A "useless machine" is one in which you turn it on, and all it does is turn itself off. They can be pretty funny, and the early internet was full of videos about them. We've posted them here before, both plain and fancy, and even political. This one is a bit more dramatic than the simple box that turns itself off. In fact, it has its own personality!
YouTuber fritend1 shares pictures of the inner workings, and the Arduino code that makes it work. -via Fark
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