Making Light Sensor with the help of Wheatstone Bridge

The wheatstone bridge is the circuit introduced early for the purpose of measuring an unknown resistance. The resistance is measured by finding the balance point when there is no flow of current in between the two edges.

How Light Sensor works 

The same circuit can be used to measure the light. In the application one of the edges consist of two known resistance and other edge consist of a Light dependent Resistor and a variable resistor. The Photoresistance does have certain certain value at a certain intensity of light which means at a certain amount of light the null condition is found.

Light Dependent Resistor