Photoresistor Light Sensor Module – LM393

The Photoresistor Light Sensor Module is designed to detect ambient light intensity for embedded and control applications. It uses a photosensitive resistor combined with an LM393 comparator to provide stable and reliable signal output. The module supports both analog voltage output and digital switching output, allowing flexible integration with microcontrollers and relay modules. An onboard adjustable potentiometer enables precise sensitivity tuning based on light conditions. This module is suitable for automation systems, light-triggered control circuits, and educational electronics projects.

Features

- Photosensitive resistor for ambient light detection

- LM393 comparator for stable signal processing

- Analog voltage output for light intensity measurement

- Digital switching output for threshold-based control

- Adjustable sensitivity via onboard potentiometer

- Clean comparator output waveform

- Output drive capability above 15 mA

- Operating voltage range from 3.3 V to 5 V

Mounting holes for secure installation

Compatible with microcontrollers and relay modules

Specifications

- Operating Voltage: 3.3–5 V DC

- Sensor Type: Photoresistor (LDR)

- Comparator IC: LM393

Analog Output: Variable voltage proportional to light level

- Digital Output: Logic-level switching output (0 / 1)

- Output Drive Current: >15 mA

- Sensitivity Adjustment: Onboard potentiometer

- Mounting: Fixed bolt holes

- Application Type: Ambient light detection and control

- Board Type: Light sensor module

Links

- LM393 Comparator Datasheet

LDR - Light dependent resistor

- LDR Datasheet

Tutorials

How to use LDR Sensor with Arduino | Make Automatic street light ?