This is a light sensor circuit which will detect light and switch on the relay. This light switch circuit is very simple and using only few components. Working of the circuit is simple, when the photoresistor receives light it will switch on the transistor 2N2222, when transistor become ON it
will activate the relay switch and any equipment connected with the relay will become activated. Use 5-6 volt relay. The sensitivity of the circuit can be adjusted with 50K variable resistor.
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