Wireless Window State Detection Using Magnetometer and Timer Logic
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Solution Overview
Problem
The existing methods for detecting and associating the state of windows, particularly tilt-and-turn windows, with remote devices are costly and require additional components, making them inaccessible and inefficient for widespread installation in buildings.
Innovation Solution
A method and system that associate a device for detecting the position of a window in multiple states with a remote device via a radio link without adding extra components, using a time delay mechanism to determine the window's state and transfer an association request frame if the locking and different positions are detected consecutively, allowing for efficient communication and surveillance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated switches are used to connect two devices, then the association between devices is established, but the installation cost significantly increases and the switches become difficult to access due to device location
Solution Approach 1:
The patent extracts the association function from physical dedicated switches and implements it through wireless communication protocols. The detection device and remote device establish associations by exchanging identification frames and association requests wirelessly, eliminating the need for physical switch installation and reducing installation costs while maintaining reliable device pairing
Solution Approach 2:
The patent introduces an intermediary association protocol that mediates between the detection device and remote device. This protocol uses wireless frame exchange with identification codes and association requests to establish connections, serving as a mediator that replaces the need for physical dedicated switches and their associated installation complexities
2Reliability
If multiple status detectors are installed to monitor each window opening, then the monitoring coverage is complete, but the installation cost increases due to the number of detectors required
Solution Approach 1:
The patent implements a universal detection device that can monitor multiple window states (open, closed, tilted, turned) through a single integrated unit. The device uses a magnetometer to detect the position of a magnet attached to the window, providing comprehensive monitoring coverage across all window configurations without requiring multiple specialized detectors
Solution Approach 2:
The patent changes the detection parameter from multiple specialized sensors to a single magnetometer that detects magnetic field variations. By tracking changes in magnetic field strength and direction, the system determines window position (open, closed, tilted, turned) using one detector, reducing installation costs while maintaining complete monitoring coverage
3Loss of information
If the detection device continuously transmits data, then real-time monitoring is achieved, but the electrical energy consumption increases
Solution Approach 1:
The patent implements periodic transmission where the detection device sends data frames containing window position information at scheduled intervals rather than continuously. The device transitions to low-power mode between transmissions, significantly reducing energy consumption while maintaining real-time monitoring capability through regular periodic updates
Solution Approach 2:
The patent uses feedback mechanisms where the detection device only transmits data when state changes are detected. The magnetometer continuously monitors magnetic field changes, and transmission is triggered only when window position changes occur, reducing unnecessary transmissions and energy consumption while maintaining effective real-time monitoring
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
Enables cost-effective and efficient detection and association of window states, reducing electrical energy consumption and increasing autonomy, while allowing for real-time monitoring of window positions to prevent intrusion attempts.
Implementation Method 1
la mise en place d'un élément mobile (210) sur le dispositif de réglage de l'ouverture (20) ; la mise en place de trois capteurs (ILS1 à ILS3) de type reed switch ; caractérisée en ce que le dispositif de détermination de l'état de l'ouverture (20) comprend un magnetomètre
Data Source
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Figure 6a~6c
AI summary
The present invention relates to a method and a system for connecting a detection device, for detecting a position of a handle of a window in at least two different states, to a remote device by use of a radio link, wherein: - a first position corresponding to locking of the window is detected (E703), - a timer of a predetermined duration is activated (E705), - a position, different from the position corresponding to locking of the window, is detected (E710, E714), - a frame comprising the identifier of the detection device for detecting the position of the handle and a piece of information representing a connection request are sent (E721) if the position corresponding to locking of the window and if the detection of the position different from the position corresponding to the locking of the window are detected at least three consecutive times (E719) during the predetermined period.