This is a discussion on Think he can make it work? within the Off Topic & Humor Discussion forums, part of the The Back Porch category; http://www.youtube.com/watch?v=Fu0OX7MQL5I...
Cool project, but i'm not sure what the device would be used for. Is the bb gun supposed to take the place of a real gun? If so.. what about recoil?
Forget all that. "Yes judge I had to shoot the BG remotely because my cat was afraid for his life".
If your not home the best thing you can point at a BG is a camera.
Don't hit at all if it is honorably possible to avoid hitting; but never hit soft!
-- Theodore Roosevelt --
I saw a video a long time ago of something similar. A guy had a P-90 airsoft gun rigged up with a camera and wrote some motion detection and tracking software that could autonomously target and fire the gun. It worked pretty well, apparently.
Such a thing really doesn't have much purpose in a private residence, but it could be useful in high security prisons and such, armed with rubber bullets.