Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Type	Digital Switch (DO) and Analog (AO)
Pin Configuration	3-Pin or 4-Pin Compatible
Detection Component	High Sensitivity Photoresistor
Comparator Chip	LM393 Voltage Comparator
Sensitivity Adjustment	Blue Potentiometer Included
Board Size	32mm x 14mm x 8mm
Mounting Holes	3mm Diameter for Screws
Indicator LED	Power and Output Status LEDs
Application Compatibility	Arduino, Raspberry Pi, ESP32

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Compact and efficient

Small footprint fits perfectly on my custom PCB. The power LED is bright enough to see status but not annoying. Excellent component for the price point.

Anonymous

Mar 27, 2026

Rating: 4/5

Great value, easy to use

I bought this for a line-following robot prototype that also needs light avoidance. It responds quickly to changes in lighting. Only giving 4 stars because the included header pins were slightly bent, but easily fixed.

Anonymous

Mar 24, 2026

Rating: 4/5

Good sensitivity range

The photoresistor detects even subtle changes in room lighting. I used the analog output to create a dimmer switch logic. Just remember you need to write the code to read the values; it doesn't come with a library.

Anonymous

Mar 18, 2026

Rating: 5/5

Reliable sensor for classroom kits

We ordered twenty of these for our high school electronics club. Every single one worked out of the box. The dual output (analog and digital) makes it versatile for teaching different concepts.

Anonymous

Mar 04, 2026

Rating: 5/5

Perfect for my Arduino sunset lamp

This module works exactly as described. The sensitivity adjustment is very smooth, allowing me to set the exact light threshold needed for my project. Wiring was straightforward with the clear labels on the PCB.

Anonymous

Mar 02, 2026

Rating: 5/5

Works well for outdoor light control

Using this to trigger a relay when it gets dark outside. I put it inside a small waterproof enclosure, and it has been running stable for three weeks. The LM393 chip handles the voltage comparison perfectly.

5 FAQ

Q: What is the maximum current this module can handle?

A: This is a sensor module designed for signal detection, not power switching. The output current is limited (typically around 15-20mA). Do not connect motors or high-power LEDs directly to the output pin; use a transistor or relay module instead.

Q: Can I connect this directly to a 5V Raspberry Pi GPIO?

A: While the module operates at 5V, the Raspberry Pi GPIO pins are 3.3V logic. We recommend using a voltage divider or a level shifter for the output pin to ensure safety, though many users report success reading the digital output directly at low risk.

Q: Is the 3-pin version different from the 4-pin version?

A: Functionally they are identical. The 4-pin version breaks out VCC, GND, DO, and AO separately. The 3-pin version usually combines grounds or omits the analog output depending on the specific batch, but our standard listing includes the full 4-pin header compatibility.

Q: Does this module output both analog and digital signals simultaneously?

A: Yes, the module features two output pins: AO for analog voltage output proportional to light intensity, and DO for a digital high/low signal based on your potentiometer threshold.

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

A: There is a blue potentiometer on the board. Rotate it clockwise to increase sensitivity (trigger in brighter conditions) or counter-clockwise to decrease it (trigger only in darker conditions). Use a small screwdriver for adjustment.

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