SmartElex BS612 PIR Motion Sensor Module

Product Overview

The SmartElex BS612 PIR Motion Sensor Module is a digital passive infrared (PIR) motion detection module that integrates:

• Pyroelectric sensing element

• Digital signal processing circuit

• Electromagnetic shielding

It detects human motion by sensing infrared radiation changes and provides a processed digital output signal.

Working Principle

• Detects infrared radiation variation caused by moving human bodies

• Internal circuit converts analog PIR signal ADC digital signal

• When signal exceeds threshold REL output triggered (motion detected)

Electrical Characteristics

• Operating Voltage: 2.2V 3.7V

• Power Consumption: < 12 A (ultra-low power)

• Designed for low-pul>

  Detection Characteristics

  • Detection Range: Up to 12 meters (with Fresnel lens)

  • Detection Angle: ~120 (horizontal)

  • Sensing Window: ~3 4 mm

  Output Characteristics

  • Output Type: Digital (HIGH / LOW)

  • Signal Name: REL output

  • Behavior:

    • HIGH Motion detected

    • LOW No motion

  • Built-in timing control (pulse output duration)

  Internal Features

  • Integrated digital signal processing (DSP)

  • Built-in filtering (noise & RF interference suppression)

  • High power supply rejection ratio

  • Stable detection with reduced false triggering

  Functional Pins / Control Features

  • REL Pin: Din:

    • Enables/disables output

    • Can be used with light sensor for automatic control

  • External components allow:

    • Sensitivity adjustment

    • Delay time adjustment

  Physical Characteristics

  • Dimensions: ~34 11 7 mm

  • Weight: ~3 g

  • Compact PCB with Fresnel lens

   

  Key Technical Features

  • Fully integrated PIR + digital processing

  • Ultra-low standby current

  • Wide-angle and long-range detection

  • Adjustable sensitivity and timing

  • Electromagnetic shielding for stability

  • Direct digital interface (no external ADC needed)

   

  Functional Behavior

  • Detects motion only (dynamic IR change)

  • Best detection when motion is across the sensor field

  • Output includes timed/li>

  • Internal processing eliminates need for external filtering

   

  Limitations

  • Cannot detect stationary objects

  • Performance affected by:

    • Ambient temperature

    • Lens quality

    • Movement direction and speed

  • Sensitive to strong IR sources (sunlight, heat emitters)</