Before you begin your own sentry gun project, there are a few things you should know.
1) Your backyard or other testing area will become a very dangerous place.
2) It's going to take up all your free time. This will take a lot of effort, probably a few afternoons to build it, then some more work to get it set up with your computer. And, if you are a truly inspired person, you won't want to stop tweaking and personalizing it after it is finished.
3) It isn't cheap. What do you already have lying around? Assuming you have only a gun and a computer, it could be a hundred dollars or more. See the Parts List for a complete list of parts you will need.
4) Take pictures during the build process, and when you are done! Everybody on the forum likes to see how the projects are coming along, and pictures will help inspire others as well as show off your design.
So, let's get started! First step: Arduino
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