Time to dust off my old Etch-A-Sketch
via Steve_a on instructables
If you’re like me, you’ve tried to make a drawing on an Etch-A-Sketch before with very limited success. It’s just too hard to draw anything that isn’t made out of only rectangles! So, my son’s Etch-A-Sketch languished unused around the house for several years. Then, after building a harmonograph table (similar to this one), I noticed the Etch-A-Sketch lying around and thought “I could put motors on the Etch-A-Sketch and make it draw two pendulum harmonograph figures.” After much trial and error, it actually worked fairly well. From there, I decided to make it replicate more complex rotary harmonograph figures and, finally, draw images.
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