LDR Module


The LDR Sensor Module [Product Link] is used for detecting light.


LDR Sensor Module
LDR Sensor Module
  • Uses high quality light dependent resistor.
  • Potentiometer to adjust light brightness threshold.
  • Digital Output
  • Fixed bolt hole for convenient installation
  • Uses LM393 wide voltage comparator
  • LED indicator – ON when ambient light is more than threshold
  • Operating Voltage is 3.3-5 V
  • Dimensions: 3.2cm x 1.4cm


The module has 3 pins- Vcc, GND, DO(digital output).

This module is used to detect ambient light. If the ambient light intensity is less than the threshold value set using the potentiometer, DO outputs HIGH(1) value and when the ambient light intensity is more than the set threshold, DO outputs a LOW(0) value.

Use this module with the Laser Head Module [Product Link] to make applications that react to whenever the laser beam falling on the LDR Module is interrupted. Remember to place the LDR Sensor Module in a dark enclosure, away from other light sources that can interfere with the Laser Head’s beam.

// Code by Jasmeet Singh for http://Wiki.JMoon.co
int DO=4; //Connect DO pin to Digital Pin 4 of Arduino

void setup()

void loop()
Serial.print("DO Digital Value:");

Possible Application Areas

1. Motion Detection Security [Link] [Similar project implemented by Ganeev Singh] [Video Link – Ganeev Singh – Module from RoboRium.com]
2. Light Detecting Robot [Link]

Did you create a project using this product? Leave details/links below!


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