Listening Lock Box

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A box with no discernible features or method of opening.  But… tapping the right pattern on the outside of the box causes the top to magically pop up.  On the inside a microcontroller monitors input to a microphone and looks for a particular pattern.  When that pattern is detected an internal motor is activated and pushes the top up.

This is one of the few creations that came out of my casual obsession with puzzle boxes.

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