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Yesterday I discovered a potentially dangerous bug in original motor controller firmware..
Something went wrong while I was cutting a metal rod and my instinctive reaction was to quickly turn the potentiometer knob to the left to stop the spindle rotating (instead of hitting the emergency button..)... but there was no expected effect - the spindle continued rotating.
Later I experimented a bit and yes - only relative slow(er) movement of pot controls the spindle, but quick change doesn't.
This is another reason to replace original processor with AtTiny..
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