Infrared Motion Detection Sensor Module This sensor module offers reliable human body detection for a wide range of smart home, security, and automation applications. Designed with precision and stability in mind, it provides consistent performance and simple options. Key Features and Benefits: Accurate Detection: Utilizes the human body's infrared radiation to detect movement. When a person enters the detection area, the thermal element inside the sensor registers changes in voltage and converts them into a stable digital signal. Output is given as either a or low level to indicate presence. Adjustable Output Delay: Default level output duration is 2.5 seconds. Users can easily adjust this delay by replacing a specific chip resistor. Reference diagrams are provided to match resistor values to desired delay times. Smooth Startup Operation: After power is applied, the module outputs a level for 2 seconds before switching to low level and entering standby. If the output delay is modified, startup time for entering normal working state will change proportionally. Broad Application Range: Suitable for smart home systems such as automatic lighting control and smart door locks; security monitoring including intrusion detection and area surveillance; energysaving control such as automated lighting or climate systems; and other devices including smart doorbells, automatic curtains, and intelligent trash cans. Simple Trigger Mode: Repeated triggering mode ensures continuous detection when motion is present. This mode is fixed and cannot be adjusted. Performance Notes: 1. To disable daytime operation, a photosensitive element can be soldered onto the module. Use a 24V lowvoltage soldering iron for safety. 2. During installation, avoid placing the sensor near heat sources such as direct sunlight or air outlets to prevent false triggers. Practical Use Scenarios: Install in a hallway to trigger lighting only when movement is detected, reducing energy costs. Pair with a smart lock to automatically secure entry points when no motion is detected inside. Integrate into a surveillance system to activate cameras or alarms when movement is sensed in restricted areas. This infrared motion detection sensor module delivers dependable performance, flexible delay configuration, and a compact design suited to modern smart automation projects. Its durable construction and clear operating parameters make it a trusted choice for both DIY developers and professional installers.