LM393 Photosensitive LDR Light Sensor Module for Arduino

The LM393 Photosensitive LDR Sensor Module is a high-precision light detection board designed for Arduino, Raspberry Pi, and other microcontroller projects. Built around the stable LM393 voltage comparator chip, this module uses a sensitive Light Dependent Resistor (LDR) to detect ambient light intensity and convert it into readable digital and analog signals.

Dual Output Modes for Maximum Versatility

This module distinguishes itself with two distinct output interfaces, making it compatible with a wide range of applications:

• Digital Output (DO): Outputs a simple High/Low logic signal (TTL). When external light intensity exceeds the set threshold, the output switches state. This is ideal for “trigger” applications like automatic street lights, burglar alarms, or counters.

• Analog Output (AO): Provides a continuous voltage signal (0-5V) proportional to the light intensity. By connecting this to an ADC pin on your microcontroller, you can measure exact brightness levels for precision monitoring.

Precision Control

The board features an onboard blue precision potentiometer (trim pot). This allows you to fine-tune the sensitivity threshold, letting you decide exactly how dark or bright the environment needs to be before the sensor triggers.

Robust & Easy to Use

• LM393 Comparator: Ensures clean, stable signal output (greater than 15mA driving capability) to drive relays or LEDs directly.

• Status Indicators: Includes a Power LED (Red) and a Digital Output Status LED (Green) for easy debugging.

• Universal Voltage: Operates smoothly between 3.3V and 5V, making it plug-and-play with almost all modern development boards.

Key Features

• High Sensitivity: Rapidly detects changes in ambient brightness.

• Smart Outputs: Simultaneous Digital (DO) and Analog (AO) output capability.

• Adjustable Trigger: Onboard potentiometer for sensitivity calibration.

• Easy Mounting: Features a fixed bolt hole for secure installation in robot chassis or enclosures.

• Wide Compatibility: Works seamlessly with Arduino, ESP32, Raspberry Pi, and STM32.

Technical Specifications

Typical Application Scenarios

• Smart Home: Automatic curtains or day/night lamps.

• Automotive: Automatic headlight activation systems.

• Robotics: Light-seeking robots or line followers (using light contrast).

• Security: Laser tripwires and light-sensitive intrusion detection.

• Agriculture: Sunlight monitoring for smart greenhouses.

4. Package Includes

• 1 x LM393 Photosensitive LDR Light Sensor Module

Important Product Disclaimer

Please note that the product information provided on our website may not be entirely accurate as it is collected from various sources on the web. While we strive to provide the most up-to-date information possible, we cannot guarantee its accuracy. We recommend that you always read the product labels, warnings, and directions before using any product. Product images are shown for illustrative purposes only and may differ from the actual product.

Note

Calibration Tip: If the output LED is always ON or always OFF, use a small screwdriver to gently turn the blue potentiometer knob until the LED responds to changes in light (e.g., covering the sensor with your hand).