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Of late, the magnetic stirrer mixing my morning cocoa occasionally doesn’t start spinning when I turn it on, which calls for some investigation. Removing the four obvious screws concealed under the rubber feet and prying off bottom cover reveals the trivial innards: The speed adjustment pot holds the little circuit board in place, with the…
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The problem is that the current-versus-config-value curve has a non-monotonic discontinuity in the middle.
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The transparent top coating isn’t armor plating
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Finally, the Reset and TX pin pads simply tore loose from the circuit board.
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You should, of course, use a 3.3 V FTDI Basic board with a 3.3 V Pro, which would at least put two similar voltage sources head-to-head.
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They’re not pretty, but the driveway hasn’t complained yet.
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I eventually noticed the corrosion creeping around the edges.
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The aluminum cone eventually worries its way through the plastic post and falls into the tank, taking the heat-formed button from the post along with it.
The Smell of Molten Projects in the Morning 