Compendium of Projects Exhibited during the 2nd NLEPC - Vol I

STREET LIGHT
AUTOMATIC ON/OFF
This project is designed by following blocks :
LDR, Comparator, Relay and Lighting System
The system consists power supply unit, lighting system,
LDR, Comparator and a Relay. The LDR is a light
detecting resistor, which output voltage varies depends on
the environmental light, it is connected with comparator
for sends low voltage and input voltage, when the sun
light is dark, the LDR sends low voltage to the comparator,
so the reference voltage and LDR output voltage are not
matched with each other, then the comparator triggers a
high puls from its output pin, this is given to the relay
driver circuit for ON the street light. So the two reference
are onual its off.
610
2012
nd
2 National Level
Exhibition
& Project
Competitions
Details of the participant
Name
J. Divya
Class
IXth
Innovation in Science Pursuit for Inspired Research
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School Name & Address
Thiakesar Alai Hr. Sec. School,
Usilampatty, Manaparai Tk, Trichy
Name of the Mentor Teacher
M. Bhaskaran
Name of the District & State
Trichy, Tamil Nadu
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