>    Bouncing at bottom contact will produce 0 - 0.5 Vdd noise.
>    Bouncing at top contact will produce 0.5 - 1 Vdd noise.

Exsqueeze me ?

Noise coming from the switch will be 0-5V regardless. It
must be as a consequence of the contacts touching or
otherwise the switch wouldn't be a switch, unless it came
from the Pisspoor Switch Co catalogue

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