So this preset can be used to adjust the sensitivity of the circuit. That reference voltage is made by using the pot or preset. Now a reference voltage is required to compare with the voltage across LDR. Voltage across the LDR is given to the positive terminal of a comparator. So voltage across LDR changes with intensity of light. The LDR is placed in a potential divider network. The resistance value changes from few 100 ohms to mega ohm range. Likewise it offers high resistance in dark. It is a sensor which is a particular kind of resistor whose resistance decreases when exposed to light. The main part of this circuit is the light dependent resistor (LDR). Components RequiredĬircuit Diagram Automatic Night Lamp – Circuit Diagram Working This project finds wide outdoor applications in streets, gardens and public places where it finds difficulty to appoint a person to operate the lights. A sensor called LDR is used to detect the light intensity. And it automatically turns ON when the surrounding is dark and it turns OFF when it receives light from surroundings. It senses the light intensity from surroundings and find whether its day or night. Automatic night lamp as the name suggests is for turning ON and OFF the lamp automatically without the need of human interventions.
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