AM312 human body sensing module Overview The AM312 is a compact digital motion sensor based on passive infrared technology. It delivers sensitivity and reliable performance for automatic sensing and control in lowvoltage systems. The module provides a direct digital or low output and includes internal digital signal processing for improved antiinterference capability. Key benefits Easy integration: Direct and low level output makes the module simple to interface with relays, LEDs, logic inputs and lowvoltage control circuits. Low power: Static current is less than 0.1 mA, suitable for batterypowered or energysensitive applications. Compact size: Small footprint at 10 x 8 x 12 mm allows installation in tight spaces and embedded projects. Stable detection: Internal digital filtering reduces false triggers from interference, improving reliability in real environments. Repeatable trigger behavior: After the output goes , any further human movement detected during the delay period restarts the delay, keeping the output until activity stops. Key specifications Model: AM312 human body sensing module Operating voltage: DC 2.7 to 12 V Static power consumption: less than 0.1 mA Delay time: 2 seconds Blocking time: 2 seconds Trigger mode: repeatable trigger Sensing coverage: up to 100 degrees cone angle, 3 to 5 meters depending on lens Working temperature: 20 to +60 C Size: 10 x 8 x 12 mm Lens: small lens How it works The module detects changes in infrared radiation caused by human motion within its cone of detection. Digital signal processing inside the module rejects common interference sources and outputs a stable digital signal. In repeatable trigger mode, each detected movement during the delay period extends the active output until movement stops. Typical applications Automatic lighting control for hallways, stairwells, storage rooms and cabinets, turning lights on only when movement is detected. Security systems and alarms as a motion input to control circuitry or notification systems. Smart appliances and automation projects where compact, lowpower presence detection is required. Embedded systems and DIY electronics projects that need a compact PIR sensor for occupancy detection. Installation and compatibility Designed for lowvoltage DC systems between 2.7 V and 12 V. Direct digital output is compatible with most logic level inputs, relays, and driver circuits. Small size and simple wiring make it suitable for integration into existing control panels, enclosures and custom electronics. Notes Sensing distance and angle depend on the specific lens used. Typical detection range is 3 to 5 meters with a cone angle up to 100 degrees. Delay time and blocking time are set to 2 seconds as specified. The module uses repeatable triggering, so detected movement during the delay extends the active output.