Yes i have a few pi's but what you want to do is way out of the scope of this forum to teach you how,Here are a few links to get you going I guarantee you you'll be getting arduino to as together the limits are endless.
http://www.element14.com/community/groups/raspberry-pi
http://www.raspberrypi.org/phpBB3/
http://www.raspberryshake.com/
http://www.raspberrypi-spy.co.uk/
http://learn.adafruit.com/category/learn-raspberry-pi
http://www.themagpi.com/
http://uk.rs-online.com/web/generalDisplay.html?id=arduino
They are really addictive once you start your first successful projects.This is my last project and it really is a fine piece of kit:
http://pibob.nadnerb.co.uk/index.html
Lol... who would ever want sky or cable tv when you can have this all for free (except of course for the pi and Hard Drive etc.) Absolutely phenomenal for such a small cheap pi and the satisfaction knowing you actually made it and to your own customization,Damn to have something like this made up professionally by a large company would undoubtedly cost a fortune.