This do it yourself robot can be made out of many materials you can find around your house. You'll need a few special non household items, such as an arduino and a class 3 laser. However, once you assemble everything correctly, you can make a sentry robot inspired by the robots in the game PORTAL. Even if you've never built a robot before, as long as you have a basic knowledge of electronics, you can start with this simple and fun project.
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