Pulse Oximeter Hall Sensor and Acceleration Display Control
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Solution Overview
Problem
Conventional portable pulse oximeters consume power unnecessarily when not in use and display data inconveniently due to cable constraints and orientation issues.
Innovation Solution
A digital portable pulse oximeter with a Hall circuit for automatic power switching and an acceleration sensor to ensure data visibility, featuring a housing design with a pivot and reset spring, and a dual-input logic control gate circuit for intelligent power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pulse oximeter remains in power-on state for continuous operation, then the device is ready for immediate measurement, but the battery is consumed unnecessarily when no measurement is being carried out
Solution Approach 1:
The pulse oximeter dynamically adjusts its power state based on operational needs. The system transitions between power-on and power-off states automatically, with the housing body opening action triggering power-on and closing action triggering power-off. This dynamic state adjustment resolves the contradiction by making the device responsive only when needed.
Solution Approach 2:
The pulse oximeter uses its own structural movements (housing opening/closing) to automatically control power state transitions without external intervention. The system self-regulates power consumption by detecting its own operational state through the mechanical action of the housing, eliminating the need for manual power management.
2Device complexity
If the display is disposed on the finger clamp, then the device structure is compact, but the data displayed cannot face the users when the finger clamp orientation changes
Solution Approach 1:
The display orientation is made dynamic through the acceleration sensor and control circuitry. The display automatically rotates or reorients itself based on the detected orientation of the finger clamp, ensuring data always faces the user. This dynamic adaptation resolves the contradiction between compact structure and data visibility.
Solution Approach 2:
The acceleration sensor provides continuous feedback about the finger clamp's orientation to the control circuit, which then adjusts the display orientation accordingly. This feedback loop ensures the display remains properly oriented toward the user regardless of how the finger clamp is positioned.
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 automatic power-on upon finger insertion, intelligent power-off when not in use, and ensures data visibility regardless of user movement, reducing energy waste and prolonging battery life.
Implementation Method 1
The Hall switch sensor and the magnet are respectively disposed in the upper housing body and the lower housing body at the measurement end of the housing body, the magnet induces the output pin of the Hall switch sensor to generate a high-low potential change
Data Source
AI summary
The present invention relates to a digital portable pulse oximeter and battery-powered control method thereof. The automatic switching of the power supply is achieved by adding a Hall circuit, and the data displayed is allowed to always face the users by adding an acceleration sensor to the circuit. The advantageous effects of the present invention compared with the prior art are: Users can always read the data from the front side no matter which way they move. The digital portable pulse oximeter of the present invention can be automatically turned on just by inserting a finger, without having to press the switch button, and cut off the power supply by pulling out the finger, as well as judge intelligently whether to continue the measurement after the finger has been pulled out. If yes, the power supply will stay on, which reduces the energy waste and low efficiency caused by the restarting program initialization, improves the use efficiency of the battery and prolongs the battery life.