Here is a simple alarm circuit by using a vibration that comes from a thin piezoelectric sensor, which can be mounted on doors, desks, or media, that can vibrate when knocking the surface. Vibration or signal is then amplified and processed, and sound an alarm within a certain period.
Piezoelectric sensor in general is a device that serves to measure pressure, vibration, acceleration, force, or strain by transforming it into electrical signals. These
Piezoelectric Sensor
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