Self-Calibrating Contact Sensor Using Magnetometer and Accelerometer
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Solution Overview
Problem
Door and window sensors that use magnetic switches require calibration, which can be cumbersome due to variations in frame types and barrier opening mechanisms, necessitating manual adjustment of magnet or sensor positions.
Innovation Solution
The integration of an accelerometer and magnetometer in the sensor allows for self-calibration by recording magnetic and acceleration data during normal operation, determining typical open and closed positions based on historical readings, eliminating the need for manual calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration of magnetic switch sensors is performed, then sensor accuracy is ensured, but installation time and complexity increase
Solution Approach 1:
The sensor device automatically determines its own calibration parameters by detecting magnetic field vectors at different barrier positions using an integrated magnetometer and accelerometer. The device performs self-calibration by recording magnetic field data during normal operation without requiring installer intervention to adjust mounting positions.
Solution Approach 2:
The system performs calibration data collection during normal barrier operation before final sensor deployment. The magnetometer and accelerometer record magnetic field vectors at various positions during the barrier's open and closed states, establishing calibration parameters in advance without requiring separate manual calibration steps.
2Measurement precision
If manual adjustment of magnet or sensor position is performed, then sensor accuracy is ensured, but ease of operation deteriorates
Solution Approach 1:
The sensor device automatically determines its own calibration parameters by detecting magnetic field vectors at different barrier positions using an integrated magnetometer and accelerometer. The device performs self-calibration by recording magnetic field data during normal operation without requiring installer intervention to adjust mounting positions.
Solution Approach 2:
The patent replaces the mechanical adjustment process with an electronic/self-calibrating system. Instead of manually positioning the magnet or sensor to achieve proper alignment, the system uses a magnetometer and accelerometer to automatically detect magnetic field vectors and determine calibration parameters through software processing.
3Measurement precision
If manual calibration for different frame types is performed, then measurement precision is maintained, but device complexity increases
Solution Approach 1:
The patent creates a universal calibration system that works across different barrier types (sliding, swinging, folding) and frame configurations. The magnetometer and accelerometer combination with automatic vector analysis provides a single calibration method that adapts to various mechanical configurations without requiring type-specific calibration procedures.
Solution Approach 2:
The patent replaces the mechanical adjustment process with an electronic/self-calibrating system. Instead of manually positioning the magnet or sensor to achieve proper alignment, the system uses a magnetometer and accelerometer to automatically detect magnetic field vectors and determine calibration parameters through software processing.
4Ease of operation
If self-calibration using magnetometer and accelerometer is implemented, then ease of operation improves, but device complexity increases
Solution Approach 1:
The patent combines the magnetometer, accelerometer, and processing logic into an integrated sensor device. This merging of components consolidates the calibration functionality within a single unit, eliminating the need for separate calibration tools or procedures while maintaining ease of installation.
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
This approach simplifies the installation process by automatically determining and storing vector values for open and closed positions, providing accurate sensor status updates without requiring manual calibration, thus enhancing operational efficiency and user convenience.
Implementation Method 1
The device accesses magnetometer data of a magnetometer sensor in the device
Implementation Method 2
The device accesses accelerometer data of an accelerometer sensor in the device
Data Source
AI summary
A method for calibrating a device is described. The device accesses magnetometer data of a magnetometer sensor in the device, and accelerometer data of an accelerometer sensor in the device. The device determines a first position and a second position of the device based on the magnetometer data and the accelerometer data. The device determines a first magnetic vector based on the magnetometer data at the first position of the device, and a second magnetic vector based on the magnetometer data at the second position of the device. The device then assigns the first magnetic vector to the first position of the device, and the second magnetic vector to the second position of the device.