2-Pack LM393 Photosensitive Sensor Module – Light Detection
2-Pack LM393 Photosensitive Sensor Module – Light Detection
2-Pack LM393 Photosensitive Sensor Module – 4-Pin Light Detection
Get reliable, accurate light detection with this 2-Pack LM393 Photosensitive Sensor Module. Built around the popular LM393 comparator IC, each module combines a photosensitive resistor (LDR) with a photosensitive diode to deliver both analog and digital output signals — making it a versatile choice for Arduino, Raspberry Pi, robotics, and a wide range of DIY electronics projects.
Key Features
- Dual Output: Provides both analog (AO) and digital (DO) signal outputs for maximum flexibility in your circuits.
- LM393 Comparator IC: Ensures stable, consistent threshold-based switching for light/dark detection.
- 4-Pin Interface: Simple VCC, GND, DO, and AO connections for fast, hassle-free wiring.
- Adjustable Sensitivity: On-board potentiometer lets you fine-tune the light threshold to match your environment.
- Indicator LEDs: Power and output status LEDs for easy visual feedback during testing and operation.
- Compact & Lightweight: Low-profile PCB design fits easily into enclosures, breadboards, and custom builds.
- Wide Compatibility: Works seamlessly with Arduino, ESP8266/ESP32, Raspberry Pi, and most 3.3V–5V microcontrollers.
- 2 Modules Included: Great value pack — one for your project, one as a spare or for a second application.
Specifications
- Chip: LM393 Dual Voltage Comparator
- Sensor Type: Optical / Photosensitive (LDR + Photodiode)
- Output: Analog Sensor Signal (AO) + Digital Switching (DO)
- Pins: 4-pin (VCC, GND, DO, AO)
- Material: Polymer PCB
- Operating Voltage: 3.3V – 5V DC
- Quantity: 2 Modules
- Country of Origin: Made in China
Common Applications
- Automatic street light / smart lighting control circuits
- Line-following and obstacle-avoiding robots
- Day/night switch automation
- Arduino & Raspberry Pi DIY sensor projects
- Security and ambient light monitoring systems
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Frequently Asked Questions
Q: What voltage does the LM393 photosensitive sensor module require?
A: The LM393 photosensitive sensor module operates on 3.3V to 5V DC, making it fully compatible with Arduino (5V) and Raspberry Pi / ESP8266 / ESP32 (3.3V) systems without the need for a level shifter.
Q: What is the difference between the analog (AO) and digital (DO) outputs on this sensor module?
A: The analog output (AO) provides a variable voltage proportional to the detected light intensity, allowing your microcontroller to measure exact light levels. The digital output (DO) switches between HIGH and LOW based on a threshold set by the on-board potentiometer, useful for simple light/dark trigger events.
Q: Can I adjust the sensitivity of the LM393 light detection module?
A: Yes. Each module features a small on-board potentiometer (trim pot) that you can turn with a screwdriver to set the exact light-level threshold at which the digital output switches, giving you full control over the module's sensitivity for your specific application.