Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | DC 5V - 12V |
| Load Capacity | Max 10A Relay Output |
| Sensor Type | Cadmium Sulfide (CdS) Photoresistor |
| Adjustment Method | Potentiometer for Sensitivity Tuning |
| Indicator LED | Yes, indicates relay status |
| PCB Dimensions | 32mm x 14mm x 6mm |
| Mounting Hole Diameter | 3.0mm |
| Response Time | < 10ms |
| Application Scenario | Street Lights, Night Lamps, Automatic Dimming |
| Package Contents | 1x Photoresistor Module |
Anonymous
Mar 30, 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 level where the relay triggers. Great build quality for the price.
Anonymous
Mar 29, 2026
Rating: 4/5
Solid component
The relay click is audible and distinct. The photoresistor reacts quickly to changes in light. I wish the mounting holes were slightly larger for M4 screws, but M3 fits perfectly.
Anonymous
Mar 28, 2026
Rating: 5/5
Exceeded expectations
Very compact and efficient. I integrated it into a custom enclosure for an automatic closet light. The voltage range flexibility (5V-12V) made it compatible with my existing power supply without needing regulators.
Anonymous
Mar 13, 2026
Rating: 5/5
Great for beginners
As someone new to electronics, I found this very easy to use. The LED indicator helps visualize when the switch activates. No complex coding required if you just need a simple light-controlled switch.
Anonymous
Mar 04, 2026
Rating: 4/5
Good value, easy to wire
I used this to control a 12V LED strip in my garden. Wiring was straightforward with clear labels on the PCB. It loses one star because the screw terminals are a bit small for thicker wires, but it works fine with standard jumper wires.
Anonymous
Mar 04, 2026
Rating: 5/5
Reliable dusk-to-dawn sensor
Installed two of these for my solar pathway lights. They have been working consistently for three weeks now, turning on precisely at dusk. The hysteresis seems stable, so it doesn't flicker during twilight.
Q: Can this module directly control a 110V or 220V AC lamp?
A: No, this module outputs a DC signal suitable for low-voltage DC loads or as a trigger signal. To control high-voltage AC appliances, you must connect this module's output to a separate AC-rated relay or contactor.
Q: Does this come with connecting wires?
A: The package includes only the photoresistor module itself. Connecting wires, headers, or power supplies are not included and need to be purchased separately.
Q: Is the sensitivity adjustable?
A: Yes, there is a blue potentiometer on the board. You can rotate it clockwise or counter-clockwise to adjust the light threshold at which the relay switches on or off.
Q: What is the maximum current the onboard relay can handle?
A: The onboard relay is rated for a maximum of 10A. However, we recommend staying below 8A for continuous operation to ensure longevity and prevent overheating.
Q: Can I use this with a 3.3V microcontroller like ESP32?
A: While the sensor part works at 3.3V, the relay coil typically requires 5V to activate reliably. We recommend powering the module with 5V and using a logic level shifter if you are reading the signal pin with a 3.3V MCU, or simply use the module as a standalone switch powered by 5V.
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