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SmartElex NS412 Digital PIR Motion Sensor Module

SmartElex NS412 Digital PIR Motion Sensor Module

₹127.00Price
🔹 Overview
The SmartElex NS412 PIR Motion Sensor Module is a compact, low-power digital passive infrared (PIR) sensor used for human motion detection.
  • Integrates:
    • Pyroelectric sensing element
    • Digital signal processing circuit
  • Provides direct digital output (HIGH/LOW)
  • Designed for low-power embedded and automation systems
👉 Combines sensing + processing in a single module for stable detection
🔹 Working Principle
  • Detects infrared radiation changes from human body movement
  • Internal flow:
    • IR change → analog signal
    • Amplification + filtering
    • Digital conversion (threshold detection)
  • When motion exceeds threshold:
    • REL output is triggered (digital HIGH)
👉 All signal processing is done inside the chip
🔹 Internal Architecture
  • Pyroelectric IR sensing element
  • High-impedance differential amplifier
  • Digital processing IC
  • Band-pass filter (removes noise)
  • Threshold detection logic
👉 Includes electromagnetic shielding for stability
🔹 Electrical Characteristics
  • Operating Voltage: 2.2V – 3.7V
  • Static Current Consumption: < 11 µA
👉 Ultra-low power → suitable for battery-powered devices
🔹 Detection Characteristics
  • Detection Range: up to 10 meters
  • Detection Angle: ~120° (horizontal)
  • Sensing Window Size: ~3 × 4 mm
👉 Performance depends on Fresnel lens used
🔹 Output Characteristics
  • Output Type: Digital (HIGH / LOW)
  • Signal Behavior:
    • HIGH → Motion detected
    • LOW → No motion
👉 Directly compatible with microcontrollers
🔹 Functional Features
  • Integrated digital PIR processing
  • Adjustable delay time via external resistor
  • Built-in:
    • Noise filtering
    • RF interference suppression
    • Stable threshold detection
🔹 Performance Characteristics
  • High noise immunity
  • Low false triggering
  • Short warm-up time
  • Stable operation in noisy environments
🔹 Functional Behavior
  • Detects only motion (dynamic IR changes)
  • Best detection when movement is:
    • Across sensor field (side motion)
  • Outputs:
    • Digital pulse with configurable delay
🔹 Key Technical Features
  • Ultra-low power consumption (<11 µA)
  • Digital output (no external amplifier needed)
  • Wide detection angle (120°)
  • Long sensing range (~10 m)
  • Adjustable delay timing
  • Integrated signal processing
  • Compact module design
🔹 Advantages
  • Very low power consumption
  • Simple digital interface
  • Stable and reliable detection
  • Compact and lightweight
  • Easy integration into embedded systems
🔹 Limitations
  • Cannot detect stationary objects
  • Performance affected by:
    • Temperature changes
    • External heat sources
  • Requires proper lens and placement
  • Limited configuration compared to advanced PIR ICs
🔹 Technical Summary
The NS412 module is a low-power digital PIR motion sensor that:
  • Integrates IR sensing + signal processing
  • Provides direct digital motion output
  • Is optimized for compact, battery-powered, and IoT applications
👉 Compared to higher-end PIR sensors:
  • Simpler but very power-efficient
  • Good balance of range, stability, and ease of use
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