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This one failed just slightly beyond the duration of its one-year warranty
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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.
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Bottom line: when you use fixed-point arithmetic, make sure you check the low end for underflow and the high end for overflow.
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Even if you RTFM, apply painstaking logic, and wire very carefully, there’s a 50% chance that the knob will turn the wrong way.
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A dab of PTFE lubricant on the latch and strike plate makes the storm door close exceedingly smoothly
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Yeah, OK, it’s a Slide Rule Gloat…
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Somewhat to my surprise, the dimension specs for alkaline and rechargeable cells aren’t quite the same.
The Smell of Molten Projects in the Morning 