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Team(3):

Ganesh kumar.V(52)

Jayesh Trivedi(22)

Suresh Mandhapalli(31)

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ABSTRACT

Normally, home appliances arecontrolled by means ofswitches,sensors, etc. However,physical contact with switches may be

dangero

us if

there is any sho

rting.The circuit described here requiresno physical contact for operating theappliance. You just need to move

your hand between the infrared LED(IR LED1) and the phototransistor(T1). The infrared rays transmitted by

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Circuit diagram

T2

BC548

T1

L14F1

R1

4700

R3

3.3k

RL1

10uH 0

NO

230V,50HZ

IR LED 1

VCC

L N

N/C

U2A

IC CA 3140

1

3

2

4

11

OUT

+

-

V+

V-VR1

10k PRESET

0D1 1N4007

R2

100k

+5V

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INTRODUCTION

To

bias Wo

ng has designed the 100ft

on/offswitch. A wireless, metal-plate wall switch that can be placedanywhere and can control any light fixture in your house byattaching its by a human as a control signal to a systemdirectlymanipulated

remote component. The range on the Lucite-boxed switch isA switch may beNormally, home appliances are controlled by means ofswitchessensors, etc. However, physical contact with switches may dangerousifthere is any shorting.

The circuit described here requires no physical contact foroperating the appliance. You just need to move your hand between

the infrared LED and the photo transistor.

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COMPONENTS REQUIRED:

To prepare Wirelessswitch we need

Transistor / SCRLED

RelayResistor andCapacitor

IC CA 3140

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WORKING:transistor and other discrete components

When regulated voltage is connected tocircuit it emits IRrays, which are received by

photo transistor

Op-amp amplifies the signal received from phototransistor.

R3 controls the base current of transisitor

The high output of IC1 energise relay & leads to switch on

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ADVANTAGES

It is simple,compactand cheap.

The circuit is stable & sensitivecompared toother ACappliancecontrol circuits

Current consumption is low inmilliamperes.

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DISADVANTAGES

In order to switch on the appliance we simplyinterrupt the IR rays fallingOn the photo transistor through our hand.

During interruption the appliance remains onthrough the relay.

When we removeour hand from IR beam theappliance turns off through relay.

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APPLICATIONS

Can control any light fixture in yourhouse by attaching its remotecomponent

Comfort

Less strain

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PRECAUTIONS

T1 should be properly alligned.

Poper care should be taken

while yo

u supply the vo

ltage to

circuit

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CONCLUSION

Thus a wireless switch can be prepared

by just a small circuit which has a LEDand photo

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Thank u