5V light-control relay module with onboard photoresistor, blue threshold adjuster and three screw terminals

5V Photoresistor Light-Control Relay Module

$5.99 NZD
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5V light-control relay module with onboard photoresistor, blue threshold adjuster and three screw terminals
  • 5V light-control relay module with onboard photoresistor, blue threshold adjuster and three screw terminals
  • 5V Photoresistor Light-Control Relay Module, PCB length and width marked in millimetres
  • Underside of 5V Photoresistor Light-Control Relay Module, showing PCB solder joints and mounting holes
5V Photoresistor Light-Control Relay Module
SKU: REL-LDR-5V

5V Photoresistor Light-Control Relay Module

$5.99 NZD
Dispatch: Within 24 hours 7-day dispatch, excluding public holidays

NZ Post: 1-2 days urban · 2-4 days rural

Shipping from $5.99 urban / $9.99 rural.

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Easy 30-day returns · 12-month warranty

Free Urban delivery on orders over $66
Urban $66 Rural $88

Switch a low-voltage circuit automatically as the light level changes. This 5V module has an onboard photoresistor and an adjustable threshold, with a changeover relay output for a simple light-controlled project.

Specifications

Supply5V DC
SensorOnboard photoresistor
AdjustmentTrimmer sets switching threshold
Output1 SPDT changeover relay
Supply pinsVCC, GND
Contact terminalsNO, COM, NC
PCB dimensions50 x 26 mm
IndicatorsPower and relay state
Included quantity1 assembled module

Datasheets

Full technical datasheetPDF

What's in the box

1×
5V Photoresistor Light-Control Relay Module

Assembled module with fitted terminals.

Great for

Light-sensitive switching
Low-voltage lighting projects
Electronics demonstrations

Wiring & getting started

  1. Connect the supply

    With power off, connect 5V DC to VCC and supply return to GND. Keep the load disconnected for the first test.

  2. Set the threshold

    Power the module and adjust the trimmer while shading and uncovering the photoresistor. Check the relay click and contact continuity as the light changes.

  3. Connect a small DC load

    Turn power off. Route the separate load circuit through COM and NO for switching when the relay energises, or COM and NC for the opposite state. Keep the sensor clear of light from the controlled load.

Note: The contact ratings printed on the relay describe the fitted component, not a certified rating for the assembled board. Use low-voltage DC for prototyping and keep exposed terminals protected.

Frequently Asked Questions

Answers to the questions buyers ask most.

Does it need an Arduino?
No. It switches according to the light level using its onboard photoresistor and trimmer. It needs the correct DC supply and a separately wired load circuit.
Can I choose whether the load switches on in light or darkness?
Yes. The COM-NO and COM-NC contacts give opposite switching states. Set the threshold under your intended lighting and test the chosen contacts before connecting the load.
Is the light sensor separate?
No. The photoresistor is fitted to the module. Keep it exposed to the light you want to detect.

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Why Buy from NZN

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I'm Lukas, an engineering student and maker based in Te Awamutu. NZN grew out of a CNC build that dragged on for months because every missing cable, bolt or electronic part meant another overseas order. I started the shop so Kiwi makers can spend more time building and less time waiting for the next parcel.

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    Get in touch if something is not right and we will help sort it.

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