Hygienic Sheet Dispenser Passive Mode for Battery Life
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Solution Overview
Problem
Automatic paper dispensers have high power consumption due to continuous user detection, limiting battery life, especially in low-usage periods.
Innovation Solution
Implementing a mode-switching mechanism that activates a passive energy-saving mode after a predetermined time without user detection, where the dispenser deactivates sensors and motors to minimize power usage, and reactivates upon product removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dispenser continuously scans for users using the first sensor in active mode, then user detection capability is improved, but power consumption increases
Solution Approach 1:
The dispenser dynamically switches between active mode (continuous scanning) and passive mode (minimal scanning) based on usage patterns. The microcontroller monitors sensor activity and transitions the system state to optimize the balance between user detection reliability and power consumption, making the scanning behavior adaptive rather than static.
Solution Approach 2:
Instead of continuous scanning, the dispenser implements periodic scanning in passive mode where the first sensor performs scans at predetermined intervals. This periodic action maintains basic user detection capability while significantly reducing power consumption compared to continuous active scanning.
2Duration of action of moving object
If the dispenser switches to passive mode to reduce power consumption, then battery life is extended, but response time to user presence increases
Solution Approach 1:
Before switching to passive mode, the dispenser pre-dispenses a length of product out of the dispensing opening. This preliminary action ensures that when a user approaches in passive mode, the product is already available for immediate removal, compensating for the slower sensor response and maintaining user convenience.
Solution Approach 2:
The system uses the second sensor to detect when product has been removed, which automatically triggers a mode transition back to active state. This self-service mechanism ensures the dispenser responds to actual usage without requiring active sensing during passive mode.
3Extent of automation
If the dispenser uses a first sensor and microcontroller for user detection, then automation level is improved, but device complexity increases
Solution Approach 1:
The first sensor serves multiple functions: it detects user presence for mode transition decisions, and its scan results inform the microcontroller's control logic. The same hardware component is reused for different purposes (user detection and operational state determination), reducing the need for additional specialized sensors.
Solution Approach 2:
The microcontroller continuously monitors the state of the first sensor and the second sensor, and uses this feedback to automatically adjust the operational mode. This closed-loop feedback system enables automatic adaptation to usage patterns without requiring complex manual configuration or additional control hardware.
Data Source
AI summary
A hygienic sheet material dispenser includes a housing with a dispensing opening, a compartment for a sheet material product, a first sensor arranged to assume an active mode in which it scans for the presence of a user, a dispensing motor arranged to drive a driving mechanism, a second sensor for sensing when a piece of said product has been removed, and a microcontroller connected to the first sensor, the second sensor and the dispensing motor, said dispenser also being configured to be switched to a passive mode. The dispenser is arranged to switch to the passive mode after a first predetermined period of time has elapsed in the active mode without detection of a user; wherein, upon entering the passive mode, a length of said product is fed from the dispenser out of the dispensing opening and the first sensor and the microcontroller are substantially deactivated; and wherein the dispenser is arranged to switch back to the active mode when the second sensor senses that said product has been removed.