Here's my second arduino robot. I call it the rubberband defender. It had a 6 shot rubberband gun and can locate and fire on a target. The code is dirt simple.
Be sure to check out the video of the robot shooting some targets. It's pretty cool.
I'd be glad to answer questions.
I saw this last night, forgot to comment. Very nice implementation. I like the use of the four-arm servo fitting to pull rubberbands. What is the mechanics of turning? Lego motor or another hobby motor?
I quite like it. Seems quite effective...
I'll have to build one to guard my room