AM312 Mini Pyroelectric PIR

The AM312 Mini Pyroelectric PIR is an ultra-miniature, low-power digital motion sensor. It detects human and animal movement by sensing changes in infrared (IR) radiation. Ideal for battery-powered smart home and security projects, it integrates all processing circuitry on a microscopic scale, providing direct logic outputs for microcontrollers. 

Core Specifications

·        Operating Voltage: DC 2.7V to 12V

·        Static Power Consumption: Ultra-low (typically <0.1mA or ~60µA)

·        Detection Range: 3 to 5 meters

·        Sensing Angle: Up to a 100° cone angle

·        Output Level: 3.3V (High when triggered) / 0V (Low)

·        On-time Delay: ~2 seconds (fixed)

Key Features

·        Digital Signal Processing (DSP): Built-in digital filtering to screen out unwanted frequency interference and prevent false triggers.

·        Repeatable Trigger: If motion is continuously detected during the active countdown, the ~2-second delay period resets and restarts.

·        Ultra-compact: The sensor module (excluding lens) is extremely small, typically around 10mm x 8mm.

·        Wide Operating Range: Operates effectively in temperatures from -20°C to +60°C. 

Pinout Configuration

The module typically features 3 connection pins: [1]

·        VCC: Power input (connect to 2.7V - 12V)

·        OUTPUT: Signal pin (goes to 3.3V when motion is detected)

·        GND: Ground connection 

·        Common Applications

·        Battery-operated motion alarms

·        Hidden/spy cameras and smart doorbells

·        Automated indoor/outdoor lighting (e.g., nightlights)

·        IoT occupancy and security sensors