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Nice job! Make sure your code doesn't start overwriting previous images in the case of a restart! Too many ways to do that easily, so I'll leave the solution up to you.
You wrote: "I don't know if polarity actually matters here..."It does. LEDs are, after all, Diodes. Hooking them up to 4.5V backwards (for a while) probably won't hurt them, but they won't light up.I'm not surprised these cheap lights, of which I have many and love, don't have modulator circuits to make them more efficient and brighter without affecting life. Perhaps an idea for another mod! ;~}
This is a great project to share with your kids!When I first saw your design, I imagined Cam plates that would be keyed to the Knobs with a Pentagon or Hex pattern so each Cam could simply be repositioned to one of 5 or 6 well defined positions and secured back to the Knob with a pan-head wood screw and washer.
Instructables should have a "LIKE" button! I totally got your "water" joke!
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