AM312 Mini IR Human Sensor Module HCSR312 3PCS Compact pyroelectric PIR motion sensor modules designed for easy integration with microcontroller projects. Detect human presence reliably and add motiontriggered behavior to lighting, alarms, automation, and robotics. Key benefits Fast, reliable motion detection: Uses a pyroelectric infrared sensor to detect changes in body heat and trigger a digital output for immediate response. Easy integration: Simple threepin interface makes connection straightforward for Arduino, STM32, Raspberry Pi, and most other microcontrollers. Spacesaving form factor: Small, lowprofile module fits into compact enclosures and tight project layouts. Low power and simple wiring: Suitable for batterypowered designs and embedded systems where low power consumption and simple connections matter. Pack of three: Multiple sensors included for distributed coverage or parallel prototyping. Core features and attributes Function: Passive infrared (PIR) motion sensing that provides a digital output when motion is detected. Compatibility: Works with common MCU platforms such as Arduino, STM32, and Raspberry Pi; compatible with 3.3V and 5V logic level systems when used according to standard wiring practices. Interface: Standard threepin connection for power, ground, and digital output simplifies wiring and coding. Size and material: Compact PCB module with a domeshaped pyroelectric lens; lightweight and easy to mount in custom housings. Performance: Designed for reliable detection of human motion across typical indoor distances and angles; suited to onoff control and presence detection tasks. How this product solves common problems Reduces manual operation: Automatically turn lights or devices on and off based on presence, saving energy and improving convenience. Simplifies prototyping: Plugandplay wiring and clear output make it easy to add motion sensing to projects without complex electronics. Supports scalable solutions: With three modules included, you can cover multiple zones or iterate quickly during development. Practical applications Automatic lighting: Trigger hallway, closet, or cabinet lighting when motion is detected to improve convenience and reduce wasted energy. Security and alarm systems: Add presence detection to basic alarm or alert systems for entry detection and activity monitoring. Smart appliances and robotics: Use as a presence sensor for interactive installations, automated faucets, fans, or mobile robots that respond to nearby people. What you receive Three AM312 Mini IR Human Sensor Modules HCSR312 ready for wiring into development boards and MCU projects. Compact modules that are easy to mount, test, and integrate into prototypes and finished designs. Notes for use Follow standard wiring conventions for power, ground, and output to your controller. Adjust placement and orientation to match your detection zone and minimize false triggers from heat sources or drafts. Test response behavior with your target MCU and code to tune detection timing and threshold logic as needed. This sensor pack provides a practical, compact solution for adding reliable motion detection to a wide range of electronic and automation projects.