Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	5516 Photoresistor Module
Pin Count	4-Pin Interface
Operating Voltage	3.3V - 5V DC
Output Signal	Digital Switching (DO)
Detection Component	Photoresistor (LDR)
Adjustability	Sensitivity Potentiometer Included
Indicator	Green Power LED, Red Output LED
Board Dimensions	32mm x 14mm
Mounting Hole Diameter	3.0mm
Application	Light Control, Arduino, Raspberry Pi Projects

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Perfect for my night light project

This sensor module works exactly as described. The sensitivity adjustment is very smooth, allowing me to set the exact lux level where the switch triggers. Easy to connect to my Arduino Uno.

Anonymous

Mar 09, 2026

Rating: 4/5

Good value, clear instructions needed

The hardware quality is solid and the response time is fast. I deducted one star because it didn't come with a pinout diagram, but a quick search online solved that. Works great for automation.

Anonymous

Mar 08, 2026

Rating: 5/5

Great starter sensor

As a beginner, I found this very easy to use. The potentiometer lets you test thresholds without changing code immediately. Excellent product for learning electronics.

Anonymous

Mar 07, 2026

Rating: 4/5

Does the job well

Solid build quality. The LEDs are bright enough to see status clearly but not blinding. Just ensure you supply the correct voltage to avoid damaging the comparator chip.

Anonymous

Mar 06, 2026

Rating: 5/5

Compact and sensitive

Small footprint fits perfectly on my custom PCB. The photoresistor reacts quickly to changes in ambient light. Highly recommended for anyone building light-activated switches.

Anonymous

Mar 01, 2026

Rating: 5/5

Reliable for school robotics

Bought five of these for a class project. All of them worked out of the box. The digital output makes coding very simple compared to reading analog values directly.

5 FAQ

Q: How do I adjust the sensitivity?

A: There is a blue potentiometer on the back of the board. Rotate it clockwise or counter-clockwise while exposing the sensor to your target light condition until the red output LED toggles as desired.

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

A: This specific 4-pin model provides a digital output (DO) indicating whether the light level is above or below the threshold. It does not expose the analog signal on the standard 4 pins.

Q: Can this detect infrared light?

A: The photoresistor is primarily sensitive to visible light. While it may react slightly to strong near-infrared sources, it is not optimized for IR detection. We recommend an dedicated IR sensor for those applications.

Q: Is this compatible with 3.3V systems like ESP32?

A: Yes, the module operates comfortably within the 3.3V to 5V range, making it fully compatible with ESP32, ESP8266, and Raspberry Pi GPIO pins.

Q: What is the maximum current this board can switch?

A: The onboard comparator output is designed for logic signals (microcontroller inputs) and should not be used to drive high-current loads directly. Please use a relay or transistor for driving motors or high-power LEDs.

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