Op Amp Contest: Generate Spirograph Shapes Using Only Op Amps and Math - If you’re a child of the ’80s or ’90s, chances are you’ve spent hours tracing out ... - https://hackaday.com/2023/06/05/op-amp-contest-generate-spirograph-shapes-using-only-op-amps-and-math/ #hypotrochoid #epitrochoid #spirograph #toyhacks #mcp6004 #opamps #art

The Hoot-Nanny (later called "Magic Designer") was a children's drawing toy that drew six-lobed patterns like the one shown below.

I've uploaded a simple CC-BY-SA simulation in Python here:
https://gist.github.com/scruss/529a8ad86ea4906cd7db999b285574d0

It generates HP-GL and is hard-coded (currently) to one pattern. It doesn't model any of the fixed circle-drawing points present in the real thing.

Have fun!

#plotter #geometry #hypotrochoid