While learning about different types of vibration sensors for condition monitoring, I came across a cheap piezoelectric shock/tap/vibration sensor switch module hiding in a corner of my messy ...

In need of a vibration sensor? In need of a vibration sensor? Don’t want the complexity of an accelerometer? How about a miniature implementation of an old-fashioned rattling-bits-of-metal switch.

The idea behind this compact and economical Vibration Sensor Alarm is very simple. It uses a cheap and cheerful vibration sensor to drive a piezo-sounder. As can be seen in the circuit diagram, it is ...