Hello Friends

In this post we will see how to use LDR to make a Darkness sensor circuit.

Basically a darkness sensor circuit turn on a light in darkness and turn off light in brightness.

1) LDR—–

2) 50KOHM RESISTOR———

3) 1KOHM RESISTOR———

4) BC547 TRANSISTOR———

5) 9V BATTERY———

LDR is a photoresistor is a light-controlled variable resistor.

The resistance of a photoresistor decreases with increasing incident light intensity,

in other words, it exhibits photoconductivity.

A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.

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