No, I didn't mean that Arduino can take control of my system, I rather say that, it would help me in controlling my system.
So, lets take a look at my ideas.
Firstly, I thought of controlling my system from a remote distance. You may think that I am a lazy fellow, liking to sit in the couch and watch movies. Probably not, I wanted to do this, because of my ability to do this. That's it. It is just an experiment. Not of any certain motive. But, I am sure many of you would be in damn need of this. So, check out my post here for the detailed instruction. <LINK>
Second thing was to adjust my Screen Brightness. Yeah, I am guy who would sit in front of the system for hours. And hence, I wanted to do some help for my eyes. So, with some common sense about the surrounding, I decided to analyse the level of luminosity with an LDR ( I will explain later ) and change my brightness according to it. Saying simply, that my screen will be bright when it is dark, and dim when it is bright, or even the other way. It is upto your wish. And here is the link for that too. <LINK>