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El ectro n ic eye or magic eye has much use i n thisEl ectro n ic eye or magic eye has much use i n this
electro n ic age. A lso k n ow n as magic eye. I t ca n beelectro n ic age. A lso k n ow n as magic eye. I t ca n beused as a n automatic guest i n dicator at the door, if used as a n automatic guest i n dicator at the door, if fixed at the bottom of the door e n tra n ce. O n ce it isfixed at the bottom of the door e n tra n ce. O n ce it isin sta ll ed at the door there is n o n eed to i n sta ll a ca ll in sta ll ed at the door there is n o n eed to i n sta ll a ca ll
be ll . I t ca n a lso be used at homes or i n ba n ks as abe ll . I t ca n a lso be used at homes or i n ba n ks as aburg lar a larm.burg lar a larm.
principle of working mainly depends on theprinciple of working mainly depends on theLDR LDR
LDR is a device which has a resistance whichLDR is a device which has a resistance which varies according to the amount of light falling varies according to the amount of light falling on its surfaceon its surface
If The intensity of light is more the resistanceIf The intensity of light is more the resistanceof the LDR is lessof the LDR is lessIf The intensity of light is less the resistance of If The intensity of light is less the resistance of
the LDR is morethe LDR is more The heart of the circuit is timer IC555. The heart of the circuit is timer IC555. which is here acting as oscillator to generate which is here acting as oscillator to generatesound whenever shadow is cast on LDR .sound whenever shadow is cast on LDR . Timer 555 is connected to operate in Timer 555 is connected to operate in astableastablemode of operation . Resistors R1, R2 along withmode of operation . Resistors R1, R2 along withcapacitor C2 & C3 are required to operate thecapacitor C2 & C3 are required to operate the
It can be used as an automatic guest indicator at theIt can be used as an automatic guest indicator at thedoor.door.
It can also be used in banks as a burglar alarm.It can also be used in banks as a burglar alarm.
Electronic Eye is a vital component in anyElectronic Eye is a vital component in anyelectric circuit which is to be turned on and off electric circuit which is to be turned on and off -- for example, solar powered garden lights,for example, solar powered garden lights,and night security lighting.and night security lighting.
An Electronic Eye can even be used in a simpleAn Electronic Eye can even be used in a simpleremote control circuit using the backlight of aremote control circuit using the backlight of amobile phone to turn on a devicemobile phone to turn on a device
Once it is installed at the door there is no need toOnce it is installed at the door there is no need toinstall a call bell.install a call bell.
Only 5V DC power supply is required for operatingOnly 5V DC power supply is required for operatingthe circuit.the circuit.