it in the server online. What's the best way to achieve this? Php,mysql?
You would need to get the input signal into the 0 .. 5V range for the Arduino to be able to read it with an analog input pin.
You need to decide when to read and save the input signal. Perhaps you want to do it at regular intervals, or when it changes by some amount.
You need to decide whether there are any security requirements. If not, it would be very simple to write a sketch that acted as a web client and carried out an HTTP POST request to submit the data to a webapp that saved it to a local database.