Knock Sensor

A spring vibration switch with its 10 kΩ pull-down, a 100 nF capacitor and a red flash light already fitted: SIGNAL goes HIGH for a moment each time a knock swings the spring onto its rod. A tap on a table as a button, a door that was knocked, a box that was dropped.

Output

active higha knock reads HIGH

Each pulse

a millisecondso use an interrupt

Pull-down

10kΩ on the board: use INPUT

VCC

3.3or 5 V, to match your board

Turn it over and see the three holes to wire: GND, VCC and SIGNAL. The spring switch is the clear tube at the top; a knock makes SIGNAL go HIGH for a few milliseconds.

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