robo computer

Q: has anyone ever tried to make thier computer wirelessly control a robot of some sort for a "useful" purpose. like feeding fish or letting the dog out. something they made sorta from "scratch"?
or
does anyone out there turn old computers into robots?

I'm more curious about that copper monstrosity in your avatar.

ohh.....
thats a water block for a graphics card that someone posted as a joke and i decided to make my avatar!