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With a laser pointer, two pager motors, a mirror and a small project box you can build a simple laser projector. The output looks like the patterns that were created by the Spirograph.
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Nice hack. Figures are calles Lissajous-Figures
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The figures aren’t Lissajous figures, they’re Hypotrochoids and Epitrochoids.
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um… 15 bucks…
http://www.thinkgeek.com/geektoys/science/97ab/
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Technically they’re neither. If each of the motors only affects the angle of the beam in a single plane, and the two planes are orthogonal, and the nature of the disturbance in each case is truly sinusoidal, and the two motor speeds are constant, _then_ we’ll have a Lissajous figure. But none of these things are true.
So let’s not argue – they’re pretty pictures and it’s a fun hack! 😉
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