Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch Output (0 and 1)
Detection Component	Photoresistor (LDR)
Pin Configuration	4-Pin (VCC, GND, DO, AO)
Adjustable Sensitivity	Yes, via Potentiometer
Comparator Chip	LM393
Board Size	32mm x 14mm
Mounting Hole Diameter	3mm
Compatibility	Arduino, Raspberry Pi, STM32
Application	Light intensity detection, Smart lighting control

6 reviews

Anonymous

Mar 28, 2026

Rating: 5/5

Compact and effective

Small form factor fits perfectly into my custom enclosure. The mounting holes are standard size which made installation a breeze. Highly recommend for any light sensing application.

Anonymous

Mar 25, 2026

Rating: 5/5

Perfect for my Arduino project

This sensor module works exactly as described. The potentiometer makes it very easy to calibrate the sensitivity for different lighting conditions. I used it to build a night light that turns on automatically when the room gets dark.

Anonymous

Mar 20, 2026

Rating: 4/5

Works well with 3.3V logic

Tested this with an ESP32 running at 3.3V and it performed flawlessly. The output voltage levels are compatible. Just wish the cable was included, but that's minor.

Anonymous

Mar 15, 2026

Rating: 5/5

Exceeded expectations

Very stable readings even in fluctuating light environments. The ability to read both analog values and digital triggers gives great flexibility for coding logic.

Anonymous

Mar 14, 2026

Rating: 5/5

Reliable and sensitive

I bought ten of these for a classroom workshop. All of them worked out of the box. The response time to light changes is quick, and the LM393 comparator provides a clean digital signal.

Anonymous

Mar 09, 2026

Rating: 4/5

Good value, clear instructions needed

The hardware quality is solid and the pins are well-soldered. However, beginners might struggle without a tutorial on how to wire the analog vs digital outputs. Once figured out, it performs great.

5 FAQ

Q: Does this module provide an analog output or only digital?

A: This module provides both! You can read the varying voltage from the AO (Analog Output) pin or use the DO (Digital Output) pin for a simple high/low signal based on your threshold setting.

Q: Is this compatible with Raspberry Pi GPIO pins?

A: Yes, it is compatible. Since the Pi uses 3.3V logic, ensure you power the module with 3.3V. You can connect the DO pin directly to a GPIO input pin for digital reading.

Q: How do I adjust the sensitivity of the light detection?

A: There is a blue potentiometer on the board. Use a small screwdriver to rotate it clockwise or counter-clockwise while exposing the sensor to your target light level until the indicator LED behaves as desired.

Q: Can this sensor detect infrared light?

A: This module uses a standard photoresistor which is primarily sensitive to visible light. It is not optimized for detecting infrared (IR) signals; for IR, we recommend our dedicated IR receiver modules.

Q: What is the maximum voltage this sensor can handle?

A: The recommended operating voltage is between 3.3V and 5V DC. Please do not exceed 5V to avoid damaging the comparator chip or the photoresistor.

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