Switch-Box Motion Sensor Assembly for Accurate Occupancy Detection
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Solution Overview
Problem
Existing motion sensors for security and occupancy detection often require complex installation, have limited flexibility in mounting options, and may trigger false positives due to environmental factors like animal movement or changes in temperature and airflow.
Innovation Solution
A modular motion sensor assembly that can be easily installed by consumers, featuring a compact design for attachment to electrical switch boxes, wireless communication, and integration with various types of electrical outlets, along with additional sensors like temperature and light sensors to enhance discrimination between valid and invalid motion events, using a combination of passive infrared and radar technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceiling-mounted passive infrared sensors are hard-wired into a security system using multi-conductor cables, then reliable motion detection is achieved, but installation complexity and wiring requirements increase
Solution Approach 1:
The patent replaces the mechanical/electrical wiring system with a wireless communication system. The motion sensor assembly communicates with the alarm panel via wireless signals (RF, Wi-Fi, or other wireless protocols), eliminating the need for multi-conductor cables and complex hard-wiring while maintaining reliable motion detection functionality
Solution Approach 2:
The patent introduces a wireless communication intermediary between the motion sensor and the alarm panel. This intermediary enables data transmission without physical cable connections, simplifying installation while preserving the reliability of the security system through established wireless communication protocols
2Ease of operation
If battery-powered sensors with radio frequency signals are used, then installation flexibility improves, but signal reliability and range may be limited
Solution Approach 1:
The patent creates a multi-functional power system that can operate in multiple modes: battery-powered mode for maximum installation flexibility, and hard-wired power mode for enhanced signal reliability and unlimited operation. The sensor assembly includes both battery components and hard-wired power connection capabilities, allowing the system to adapt to different installation requirements and maintain reliability across various operating conditions
3Device complexity
If single-type motion sensors are used, then device simplicity is maintained, but false positives from environmental factors increase
Solution Approach 1:
The patent combines multiple sensing technologies (passive infrared sensors for thermal detection, radar sensors for motion detection, temperature sensors for environmental monitoring, and light sensors for ambient conditions) into a single integrated motion sensor assembly. This multi-sensing approach enables the system to differentiate between genuine motion events and environmental false positives by analyzing data from multiple sensor types simultaneously
Solution Approach 2:
The patent implements a feedback mechanism where data from multiple sensors is continuously analyzed and cross-referenced. The processor evaluates inputs from infrared, radar, temperature, and light sensors together, using feedback loops to adjust detection thresholds and algorithms based on environmental conditions, thereby reducing false positives while maintaining system simplicity through integrated processing
4Measurement precision
If modular sensor assemblies with multiple sensors are implemented, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent segments the complex sensing functionality into distinct modular sensor components (infrared sensor module, radar sensor module, temperature sensor module, light sensor module), each with its own optimized circuitry and processing. This segmentation allows for independent testing, replacement, and calibration of individual sensor modules while maintaining the integrated functionality of the complete assembly, thereby managing complexity through modularity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables easy consumer installation, reduces false triggering, and provides reliable occupancy detection by integrating multiple sensors to differentiate between human presence and environmental changes, enhancing the accuracy and flexibility of motion sensing systems.
Implementation Method 1
using a combination of passive infrared and radar technologies
Implementation Method 2
using a combination of passive infrared and radar technologies
Data Source
AI summary
A motion sensor assembly may include a cover plate configured to be mounted to an electrical box. The cover plate may include a front surface configured to face away from the electrical box and a rear surface opposite the front surface. The cover plate may further include an aperture configured to receive a toggle or rocker type switch. A motion sensor may be coupled to the cover plate. A power source and processor may be operably coupled to the motion sensor. Furthermore, the processor may be operably coupled to a communication device.