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

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.