Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	DC 3.3V - 5V
Output Type	Digital Switch (DO) & Analog (AO)
Detection Component	LDR Photoresistor
Comparator Chip	LM393
Sensitivity Adjustment	Potentiometer Included
Pin Configuration	4-Pin (VCC, GND, DO, AO)
PCB Dimensions	32mm x 14mm
Mounting Holes	3.0mm Diameter
Indicator LED	Power and Output Status
Application Compatibility	Arduino, Raspberry Pi, ESP32

6 reviews

Anonymous

Mar 25, 2026

Rating: 5/5

Perfect for my automatic night light project

This sensor module works exactly as described. The potentiometer makes it very easy to calibrate the sensitivity threshold. I connected it to an Arduino Uno and had it reading light levels within minutes. Great value for the price.

Anonymous

Mar 21, 2026

Rating: 5/5

Reliable and responsive

I bought five of these for a robotics project. All five units performed consistently with no dead-on-arrival issues. The response time to light changes is quick enough for most hobby applications. Highly recommended.

Anonymous

Mar 09, 2026

Rating: 4/5

Good quality, clear instructions needed

The hardware quality is solid and the soldering points are clean. However, beginners might struggle slightly without a pinout diagram included in the package. Once I found a guide online, it worked flawlessly for my garden lighting system.

Anonymous

Mar 07, 2026

Rating: 5/5

Great for greenhouse monitoring

Using this to monitor sunlight exposure in my smart greenhouse setup. It handles the humidity well inside the protective case I built. The voltage range is flexible enough to run off my 3.3V ESP8266 board directly.

Anonymous

Mar 04, 2026

Rating: 5/5

Easy to use for beginners

As someone new to electronics, I was worried this would be too complex. It turned out to be very straightforward. The digital output makes logic simple: high or low based on light. The analog output is a nice bonus for more granular data.

Anonymous

Mar 02, 2026

Rating: 4/5

Solid component, small form factor

The size is compact which fits well into my enclosure. The only reason for 4 stars instead of 5 is that the mounting holes are a bit tight for standard M3 screws, but they work if you are careful. Functionality is top-notch.

5 FAQ

Q: Does this come with jumper wires for connection?

A: No, the package includes only the sensor module. Jumper wires are sold separately, but standard female-to-female Dupont wires work perfectly.

Q: What is the difference between the DO and AO pins?

A: DO (Digital Output) provides a HIGH or LOW signal based on your threshold setting, while AO (Analog Output) provides a variable voltage representing the exact light intensity detected.

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

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

Q: Can this module be powered directly by a 3.3V microcontroller?

A: Yes, the operating voltage range is DC 3.3V to 5V, so it is fully compatible with 3.3V systems like the ESP32 or ESP8266.

Q: Is the LM393 chip replaceable if it gets damaged?

A: Yes, the LM393 is a standard comparator IC in an SOP-8 package and can be replaced with proper soldering skills if necessary.

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