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An LDR (Light Dependent Resistor) module, also known as a photoresistor, is a sensor that detects light intensity. Its resistance decreases as light intensity increases, making it ideal for applications like automatic lighting systems, security devices, and environmental monitoring. The module provides both digital (DO) and analog (AO) outputs, enabling versatile use with Arduino.
Connecting the LDR Module to Arduino
The LDR module has four pins:
VCC: Connect to Arduino's 5V.
GND: Connect to Arduino's GND.
DO (Digital Output): Outputs HIGH (dark) or LOW (light) based on a threshold set by the onboard potentiometer.
AO (Analog Output): Outputs a variable voltage proportional to light intensity.
Example Wiring
Connect VCC to Arduino's 5V and GND to GND.
For digital output, connect DO to a digital pin (e.g., D2).
For analog output, connect AO to an analog pin (e.g., A0).
Arduino Code Examples
Reading Digital Output (DO)
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