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Scientists all over the world are developing intelligent robots that can observe and learn from experience and human behaviour. The robots can then collaborate...

This project demonstrates a wireless security system in which four pyroelectric infrared (PIR) motion sensors are placed in four sides—front, back, left and right—of...

Keep away intruders with this compact electrified window charger. The charger produces non-lethal shocks that are strong enough to threaten intruders. Window Charger Circuit The circuit...

Microwave sensors offer great advantages in security and energy savings with their high sensitivity Microwave sensors are cost-effective solutions to save energy expenses and secure...

Idea of this night alert system came to me one midnight when my pet dog started barking continuously on sensing a moving shadow, perhaps...

Generally, a bedside master switch is used to switch on lamps both indoors and outdoors when there is a threat of intruder. This remote...

Here is a simple circuit of wire-break alarm that activates after a delay of 15 to 30 seconds. When the thin-wire loop running across the entrance door is broken, the alarm sounds after a delay of 15 to 30 seconds, the time period set through VR1.

This is a circuit for a security system that can detect movement of any intruder through a transducer and activate any security device through a relay.

This door opening alarm alerts you of intruders. You can use it for up to three doors. You simply need to fit a small...

Here is a fully automatic mock alarm to ward off any intruder to your house. The alarm becomes active at sunset and remains ‘on’...