Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	12V DC
Sensor Type	Photoresistor (LDR)
Relay Contact Rating	10A 250VAC / 10A 30VDC
Detection Mode	Light Seeking / Light Activated
Sensitivity Adjustment	Potentiometer Adjustable
Output Signal	Digital Switch (High/Low)
PCB Dimensions	45mm x 25mm x 18mm
Mounting Hole Diameter	3.5mm
Response Time	< 10ms
Application	Street Lights, Garden Lamps, Auto Dimming

6 reviews

Anonymous

Mar 29, 2026

Rating: 4/5

Good value, clear instructions needed

The hardware quality is solid and the relay clicks loudly which confirms it's working. However, the diagram on the board is a bit small. Once I figured out the VCC and GND pins, it was smooth sailing.

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect for my garden lighting project

This module worked exactly as described. I connected it to a 12V LED strip for my porch, and the sensitivity adjustment is very precise. It turns on right at dusk without any flickering.

Anonymous

Mar 25, 2026

Rating: 5/5

Easy to integrate

As someone new to electronics, I found this very easy to use. Just power it up and tweak the blue potentiometer until the LED indicator behaves how you want. Works great with my Arduino project too.

Anonymous

Mar 13, 2026

Rating: 5/5

Exactly what I needed

Compact size fits easily into my custom enclosure. The 12V relay handles the load of my halogen bulbs without getting hot. Very satisfied with this purchase.

Anonymous

Mar 03, 2026

Rating: 4/5

Solid component, slight delay

Overall a great sensor module. There is a tiny fraction of a second delay when the light changes, but it's negligible for street light applications. The build quality feels durable.

Anonymous

Mar 01, 2026

Rating: 5/5

Reliable light detection

I've installed three of these for my solar setup. They handle the 12V input perfectly and the photoresistor reacts quickly to changes in ambient light. Highly recommended for automation.

5 FAQ

Q: Can this module handle 24V input instead of 12V?

A: No, this specific model is designed strictly for 12V DC input. Applying 24V may damage the onboard components and the relay coil.

Q: What is the maximum current the relay can switch?

A: The relay contacts are rated for up to 10 Amps at 250V AC or 30V DC. We recommend staying below 8A for long-term reliability.

Q: Can I connect this directly to a mains powered lamp?

A: You can use the relay to switch a mains-powered lamp, but the control side (sensor) must still be powered by a 12V DC source. Ensure proper insulation and safety measures when dealing with mains voltage.

Q: Does the relay stay on when it gets dark or when it gets light?

A: By default, this is a 'light seeking' module, meaning the relay activates when light is detected. However, many versions have a jumper or can be wired inversely to activate in darkness. Please check the specific silkscreen on your board for NO/NC terminals.

Q: Is the sensitivity adjustable automatically or manually?

A: It is manually adjustable using the blue potentiometer located on the PCB. You can turn it clockwise or counter-clockwise to set the exact lux level at which the switch triggers.

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