Introduction: This circuit does not require any manual switching operation .In presence of light switch gets on while in case of darkness to certain level the sensor circuit gets activated and when there is another source such as sunlight the street lights get off automatically.
|Led||3 to 6 pieces|
|Variable resistor||47 k ohm|
WORKING: the basic working element of this circuit is LDR (i-e: when light falls on it it’s resistance decreases) IC possess comparator inbuilt that compares between input voltage and 1/3rd of power supply .When input falls below 1/3rd of supply voltage the output becomes high otherwise it is low since in presence of light input voltage rises but there is no positive voltage at output to drive the relay or led. Thus in darkness the output will become high that will energize the circuit.
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