Hardware fun: building an email-controlled gun for PyCon 2013

I think the next step is to add a webcam, then some computer vision code. So you could stand next to it, take a photo of a picture with your phone, attach and email it to the gun -- then it would scan around until it found the picture in the attached photo, aim and fire.

I thought this was really cool.<p>I actually think someone could make this into a sellable product for companies running trade show booths. The main goal of a trade show booth is to attract visitors and get their contact information. This system is a creative way to do both.

BTW everyone was blown away by Rasberry Pi. It's one thing to read about it online, but the hands-on experience is something else. BTW every PyCon attendee this year received a free Rasberry Pi as a "secret gift", that's cool.<p>I have my own now, and I'm in a brainstorming mode. Idea #1 so far is to hook it up to a laser and try to draw something on walls. Unfortunately I am lacking the hardware skills for that.<p>Any ideas? Something more practical for a software person to build? :-))

How does the aiming work? Do you send separate emails to move the gun?