Attributes

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

6 reviews

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.

5 FAQ

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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