We have covered a bunch of cool robotic plot clocks here in the past. You don’t need to spend a fortune to build your own. Plotclock is a fun project that shows you how to build your own clock that plots time using Arduino, servos, and 3D printed parts.
More gadgets like this: here
plotclock
As you can see in the above video, this clock writes and erases time. More information is available here.
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