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15 Dangerously Mad Projects for the Evil Genius by Simon Monk

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CHAPTER 13Levitation Machine

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WHEN PLANNING CAMPAIGNS for world domination, the Evil Genius likes to have his globe of the Earth float in the air above his desk, suspended by invisible anti-gravity forces (Figure 13-1).

Actually it’s a ping-pong ball painted to look like a globe, and it’s suspended using something called electromagnetic levitation. Keeping the globe in place requires careful control of the current to the electromagnet, so this project uses an Arduino interface board that is programmed from your Mac, PC, or Linux computer.

The Arduino is a great platform for this kind of situation, and the Evil Genius has used this as the basis ...

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