• The button connects (if pressed) VCC (3.3V) to Ground producing a short.

    If you want to pull a pin to ground you should always use a resistor e.g. 10k and not tie it directly,
    see: https://en.wikipedia.org/wiki/Pull-up_reĀ­sistor for details.
    Note: The article describes pull-up, but the same principle applies to pull down.


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