Deterrent Light. Application Circuit 1


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Install this Deterrent Light in your Home backyard and Porch to thwart the attempt of Burglary. This PIR Motion Sensor based light switches on instantly when it detects a Human movement from a distance of ten meters. The light turns on for 3 minutes and then turns off. It Re triggers again if the movement continues. Relay is used to drive the load, so any kind of lights can be used.
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Automatic Washbasin Light. Home Utility Circuit 22


1BWhy wasting energy by continuously switching on the Washbasin light? Just install this Motion sensor based LED light. When you move towards the Washbasin, the light turns on. It stays on for three minutes and turns off. You can also use this as a Cupboard light. Its power is 6 wattsCool! No switching is needed and saves considerable amount of energy. Its cost is just Rs. 150.Let us see its working.

Designed and developed by D.Mohankumar
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PIR Light Switch.Design note 7


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PIR Based Light switches are now available to use as Motion detectors. When somebody passes through its detection area, the load such as light or electric alarm turns on. The delay time can be adjusted from 30 seconds to 3 minutes. After the delay time, the load turns off. The sensitivity can also be adjusted up to 10 meters. The unit consists of a PIR sensor module and a Tric controlled circuit for AC operation. It uses a transformerless power supply to make the unit compact. Load can be any AC device like bulb, Tubelight, CFL or an AC bell. It also has an LDR based circuit for actvating the circuit only at night. It is very easy to fix the unit and only two wires are needed for connection.It costs Rs. 350 to 550 depending on the make.
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