DC 5V/12V Photoresistor Relay Module – 10A Light Control Switch
DC 5V/12V Photoresistor Relay Module – 10A Light Control Switch
DC 5V/12V Photoresistor Relay Module – Automatic Light Control Switch
Take the guesswork out of light management with this compact Photoresistor Relay Module. Designed for makers, electronics hobbyists, and automation enthusiasts, this module uses an onboard light-dependent resistor (LDR/photoresistor) to automatically detect ambient brightness levels and switch a connected load ON or OFF — no microcontroller required for basic setups.
Key Features
- Dual Supply Voltage: Compatible with both DC 5V and DC 12V power sources, making it flexible for a wide range of DIY and embedded projects.
- 10A Relay Output: Handles up to 10A switching current, suitable for controlling lights, fans, and other low-to-medium power devices.
- Automatic Brightness Detection: The onboard photoresistor continuously monitors ambient light; the relay triggers automatically when light crosses the set threshold — ideal for dusk-to-dawn control and automation tasks.
- SMD Package: Surface-mount design keeps the board compact and easy to integrate into enclosures or custom PCB assemblies.
- Wide Operating Temperature: Rated from -40°C to +80°C, making it dependable in both indoor and outdoor-adjacent installations.
- No High-Concern Chemicals: The module contains none of the listed high-concern chemical substances.
- Customizable Sensitivity: Adjust the trigger threshold to suit your lighting environment.
Specifications
| Supply Voltage | DC 5V / DC 12V |
| Relay Rating | 10A |
| Sensing Element | Photoresistor (LDR) |
| Package Type | SMD |
| Operating Temperature | -40°C to +80°C |
| Quantity | 1 Module |
| Condition | New |
| Country of Origin | Made in Mainland China |
Common Applications
- Automatic street or garden light control (dusk-to-dawn switching)
- Smart home and DIY automation projects
- Arduino, Raspberry Pi, and microcontroller-based circuits
- Classroom and hobbyist electronics experiments
- Light-triggered alarm or notification systems
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Frequently Asked Questions
Q: What is the difference between the 5V and 12V operating modes on this photoresistor relay module?
A: The module supports both DC 5V and DC 12V supply voltages, so you can power it directly from a 5V USB/Arduino supply or a standard 12V adapter. The relay switching output remains the same (up to 10A) regardless of which supply voltage you use — simply connect the appropriate voltage to the VCC pin.
Q: Can this relay module be used without a microcontroller for automatic light switching?
A: Yes! The onboard photoresistor and control circuit allow the module to detect ambient brightness and trigger the relay automatically without any external microcontroller. Just power the board, connect your load to the relay terminals, and adjust the sensitivity potentiometer to your desired light threshold.
Q: What types of loads can I control with this 10A relay module?
A: The 10A relay is suitable for controlling LED strips, incandescent bulbs, small fans, solenoids, and other resistive or inductive loads within the relay's current and voltage rating. Always ensure the connected load does not exceed the 10A switching capacity and consult local electrical codes for mains-voltage applications.
Q: Is this module suitable for outdoor use given its operating temperature range?
A: The module is rated for -40°C to +80°C, making it thermally capable for a wide range of environments. For outdoor use, we recommend housing it in a weather-resistant enclosure to protect it from moisture and direct exposure to the elements.