Digital LDR Sensor Module

Overview

The Digital LDR (Light Dependent Resistor) Module is a high-sensitivity light detection sensor. It uses a photoresistor to measure ambient light levels and an LM393 voltage comparator to provide a clean, stable digital signal. Whether you are building a simple “Darkness Detector” or a complex solar tracking system, this module provides both a Digital Output (DO) for simple triggers and an Analog Output (AO) for precise light measurement.

Key Features 

• Adjustable Sensitivity: Features a multi-turn potentiometer to set the exact light level at which the digital output triggers.

• Dual Output Mode: * Digital (DO): Outputs a simple HIGH/LOW signal—perfect for triggering relays directly.

• Analog (AO): Provides a continuous voltage value based on light intensity for Arduino ADC pins.

• Clear Indicators: Onboard Power LED and Signal Output LED for easy debugging.

• Stable Signal: The LM393 chip ensures a clean output with no “jitter” or false triggers at the threshold point.

Technical Specifications