Say Hello, Lucky Cat

While tinkering with his lucky cat or maneki neko, Martin Fitzpatrick decided to go a bit further and play around with it a little bit more. What he produced is an amazing build of a lucky cat that displays a message with its spinning arm.

The display uses the persistence of vision effect to generate an image 'in the air'. By repeatedly outputting light at a specific point in the rotation, and with a short enough cycle time, the viewer's eye does not register any change in brightness.
Managing to generate a static image depends on hitting the exact same point on the next turn around the loop. By adding a slight over- or under-scan you can make the message display rotate.

He also explains his process of building and programming the lucky cat so that it shows the message "Hello Python".

(Image credit: Martin Fitzpatrick/Imgur)

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