Description
LDR Sensor (Light Dependent Resistor) – Description
An LDR sensor, also known as a photoresistor, is an electronic component whose resistance varies with the amount of light falling on its surface.
When the surrounding light is bright, the LDR’s resistance becomes low. When it is dark, the resistance becomes high.
This behavior makes the LDR a popular choice for light-sensing applications.
How It Works
The LDR is usually connected in a voltage divider circuit with a fixed resistor. As the light level changes, the voltage at the divider output changes.
A microcontroller (like Arduino) or a comparator circuit can read this changing voltage to decide actions such as turning an LED ON at night.
Common Uses
- Automatic street light / night lamp
- Light-based alarms and security systems
- Smart home lighting control
- Brightness control for displays and devices
- Solar garden light projects
Key Features
- Low cost and easy to use
- Detects changes in light intensity
- Works well for basic day/night sensing
- Compatible with Arduino, ESP8266/ESP32, and other controllers
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