LM393 Light Sensor Module 3.3V-5V Adjustable Sensitivity DIY

LM393 Light Control Sensor Module – Adjustable Sensitivity for DIY Electronics

Take your DIY electronics projects to the next level with this compact and versatile LM393 Light Control Sensor Module. Operating across a wide voltage range of 3.3V to 5V, this module is compatible with Arduino, Raspberry Pi, and most popular microcontroller platforms. With both digital and analog output, it gives you the flexibility to detect ambient light levels and trigger automated responses in your circuits.

Key Features

• Wide Voltage Compatibility: Works reliably at 3.3V and 5V, making it suitable for a broad range of microcontrollers and development boards.
• Adjustable Sensitivity: Built-in potentiometer lets you fine-tune the light detection threshold to suit your specific environment or application.
• Dual Output: Provides both digital (DO) and analog (AO) output signals for maximum flexibility in your project design.
• LM393 Comparator IC: Utilizes the industry-standard LM393 dual comparator chip for stable, accurate light-level detection.
• Photoresistor (LDR) Based: Uses a light-dependent resistor to measure ambient light intensity with high sensitivity.
• SMD Construction: Compact SMD component layout keeps the module small and easy to integrate into tight builds.
• Status LED Indicator: Onboard LED provides instant visual feedback when the light threshold is triggered.
• Plug-and-Play Ready: 4-pin interface (VCC, GND, DO, AO) for quick and easy wiring.

Specifications

• Operating Voltage: 3.3V – 5V DC
• Output Type: Digital (DO) + Analog (AO)
• Comparator IC: LM393
• Sensor Type: Photoresistor (LDR)
• Sensitivity: Adjustable via onboard potentiometer
• Package Includes: 1 × LM393 Light Sensor Module (SMD)

Perfect For

• Arduino and Raspberry Pi light-sensing projects
• Automatic street light or lamp control circuits
• Smart home and home automation systems
• Robotics and obstacle/environment detection
• DIY electronics learning and prototyping

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Frequently Asked Questions

Q: What voltage does the LM393 Light Control Sensor Module support?

A: The LM393 Light Control Sensor Module supports a wide operating voltage range of 3.3V to 5V DC, making it compatible with Arduino (5V), Raspberry Pi (3.3V), ESP8266, ESP32, and most other popular microcontroller and development boards.

Q: What is the difference between the digital (DO) and analog (AO) outputs on this sensor module?

A: The digital output (DO) sends a HIGH or LOW signal based on whether the detected light level crosses the threshold you set with the onboard potentiometer — ideal for triggering on/off actions. The analog output (AO) provides a continuously varying voltage that corresponds to the measured light intensity, giving you more granular data for advanced applications.

Q: How do I adjust the sensitivity of the LM393 Light Sensor Module?

A: Sensitivity is adjusted using the small onboard potentiometer. Simply turn it clockwise or counterclockwise with a small screwdriver to raise or lower the light detection threshold until it responds to the ambient light level you need for your project.

Q: Is this module compatible with Arduino?

A: Yes! The LM393 Light Control Sensor Module is fully compatible with Arduino, as well as Raspberry Pi, STM32, ESP8266, ESP32, and other 3.3V/5V microcontroller platforms. Connect VCC, GND, DO, and AO to the corresponding pins on your board and you're ready to go.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.