Infrared Human Body Sensing Anti-theft

I. Company Profile & Solution Overview

HaiWang (HW INDUSTRIAL CO.,LTD), established in 2004, has over a decade of experience in R&D and manufacturing of human sensing components. We provide one stop infrared human body sensing solutions for smart home security, burglar alarms, and motion detection applications.

Core Product Lines:

Key Capabilities: Motion detection, ultra-low power (10μA standby), stable triggering (anti-EMI/white light), alarm triggering, energy-saving control (light on/off with human presence).

II. Technical Challenges & Solutions

Challenge 1 – Varying distance & angle requirements

Issue: Smart locks need 3-5m; corridor lights 8-10m; warehouses 15m+; angles from 90° to 360°

Solution: 200+ lens models covering 3m~40m+ and 90°~360°; custom lens moulding available

Challenge 2 – Weak PIR output signal

Issue: Analog signals require amplification/filtering/comparison; high design barrier

Solution: Digital-intelligent PIR (built-in ADC, direct digital output); PIR modules (plug-and-play, high/low output); reference designs for analog types

Challenge 3 – Temperature & electromagnetic interference

Issue: Temperature drift, EMI, and strong light cause false/missed alarms

Solution: -20°C~+70°C operation; temperature compensation; 6500lux white-light immunity; built-in filtering; microwave radar as supplement

Challenge 4 – Sensor-lens mismatch

Issue: Poor matching reduces detection distance and increases blind spots

Solution: Verified matching recommendations; technical support for optimal selection; custom lens moulding

Challenge 5 – Performance vs. low power

Issue: Battery-powered devices need both sensitivity and long battery life

Solution: 10μA standby current; repeatable/non-repeatable trigger modes; low-power reference designs

Challenge 6 – Complex selection process

Issue: Dozens of sensors, >100 lenses, multiple modules – where to start?

Solution: Full-process service: requirements analysis → solution recommendation → samples → technical support → mass production

III. Core Components & Configuration

1. PIR Sensor – Core Detection Element

Passively detects infrared changes from moving human bodies via the pyroelectric effect.

2. Fresnel Lens – Optical Component

Focuses IR signals and zones the detection area, extending range from <1m to 10m+.

3. PIR Sensor Module – Plug-and-Play

Integrates sensor + signal processing + comparator + delay control; direct high/low output.

Trigger Modes: Non-repeatable (no re-trigger during delay, low power) – for lights; Repeatable (output stays high while motion continues) – for security.

4. Microwave Radar Module – Supplement Option

Doppler-effect based; penetrates non-metal housings; unaffected by temperature/humidity.

Selection: PIR – detects human IR, µA power, low cost, indoor use. Microwave – detects all moving objects, penetrates housings, unaffected by environment – for outdoor/harsh conditions.

5. Peripheral Circuit Design

Integrate sensor signals with MCU and actuators – amplification, filtering/comparison, trigger control, power management. HaiWang provides reference designs and technical support.

Recommended Configuration Combinations

IV. Technical Advantages

Sensor-Lens Matching: HaiWang offers a complete PIR sensor and Fresnel lens matrix with verified matching recommendations. Technical support helps select the optimal combination; custom lens moulding available.

V. Application Examples

VI. Product Portfolio