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Wireless Security System Using PIR Sensors
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...
Window Charger
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 and PIR Sensors: A Small Investment For Big Savings
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...
Night Alert System
Idea of this night alert system came to me one midnight when my pet dog started barking continuously on sensing a moving shadow, perhaps...
Remote Operated Switch
Generally, a bedside master switch is used to switch on lamps both indoors and outdoors when there is a threat of intruder. This remote...
Wire Break Alarm With Delay
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.
Security System Switcher
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.
Multidoor Opening Alarm with Indicator
This door opening alarm alerts you of intruders. You can use it for up to three doors. You simply need to fit a small...
Mock Alarm with Call Bell
Here is a fully automatic mock alarm to ward off any intruder to your house. The alarm becomes active at sunset and remains ‘on’...
8 Digit Code Lock for Appliance Switching
This 8 digit code lock is useful for appliances requiring exclusive or authorised use by those who know the preset code. If desired, the...