automatic street light control system
TRANSCRIPT
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Automatic Street Light control using LDR
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GROUP MEMEBERSM Asif UW-13-ME-BSC-052Jawad Arshad UW-13-ME-BSC-056Ahsan Nasim UW-13-ME-BSC-092
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Circuit diagram
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COMPONENTS
IC ResistorVariable ResistorCapacitor LDR Transistor (BC548) Relay LED
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WORKINGWORKING
• The working of circuit is very much easy to understand. In this circuit, we used IC CA3140 which is basically an operational amplifier. Pins 2 and 3 of these IC are used to compare the voltage and give us the output in return i.e. it works as a potential divider in its inverting and non-inverting inputs (pins 2 and 3).
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• In this LDR and VR1 form one potential divider which is used to provide a variable voltage at the inverting input (that is 2) and the second potential divider is built around non-inverting input (pin 3) with the help of R1 and R2 which will grant half of the supply voltage to non inverting pin.
• As we know property of LDR that during the time of day resistance is low therefore voltage at the inverting input ( IE pin 2) is higher than the voltage at the non-inverting input (pin3) hence the output at the pin6 is low so the transistor goes into the cutoff state which means LED or bulb will not glow.
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• But in dimness or in night we know that resistance of LDR is high hence voltage at inverting input pin 2 of the IC CA3140 decreases than the non inverting input pin 3 as a result output pin 6 moves to high state which make transistor to conduct and the LED or bulb associated to it start simmering.
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PROTEUS IMPLEMENTATIONPROTEUS IMPLEMENTATION
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AdvantagesAdvantages
No man power required.No man power required.Simple Construction.Simple Construction.Efficient method.Efficient method. Less Consumption of electrical energy.Less Consumption of electrical energy.Less maintenance.Less maintenance.Cheap and economical.Cheap and economical.
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