Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Pin Count | 4-Pin |
| Sensor Type | Photoresistor (LDR) |
| Operating Voltage | 3.3V - 5V DC |
| Output Signal | Digital Switch Output (DO) & Analog Output (AO) |
| Comparator Chip | LM393 |
| Sensitivity Adjustment | Potentiometer included |
| PCB Size | 32mm x 14mm |
| Mounting Hole Diameter | 3mm |
| Compatibility | Arduino, Raspberry Pi, ESP32, STM32 |
| Application | Light intensity detection, automatic night lights, camera exposure control |
Anonymous
Mar 24, 2026
Rating: 5/5
Great dual output feature
Having both analog and digital outputs on the same board is very convenient. I use the analog pin for precise logging and the digital pin for immediate interrupt triggers. No issues so far.
Anonymous
Mar 14, 2026
Rating: 5/5
Perfect for Arduino projects
This sensor module works flawlessly with my Arduino Uno. The analog output gives smooth readings, and the digital threshold is easy to adjust with the onboard potentiometer. Great value for the price.
Anonymous
Mar 12, 2026
Rating: 4/5
Solid build quality
The PCB looks professional with clean soldering. The photoresistor is well-protected. It works exactly as described for detecting day/night cycles in my garden automation system.
Anonymous
Mar 11, 2026
Rating: 5/5
Reliable and compact
Used four of these on a line-following robot chassis to detect ambient light conditions. They are compact, lightweight, and the response time is consistent across all units. Highly recommended.
Anonymous
Mar 08, 2026
Rating: 4/5
Good sensitivity, clear instructions needed
The hardware quality is solid and responds quickly to light changes. I deducted one star because it didn't come with a pinout diagram, but a quick Google search solved that. Works great for my smart lamp project.
Anonymous
Mar 04, 2026
Rating: 5/5
Easy to use for beginners
I am new to electronics, and this module made light detection very simple. Just connect VCC, GND, and the output pin. The LED indicator on the board helps visualize when the threshold is triggered.
Q: How do I calibrate the sensitivity?
A: Use a small screwdriver to turn the blue potentiometer on the board. Rotate it while exposing the sensor to your desired trigger light level until the green LED indicator turns on or off.
Q: Is the mounting hole size standard for M3 screws?
A: Yes, the mounting holes are approximately 3mm in diameter, which fits standard M3 screws commonly used in electronics enclosures and robotics frames.
Q: What is the difference between the DO and AO pins?
A: AO (Analog Output) provides a variable voltage corresponding to the light intensity, which you read via an ADC. DO (Digital Output) goes HIGH or LOW based on a threshold you set using the blue potentiometer.
Q: Can this sensor detect infrared light?
A: This module uses a standard photoresistor optimized for visible light. While it may react slightly to strong IR sources, it is not designed for dedicated infrared detection applications.
Q: Does this module work with 3.3V logic levels like the ESP32?
A: Yes, the module operates comfortably within the 3.3V to 5V range, making it fully compatible with ESP32, ESP8266, and standard 5V Arduinos.
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