Light Sensor Circuit. It can be employed to compare the light levels in an area. Same as the dark sensor we could modify light sensor to be more modular by switching the r1 resistor with variable resistor thus.
Yet again this circuit works the same as the dark sensor. The circuit is a light sensor circuit. In this tutorial we ll learn how to make a light sensor circuit using ldr light dependent resistor 555 timer ic and a few other electronics components.
In the light sensor circuit first diagram when the brightness of light increases the ldr s resistance reduces and so the voltage at the base of transistor increases because if ldr resistance reduces the voltage drop gap across the ldr towards positive side decreases.
It can be employed to compare the light levels in an area. Firstly connect ldr on breadboard then connect the base of bc547 to one pin of ldr. It uses a p n junction photodiode as the light sensor and ic ca3140 as a voltage comparator. This circuit can compare the light level in an area.
