XH M131 Development Board — Photosensitive Sensor Module with Relay Control Key benefits Automates lighting to save energy and reduce manual intervention: turns lights on at night and off in daylight based on ambient brightness. Simple integration into existing systems: includes cable and mounting hardware for fast installation in industrial or home automation setups. Reliable switching for a range of loads: builtin relay lets the sensor directly control lights, alarms, or other equipment without additional drivers. What it does Photosensitive sensor board that detects ambient light and switches a relay when the light level crosses an adjustable threshold. Onboard potentiometer allows you to set the brightness level at which the relay activates or deactivates. LED indicators: red LED shows power status, blue LED indicates relay activation. Compatibility and electrical specifications Input voltage compatibility: 5V / 12V / 24V (board operates by default at 12V DC). Reverse polarity protection prevents damage from incorrect wiring. Relay terminals: COM, NO (C K), and (CB) for flexible switching configurations. Relay load ratings: AC 0–125V / 20A or DC 0–14V / 20A. Physical and installation notes Supplied with cable and mounting hardware for straightforward installation on panels, enclosures, or DIN rails. Compact development board format for use in prototyping or permanent installations. Suitable for wired integration with relays, contactors, or control circuits using the provided terminals. Performance and reliability Adjustable sensitivity provides precise control over when lighting or equipment is switched. Onboard protection and status LEDs improve safety and troubleshooting during commissioning and operation. Practical applications Street and pathway lighting: automatically switch street lamps on at dusk and off at dawn to reduce energy use and maintenance. Security and perimeter lighting: ensure lights activate when ambient light falls below a threshold to improve visibility and deterrence. Industrial or home automation: control signage, indicator lights, or auxiliary circuits as part of energysaving or safety systems. What's included 1 × XH M131 Development Board (photosensitive sensor module) Cable for power and signal connections Mounting hardware for installation Important to know Use the correct supply voltage (5V/12V/24V compatible; default 12V DC). Observe the relay's load limits (AC 0–125V/20A, DC 0–14V/20A). Adjust the onboard potentiometer to set the desired activation threshold for your environment. Confirm wiring polarity despite reversepolarity protection; proper wiring ensures longterm reliability.