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Spirograph, made of 3 stepper motors and a ballpoint pen. The speed of at least 2 motors should be different. The pattern depends on the difference in speeds. To manage used ATtiny2313A microcontroller. Stepping motors provide rotation at a constant speed

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<p>This is cool! Can you tell us more about the programming and electronics that went into making it?</p>

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More by foo52ru:creation of a walking robot using polycaprolactone spirograph 
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