A spirit level, you know the kind of level with a little bubble in a tube of fluid, is a basic construction tool. [DesignBuildDestroy] took an Arduino, a gyroscope chip, and an OLED, and made a 3D ...
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There is a well-known story of a gentleman who held that Earth was flat. He took a spirit level on a long-haul flight and afterwards announced that, other than during take-off and landing, the ...
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