So I have allways been fascinated by smart homes and smart buildings. The main problem with most of the commercial systems is that they are waaay to expensive for a student. So I started looking toward Room automation. And after a few years of doing nothing and doing something :) this is the result. RoliHome smart room controler. Equiped with many features built using arduino, processing and Java. It can be constructed for less than a 100EUR and still has some great features. One of the main features is a presence detection. While most systems like this use moton sensors to turn the lights on/off, I use IR door sensors that actually count the number of people inside the room. That way the light wont turn off while you are sitting in front of a computer watching some videos ]:) . You can find more information on my website/blog: http://r00li.com/index.php/rolihome where you can download thi whole thing and build your own system.
Here are some pictures: The main system in a box that looks quite nice. Control application Web control And the presence sensors on the door mounted for testing.
I would realy like some comments and/or questions.