The 5mm LDR (Light Dependent Resistor) Sensor Module is an essential, easy-to-use component for any project that needs to react to ambient light levels. At Electrapac, we provide this compact module to help hobbyists and students build "smart" devices that can sense day from night or detect shadows.

Product Overview

This module uses a sensitive 5mm Photoresistor coupled with an LM393 Voltage Comparator chip. It is designed to be "plug-and-play," providing both a Digital Output (DO) for simple switching and an Analog Output (AO) for measuring specific light intensity. Whether you are building an automatic night light or a solar tracker, this small module provides the "eyes" your Arduino needs.

Key Features for Electrapac Customers

• Dual Output Capability: * Digital (DO): Outputs a HIGH or LOW signal based on a set threshold (perfect for turning on a relay).

  • 
    Analog (AO): Outputs a varying voltage (0V to 5V) proportional to light intensity (perfect for data logging).

• On-Board Threshold Adjustment: Use the small blue potentiometer to calibrate exactly how dark it needs to be before the digital trigger activates.

• Signal Indicator LEDs: Features a Power LED to show the module is active and a Status LED that lights up when the light threshold is reached.

• Compact & Low Power: Its small footprint makes it ideal for tight project boxes, and it can be powered directly from your Arduino's 5V pin.

• Breadboard Ready: Standard 4-pin header allows for easy connection using the jumper wires available at www.electrapac.com.

Wiring & Calibration Guide

To get started with your Electrapac sensor module:

1. VCC: Connect to 3.3V or 5V on your Arduino.

2. GND: Connect to Arduino Ground.

3. DO: Connect to a Digital Pin (e.g., D2) to detect "Light vs Dark."

4. AO: Connect to an Analog Pin (e.g., A0) to read the exact light level.

5. Calibration: Turn the potentiometer clockwise to increase sensitivity (triggers in brighter light) or counter-clockwise to decrease it (triggers only in deep darkness).

Primary Applications

• Automatic Night Lights: Turning on an LED or lamp when the room goes dark.

• Solar Trackers: Using two LDRs to help a solar panel follow the sun.

• Laser Tripwires: Detecting when a laser beam is broken for a DIY security system.

• Smart Blinds: Automatically closing window curtains when the sun gets too bright.

Why Shop at Electrapac?

We source our 5mm LDR Modules with high-stability LM393 chips to ensure you get consistent readings without "signal bounce." At www.electrapac.com, we provide the sensors that help your projects interact intelligently with the environment.