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Mini project

On

A SIMPLE LIGHT ACTIVATED SWITCH

ByBatch No: B13-2

G.VIJAY 09881A04A9

R.RAJESH 09881A0489

Under the guidance of

Ms .DEEPA

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AGENDA Introduction

Components used

Pin diagram Circuit diagram

Working

Applications

Conclusion

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Introduction

What is Light Activated Switch? For What Purpose do we Require it.

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COMPONENTS USEDLight Dependent Resistors

o LDRs are very useful especially in light/dark sensor circuits.

o Resistance of LDRs are very high.

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RELAY DRIVERS A device that responds to a small current or voltage

change by activating switches or other devices in an

electric circuit

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Circuit diagram

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Working

The LED switch ON when there is Absense of theLight on the Light Depending Resistor.

. When night falls the resistance of LDR increases tomake the voltage across the R2 to decrease below0.6V. This makes transistor Q1 OFF which in turnmakes Q2 ON. The relay will be energized and the

bulb will glow.

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Components used: Transistors (bc 107,sl 100)

LDR

100kpreset Resistors (1k)

relay (9v)

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Applications

Automatic Street Light

Institutes

HomeAutomatic Parking Light

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CONCLUSIONWe have presented the basic security mechanisms of

the Simple Light Activated Switch, and we havedemonstrated that our design is sufficiently flexible toaccommodate a wide variety of security-relatedmechanisms.

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QUERIES

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