SmartElex NS612 PIR Motion Sensor Module

Overview

The SmartElex NS612 PIR Motion Sensor Module is a digital passive infrared (PIR) motion detection module designed for human motion sensing.

• Combines pyroelectric sensor + digital control circuitry

• Outputs processed digital signal (no external conditioning required)

• Designed for low-power embedded and IoT systems

Working Principle

• Detects infrared radiation changes emitted by moving human bodies

• Uses a pyroelectric sensing element

• Signal flow:

  • IR change analog signal

  • Internal amplifier + filter

  • ADC + digital processing output signal

   

• When signal crosses threshold REL output triggered

Internal Architecture

• Pyroelectric IR sensing elemeplifier

• Digital signal processing circuit

• Electromagnetic shielding

• Built-in band-pass filtering

All signal processing is done on-chip

Electrical Characteristics

• Operating Voltage: 2.2V 3.7V

• Static Current: < 11 A (ultra-low power)

Suitable for battery-powered devices

Detection Characteristics

• Detection Range: up to 10 meters

• Detection Angle: ~120 (horizontal)

• Sensing Window: 3 4 mm

Range depends on Fresnel lens used

Output Characteristics

• Output Type: Digital (HIGH / LOW)

• Signal Name: REL output

• Behavior:

  • HIGH Motion detected

  • LOW No moti Functional Features

    • Adjustable parameters (via onboard potentiometers):

      • Detection range

      • Response time

       

    • OEN (Enable Pin):

      • Controls output enable

      • Can integrate with light sensor or logic control

       

    • Built-in:

      • Noise filtering

      • RF interference suppression

      • Stable threshold detection

       

     

    Performance Characteristics

    • High signal stability (low false triggers)

    • Short warm-up time

    • High power supply noise rejection

     

    Functional Behavior

    • Detects only motion (dynamic IR changes)

    • Best detection when motion is:

      • Across the sensing field

       

    • Outputs a timed digital pulse after detection

     

    Physical Characteristics

    • Dimensions: ~34 11 7 mm

    • Compact, lightweight module (~3g)

     

    Key Technical Features

    • Integrated PIR + digital processing

    • Ultra-low power consumption (<11 A)

    • Long detection range (~10 m)

    • Wide detection angle (120)

    • Adjustable sensitivity and delay

    • Noise-resistant design

    • Direct digital output

     

    Advantages

    • No external signal conditioning required

    • Easy integration with embedded systems

    • Flexible tuning (range + delay)

    • Stable performance in noisy environments

     

    Limitations

    • Cannot detect stationary objects

    • Sensitive to:

      • Ambient temperature changes

      • External heat sources

       

    • Requires proper lens and positioning

    • Accuracy depends on calibration and environment

     

    Technical Summary

    The NS612 module is a smart PIR motion detection sols sensing + processing in one module

  • Provides reliable digital motion output

  • Is optimized for low-power, embedded, and automation systems