XH-M131 DC Light Control Switch Photoresistor Relay Module-12V

XH-M131 DC Light Control Switch Photoresistor Relay Module (12V) offers a simple yet effective solution for creating automatic lighting systems and darkness-activated controls. This module uses a highly sensitive photoresistor (LDR) to detect ambient light levels, triggering an onboard relay when the light drops below a preset threshold. Operating directly from a standard 12V DC power source, the module allows you to power and control devices that require higher current or different voltages (AC or DC). You can easily adjust the switching sensitivity using the included onboard potentiometer, fine-tuning the point at which the relay activates to perfectly suit your environment, making it an indispensable component for automating outdoor security lights, garage lighting, or solar-powered systems.

Key Features:

• Automatic Light Sensing: Employs a photoresistor (LDR) to detect ambient illumination, enabling automatic operation based on darkness or light.
• Adjustable Sensitivity: Features an onboard precision potentiometer, allowing you to fine-tune the exact light level that triggers the relay.
• High-Current Relay Output: Includes a single-pole, double-throw (SPDT) relay, letting you control high-power AC or DC loads directly.
• Robust 12V Operation: Designed to run reliably on a standard 12V DC input, making it compatible with common battery and power supply setups.
• Indicator LEDs: Provides separate LEDs to indicate power status and relay trigger status for easy debugging and operation monitoring.

Technical Specifications:

• Operating Voltage: 12 V DC
• Control Current (Quiescent): ≈ 15 mA
• Control Current (Active): ≈ 45 mA
• Switching Capacity (Max): 10 A @ 250 V AC or 10 A @ 30 V DC
• Trigger Sensor: Photoresistor (Light Dependent Resistor, LDR)

Mechanical Specifications:

• Board Material: FR-4 PCB
• Relay Type: SPDT (Single Pole, Double Throw)
• Adjustability: Single Turn Potentiometer for light threshold calibration.
• Output Connections: Screw Terminal Blocks for Power and Relay Contacts (NO/NC/COM).

Dimensions:

• Module Length: ≈ 50 mm
• Module Width: ≈ 26 mm
• Module Height: ≈ 19 mm
• Weight: ≈ 16 g

Pinout and Wiring:

• VCC: Connect to 12V DC positive (+) power supply.
• GND: Connect to 12V DC negative (-) or ground.
• COM (Common): Connect to one side of the load power supply.
• NO (Normally Open): Connect to the other side of the load. When dark, the relay switches and power flows.
• NC (Normally Closed): Connected to COM when the module is powered but the relay is off (daylight).

Datasheet Reference:

• Download XH-M131 Module Manual

Commonly Used in:

• Security Systems: Automating perimeter and gate lighting to turn on at dusk.
• Solar Projects: Activating devices or charging circuits only when ambient light is low.
• Educational Electronics Kits: Teaching concepts of photoresistors, relays, and automatic control systems.

Applications:

• Dusk-to-Dawn Lighting: Automatically turning on street lights, porch lights, or garden illumination.
• Automated Blinds/Curtains: Using the light level to control motorized window coverings.
• Darkroom Safety Switch: Ensuring that equipment only operates in a light-controlled environment.

Equivalent Models:

• XH-M131-5V: A variant operating on a 5V DC supply, often used with Arduino or Raspberry Pi.
• AC Photoelectric Switch: Fully enclosed, commercial units for direct wiring into AC main power lines.
• Dedicated LDR Sensor Module: Outputting a digital or analog signal that requires an external microcontroller and relay board.

Package Includes:

• 1 x XH-M131 DC Light Control Switch Photoresistor Relay Module (12V)