Optical Sensitive/Photosensitive Sensor Module LM393

The LM393 Photosensitive Sensor Module is a light-detection module using a high-sensitivity photoresistor and LM393 comparator to provide both analog and digital outputs. Ideal for Arduino light-based automation, smart lighting, and IoT applications.

Optical Sensitive / Photosensitive Sensor Module LM393

The Optical Sensitive / Photosensitive Sensor Module LM393 is a highly reliable light-detection module designed to sense ambient light intensity accurately. Powered by the LM393 voltage comparator, this sensor provides stable digital (DO) and analog (AO) outputs, making it perfect for a wide range of Arduino, NodeMCU, ESP32, and Raspberry Pi projects.

This module uses a high-quality LDR photoresistor that adjusts its resistance according to light levels, allowing the user to build automatic lighting systems, light alarms, smart IoT devices, robotics, and more. The onboard potentiometer lets you precisely adjust sensitivity depending on project requirements.

Explore our full range of components:
🔗 Electronics Components — https://electroway.org/product-category/electronics-components/

Compatible microcontrollers available here:
🔗 Arduino and Accessories — https://electroway.org/product-category/arduino-and-accessories/
🔗 NodeMCU Modules — https://electroway.org/product-category/iot-and-smart-solutions/iot-modules/nodemcu/
🔗 Raspberry Pi Accessories — https://electroway.org/product-category/electronic-accessories/mounts-and-cases/raspberry-pi-mounts-and-cases/

⭐ Technical Specifications

Feature	Details
IC Chip	LM393 Comparator
Sensor Type	LDR Photoresistor
Operating Voltage	3.3V – 5V
Output	Analog Output (AO), Digital Output (DO)
Sensitivity	Adjustable (Onboard Potentiometer)
Indicator LEDs	Power LED, Digital Output LED
Working Mode	Light-detection & trigger mode
Response Time	Fast response to light changes

The digital output can easily trigger relays, alarms, and automation circuits.

⭐ Applications

💡 Smart Home & Automation

Automatic street lights
Smart indoor lighting
Light-activated alarms

🤖 Robotics & Electronics Projects

Line-following robots
Light-tracking systems
Ambient light detection

📡 IoT & Arduino Projects

Light logging
IoT-based environment monitoring
Smart appliances with light triggers

Check related categories:
🔧 Tools and Accessories — https://electroway.org/product-category/tools-and-accessories/
📦 IC’s — https://electroway.org/product-category/ics/

⭐ Precautions

⚠ Avoid exposing the LDR to direct high-intensity light for long periods.
⚠ Use a stable Power Supply to avoid false triggering.
⚠ Keep the sensor clean for accurate readings.
⚠ Do not bend or force the PCB to prevent damage.

Power supplies here:
🔗 Power Supply — https://electroway.org/product-category/raspberry-pi-and-accessories/accessories-raspberry-pi-and-accessories/power-supplies-accessories-raspberry-pi-and-accessories/

⭐ YouTube Tutorial (LM393 Photosensitive Sensor with Arduino)

📺 Watch Video:https://www.youtube.com/shorts/TUDLuGChLuU

📌 Product Summary

The LM393 Photosensitive Sensor Module is a lightweight, affordable, and precise light-detection module ideal for Arduino automation, smart home lighting, robotics, and IoT development. With analog and digital outputs plus adjustable sensitivity, it fits perfectly in beginner and advanced electronics projects.