Attributes

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

6 reviews

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.

5 FAQ

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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