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The motor brushes seem to be a pair of stiff wires
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Combining those two filters cuts the overall bandwidth down to 120-ish Hz
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The analog output voltage never goes below 0.4 V,
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It will sample every other pixel in each row
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A bead of Elmer’s yellow wood glue holds the finger joints together
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The sine wave pattern comes from a totally cargo-culted Imagemagic invocation
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Engraving the pattern at 100 mm/s makes each bar 10 ms wide
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The L-AN terminal produces an equivalent analog signal
The Smell of Molten Projects in the Morning 