Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch Output (TTL)
Detection Range	Adjustable via Potentiometer
Comparator Chip	LM393
Pin Count	4 Pins (VCC, GND, DO, AO)
PCB Size	32mm x 14mm
Mounting Hole Diameter	3mm
Response Time	< 1ms
Compatibility	Arduino, Raspberry Pi, ESP32
Package Includes	1x Sensor Module, 1x Header Pin Set

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Great addition to my sensor kit

Fast shipping and the product arrived well-packaged. Tested it immediately with a simple sketch, and it detected shadow and light instantly. Will definitely buy more if needed.

Anonymous

Mar 24, 2026

Rating: 4/5

Good quality, clear instructions needed

The hardware is solid and responds quickly to light changes. I wish it came with a printed pinout diagram, but I found the info online easily. Works great for my automatic night light build.

Anonymous

Mar 20, 2026

Rating: 4/5

Solid component for the price

Does exactly what it says. The LM393 comparator is reliable. Only minor issue is the header pins weren't pre-soldered, but that's standard for these modules. Highly recommended.

Anonymous

Mar 12, 2026

Rating: 5/5

Easy to use for beginners

As someone new to electronics, I found this module very forgiving. Connecting it was straightforward, and the onboard LED indicator helps visualize when the threshold is triggered.

Anonymous

Mar 04, 2026

Rating: 5/5

Perfect for my Arduino project

This sensor module works flawlessly with my Arduino Uno. The sensitivity adjustment potentiometer makes it very easy to calibrate for different lighting conditions. Great value for the price.

Anonymous

Mar 01, 2026

Rating: 5/5

Reliable and sensitive

I bought five of these for a robotics project. All of them performed consistently. The digital output is clean, and the analog output provides good granularity for reading light levels.

5 FAQ

Q: What is the maximum current this module draws?

A: Under normal operating conditions with the indicator LED on, the module typically draws around 10-15mA. If you need to save power, the indicator LED can be disabled by removing its resistor.

Q: How do I adjust the sensitivity of the sensor?

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

Q: Does this module provide both analog and digital output?

A: Yes, this 4-pin module provides both a Digital Output (DO) which acts as a switch based on your threshold setting, and an Analog Output (AO) which gives a variable voltage corresponding to light intensity.

Q: Is the photoresistor replaceable if it gets damaged?

A: The photoresistor is soldered onto the PCB. While it is technically possible to desolder and replace it with a standard GL5528 type, it requires soldering skills. We recommend handling with care to avoid damage.

Q: Can I connect this directly to a 3.3V microcontroller like ESP8266?

A: Absolutely. The module operates within a 3.3V to 5V range, making it fully compatible with 3.3V logic systems like the ESP8266, ESP32, and Raspberry Pi GPIO pins.

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