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LDR Light Sensor Module 3 Pins With Adjustable Digital Out

The LDR Light Sensor Module is a compact and reliable solution for detecting changes in ambient light intensity. It uses a Light Dependent Resistor (LDR) to monitor light levels and provides a digital HIGH/LOW output depending on the detected brightness. An onboard potentiometer allows easy adjustment of the sensitivity threshold, so you can define the exact light level at which the output switches. This module is ideal for automatic lighting systems, robotics, and DIY electronics projects that require light-based triggering.

Package Includes

  • 1 × LDR Light Sensor Module with Potentiometer


12.60 AED 12.60 AED (Tax included)

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Features

  • Light Detection: Detects changes in surrounding light intensity.
  • Adjustable Sensitivity: Onboard potentiometer for threshold tuning.
  • Digital Output (D0): Outputs HIGH or LOW signal based on light level.
  • Simple 3-Pin Interface: Easy connection to microcontrollers.
  • Wide Compatibility: Works with Arduino, ESP8266, ESP32, and other MCUs.

Specifications

  • Sensor Type: Light Dependent Resistor (LDR)
  • Output Type: Digital (D0 only)
  • Sensitivity Adjustment: Onboard potentiometer
  • Operating Voltage: 3.3V – 5V DC
  • Pin Configuration:
    • VCC – Power Supply
    • GND – Ground
    • D0 – Digital Output
  • Dimensions: Approx. 3cm × 1.5cm × 1.3cm
  • Weight: Approx. 3g

Working Principle

The LDR changes its resistance depending on the amount of light it receives. In bright conditions, resistance decreases; in low light, resistance increases. The onboard comparator converts this change into a digital signal (HIGH or LOW), which can be read by a microcontroller.

Pinout

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Pin Description
VCC Power Supply (3.3V–5V)
GND Ground
D0 Digital Output Signal

Applications

  • Automatic street or room lighting
  • Day/Night detection systems
  • Light-triggered alarms
  • Smart home automation
  • Robotics and DIY projects

Example Arduino Connection

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  • VCC → 5V
  • GND → GND
  • D0 → Digital Pin 2

Example Arduino Code

#define LDRpin 2

void setup() {
  pinMode(LDRpin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int lightState = digitalRead(LDRpin);

  if(lightState == HIGH){
    Serial.println("Low Light Detected");
  } else {
    Serial.println("Bright Light Detected");
  }

  delay(500);
}

Library

No external library is required. The module works using the standard digitalRead() function.