In this project, Jason Poel Smith shows you how to make a "Useless Candle." Its only function is to blow itself out. This is a new version of the classic "useless machine" idea. A light sensor detects when the candle is lit, and turns on an air pump, which blows out the candle.
Published 2014-12-08 · Watch on YouTube ↗ Availability and playback restrictions are controlled by the original channel.
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