Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | 5V DC |
| Sensor Type | Photosensitive Resistor (LDR) |
| Output Signal | Digital Switching (TTL) |
| Relay Contact Rating | 250V AC / 10A or 30V DC / 10A |
| Detection Mode | No-Light Activation (Dark Trigger) |
| Sensitivity Adjustment | Potentiometer Included |
| Indicator LED | Power and Status Indicators |
| Mounting Hole Diameter | 3.0 mm |
| PCB Dimensions | 32mm x 14mm |
| Compatibility | Arduino, Raspberry Pi, ESP8266, ESP32 |
Anonymous
Mar 29, 2026
Rating: 5/5
Reliable switching action
I've tested this with a 12V fan setup that turns on when the garage gets dark. The relay handles the load without any issues. The board is compact and fits easily into my enclosure.
Anonymous
Mar 26, 2026
Rating: 4/5
Works well but relay is audible
Functionality is perfect for my garden lighting controller. Just note that the mechanical relay makes a distinct clicking sound when it switches, which might not be ideal for quiet indoor bedrooms, but fine for most applications.
Anonymous
Mar 19, 2026
Rating: 5/5
Perfect for my automatic night light project
This module worked exactly as described. The sensitivity potentiometer makes it very easy to calibrate for different lighting conditions. I used it with an Arduino Uno to control a small LED strip, and the relay clicks reliably when the room gets dark.
Anonymous
Mar 14, 2026
Rating: 5/5
Sturdy construction
The soldering points are clean and the components feel secure. I appreciate the dedicated power LED so you know immediately if the module is receiving voltage. Highly recommended for IoT prototypes.
Anonymous
Mar 10, 2026
Rating: 4/5
Good value, clear instructions needed
The hardware quality is solid for the price. It took me a moment to figure out which pin was normally open vs normally closed, but once wired correctly, it functions great. Would recommend having a multimeter handy for first-time users.
Anonymous
Mar 06, 2026
Rating: 5/5
Great for learning embedded systems
Bought a pack of these for a student workshop. They are robust enough to handle beginner wiring mistakes and provide consistent results. The digital output simplifies the code significantly compared to reading analog values.
Q: Is the 'No-Light' detection adjustable?
A: Absolutely. There is a blue potentiometer on the board. Turning it allows you to set the exact lux level at which the relay triggers, making it suitable for dusk-to-dawn or total darkness applications.
Q: What is the current draw of the module itself?
A: The module typically draws about 20-30mA when the indicator LEDs are on and the relay is inactive. When the relay activates, it may draw an additional 40-50mA depending on the specific relay coil resistance.
Q: Can this module directly control a 220V lamp?
A: Yes, the onboard relay is rated for 250V AC. However, please ensure you follow proper safety guidelines when working with mains electricity and enclose high-voltage connections securely.
Q: Does this output an analog value or just high/low?
A: This specific module provides a digital output (High/Low) based on the threshold set by the potentiometer. If you need raw analog light levels, you would need to connect the LDR directly to an ADC pin without using the comparator circuit on this board.
Q: Can I use this with a 3.3V microcontroller like ESP8266?
A: Yes, the digital output is TTL compatible and generally works with 3.3V logic. However, the module should still be powered with 5V to ensure the relay operates correctly. Ensure your microcontroller pin can handle the input voltage or use a level shifter if necessary.
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