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by:-Er. AnAnd kumAr mAuryA
ELECTRICAL & ELECTRONIC ENGINEERING
POWERPOINT PRESENTATIONON
AUTOMATIC STREET LIGHT CONTROL USING LDR
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Unnecessary use of energy.There is no use of street light in day time and man power .
INTRODUCTION
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Many of the people have a phobia of darkness so that to assist them in such situation we have explained a simple circuit . It will automatically turn on street light in the way of LEDs or BULBs coupled with relay. Working this circuit is very much easy and also the power consumed by the circuit is very low because of the few components used in circuit.
IC-LM358RELAY LIGHT DEPANDENT RESISTOR (LDR)RESISTOR (VR, FR)CAPACITORTRANSISTORLAMP
COMPONENTS REQUIRED
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CIRCUIT DIAGRAM
IC-LM358
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o The LM358 has consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages.
o Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage.
o The LM358 and LM2904 are available in a chip sized package using National’s micro SMD package technology.
IC-LM358
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RELAY
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o Relay is an electrically operated switch .
o Current flowing through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts.
o It has 3-pin, 4-pin, 5-pin etc.….. But we have use 5-pin in our circuit diagram.
LIGHT DEPANDENT RESISTOR (LDR)
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o Sensitivity depends on intensity of light.
o Resistance of LDR decrease with increase in intensity of light and vive-versa
RELAY
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o As no input state the COM is connected to NC and when operating V is applied to relay coil get energized and COM is now with NO
RESISTOR
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o It is a passive component having two terminals that are used to mange the current flow in the circuit.
o A current that flows via a resistor is directly proportional to the voltage that appeared into resistor
o Two types:
(1) Fixed value resistor
(2) Variable resistor
Fixed type Variable type
RESISTOR
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CAPACITOR
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o A capacitor (originally known as a condenser) is a passive two terminal electrical component used to store electrical energy temporarily in an electric field.
o The forms of practical capacitors vary widely, but all contain at least two electrical conductors separated by a dielectric
o The conductors can be thin films ,foils or sintered beads of metal or conductive electrolyte, etc.
o The nonconducting dielectric acts to increase the capacitor's charge capacity. A dielectric can be glass, ceramic, plastic film, air, vacuum, paper, mica, oxid layer etc.
CAPACITOR
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Types of capacitor
Symbols
BC547 TRANSISTOR
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o It is a general purpose silicon, NPN bipolar junction transistor. It is used for amplification and switch purpose
o Here, for switching purpose biased so that it remains on if there is signal at its base other wise completely off
LAMP
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o The lamp is used as the load for the output.o In place of lamp LEDs and BULBs are used.
OUR PROGRESS
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1. Simulation using proteus:-
OUR PROGRESS
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2.Circuit design on bread board:-
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