....I've sometimes used a schmitt-trigger-like
software implementation: sample the input (or result of debounce
routine) a number
of times and keep a rolling tally of the number of 1's read. If 1's
count > 80% then
read as 1, less than 20% then read as 0...

That's brilliant,  Brent.  Thanks for sharing.  My approach to problematic

internal pull-ups is 10K resistors -  So much easier when the objective is

<not> 10K unit production runs...  :)

Thanks again.
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