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Application

Lighting Control: Used in home lighting
systems to adjust brightness according to user
preference or time of day.

Using Light Sensor (LDR) to Control Circuits

A light sensor is a device that detects the
amount of light in its surroundings. It

helps devices understand how bright or
dark it is and react accordingly.

Working

1. Detecting Light: The light sensor senses the brightness of the light around
it. It measures how much light is hitting the sensor and sends a signal based
on the amount of light.

2. Converting Light to Electrical Signal: The light sensor changes the

brightness it detects into an electrical signal. This signal can be used to
control other parts of a circuit.

3. Response to Light: When there is a lot of light, the sensor can trigger a
reaction, like turning off a nightlight during the day. If it’s dark, it might

turn the light on.

Application

Street Lights: Some street lights have light
sensors. When it gets dark outside, the sensor

detects the low light and automatically turns
on the street lights. When the sun comes up,
the sensor detects brightness and turns the

lights off.

Introduction to Electronics and Circuits 47