Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | 3.3V - 5V DC |
| Output Signal | Digital Switching Output (0 and 1) |
| Sensor Type | Photoresistor (LDR) |
| Comparator Chip | LM393 |
| Detection Range | Visible Light Spectrum |
| Sensitivity Adjustment | Via Onboard Potentiometer |
| PCB Dimensions | 32mm x 14mm |
| Mounting Hole Diameter | 3mm |
| Interface Compatibility | Arduino, Raspberry Pi, STM32 |
| Package Contents | 1x Sensor Module, 1x Pin Header |
Anonymous
Mar 26, 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 doesn't come with a printed guide, but there are plenty of tutorials online for this specific LM393 setup.
Anonymous
Mar 20, 2026
Rating: 5/5
Bought 10 for our student workshop
We used these for a line-following robot variation that reacts to light sources. All units performed consistently. The digital output makes it very easy for beginners to integrate without complex analog coding.
Anonymous
Mar 18, 2026
Rating: 5/5
Compact and reliable
Small form factor fits perfectly in my enclosed weather station case. It has been running outdoors (protected from rain) for two weeks with no drift in performance.
Anonymous
Mar 17, 2026
Rating: 4/5
Works well once calibrated
Took me a while to understand how to tune the potentiometer correctly, but once I did, the switching action is crisp. Great for learning about comparators.
Anonymous
Mar 09, 2026
Rating: 5/5
Perfect for my smart lamp project
This module works exactly as described. The sensitivity adjustment is very precise, allowing me to set the exact light threshold for my Arduino-based night light. Setup took less than 10 minutes.
Anonymous
Mar 08, 2026
Rating: 5/5
Standard reliable component
If you need a basic light detection switch, this is the industry standard module. Low power consumption and stable output. Highly recommended for prototyping.
Q: Can I connect this directly to a 5V Raspberry Pi GPIO?
A: Yes, the module operates on 3.3V to 5V. When powered by 5V, the digital output is compatible with Raspberry Pi GPIO pins. Just ensure you share a common ground between the Pi and the module.
Q: Does this module provide an analog output or only digital?
A: This specific model provides a digital switching output (High/Low) via the LM393 comparator. However, many versions of this board also expose the raw analog signal on a separate pin if you need variable light intensity data.
Q: What is the maximum current this sensor can handle?
A: The sensor itself draws very little current (typically under 10mA). The output pin can source/sink up to 20mA, which is sufficient to drive a small LED or a logic input, but not a high-power relay directly.
Q: Do you ship with the pin headers pre-soldered?
A: No, to prevent damage during shipping and to give you flexibility in mounting, the pin headers are included in the bag but are not pre-soldered to the PCB. You will need to solder them yourself.
Q: Is the potentiometer sensitive enough for indoor lighting changes?
A: Absolutely. The onboard trimmer pot allows for fine-tuning. You can easily distinguish between a dark room, typical office lighting, and direct sunlight by adjusting the screw.
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