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The motor brushes seem to be a pair of stiff wires
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One of my step bits has 1/32″ increments in that range, sooo…
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Extracting the sub-images is trivially easy with the ImageMagick convert function.
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Sooo, at one time there was a virus on that box masquerading as good ol’ Norton AV.
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That makes it a tank circuit with Q = R sqrt(C / L) = 1. Which is a pretty low Q, all things considered.
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If there’s no monitor connected, then the X server doesn’t know quite what to do.
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The Arduino analogWrite() function does all the heavy lifting to set the PWM machinery for normal use, followed by the tweakage for my purposes.
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Because we’ll get an interrupt for each click in either direction, we can’t simply look at the B input to tell which way the knob is turning.
The Smell of Molten Projects in the Morning 