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 ...

The sound of car alarms going off at the touch are common enough. How do these car protection systems detect intrusion? In a car alarm system, a siren is connected to a few sensors to ensure that as ...

Researchers will report a new laser-based sensor that effectively detects buried objects even while the detector is in motion. This new device offers a significant improvement over existing ...