Piezo Vibration Sensors - Piezo sounder elements are often used to sense shock and vibration. HOME

Reverse engineered circuit diagram of the vibration sensing circuit out of a toy dog that barks when he senses a thump nearby:

Circuit Diagram aka Schematic reverse engineered from circuit board

Here is a picture of the piezo vibration sensor element. It is in fact a piezo sounder element:

Supplementary Illustration or Photograph or other Graphic

I do not gaurantee the accuracy or safety of any information herein.
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Do not experiment with or build any of the above circuits.