Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | DC 5V / 12V |
| Sensor Type | Photoresistor (LDR) |
| Output Mode | Digital Switching (Relay) |
| Adjustable Sensitivity | Yes, via Potentiometer |
| Relay Contact Rating | 10A at 250VAC / 30VDC |
| Response Time | < 100ms |
| PCB Dimensions | 32mm x 14mm |
| Mounting Hole Diameter | 3.0mm |
| Indicator LED | Power and Trigger Status |
| Application Range | Street Lights, Night Lamps, Auto Dimming |
Anonymous
Mar 28, 2026
Rating: 5/5
Exactly what I needed
Fast shipping and the product matches the description. I used it to control a 12V LED strip based on ambient light, and it has been running flawlessly for two weeks now.
Anonymous
Mar 21, 2026
Rating: 4/5
Solid component for the price
Works well with both 5V and 12V systems. The relay feels sturdy. Just make sure your load doesn't exceed the amperage rating, which is standard for this size of module.
Anonymous
Mar 15, 2026
Rating: 5/5
Great sensitivity range
Even in low-light conditions like twilight, this sensor picks up the change perfectly. The potentiometer allows for fine-tuning so it doesn't turn on too early in the evening.
Anonymous
Mar 10, 2026
Rating: 4/5
Good value but instructions could be better
The hardware quality is solid and the relay clicks reliably. I deducted one star because the pinout diagram on the back was a bit faint. Once figured out, it works great for automating my porch light.
Anonymous
Mar 06, 2026
Rating: 5/5
Reliable and compact
I bought three of these for different rooms. They are small enough to fit inside standard junction boxes. The transition from day to night mode is instant without any flickering.
Anonymous
Mar 06, 2026
Rating: 5/5
Perfect for my Arduino project
This module worked exactly as described. The sensitivity adjustment is very smooth, allowing me to set the exact light threshold needed for my garden lights. Wiring was straightforward.
Q: Can this module directly control a 220V AC light bulb?
A: Yes, the onboard relay is rated for 250VAC. However, please ensure the current draw of your bulb does not exceed 10A to maintain safety and longevity.
Q: Does this come with wires included?
A: No, the module is sold as a standalone board without pre-attached wires. You will need to solder your own connection wires or use a terminal block adapter.
Q: Can I use this with a Raspberry Pi GPIO?
A: Yes, but since the Pi GPIO operates at 3.3V logic and this module is optimized for 5V, we recommend using a level shifter or powering the module at 5V while ensuring the signal pin is compatible.
Q: Is the output normally open or normally closed?
A: The default state depends on your wiring, but typically the relay is Normally Open (NO) when no trigger signal is present. You can wire your load to the Common (COM) and NO terminals for standard operation.
Q: How do I adjust the light sensitivity threshold?
A: There is a blue potentiometer on the PCB. Use a small screwdriver to rotate it clockwise to increase sensitivity (trigger in brighter light) or counter-clockwise to decrease it (trigger only in darkness).
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