Smart-Home Hazard Detector With Pre-Alarm and Easing Feedback
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Solution Overview
Problem
Conventional smoke or carbon monoxide alarms provide no indication of a hazardous condition until a loud alarm sounds, which can be annoying and does not inform users if remediation actions are effectively addressing the issue, as they typically only have binary states (alarm on or off).
Innovation Solution
A hazard detector system that monitors hazardous conditions and provides auditory and visual indications not only when a condition is present but also when it is easing, using multiple states (non-alarm, pre-alarm, and alarm) and outputting messages and lights to inform users of the status, with adjustable threshold durations based on factors like humidity and the type of hazard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional alarm sounds only when hazard reaches threshold level, then false alarms from minor hazards (e.g., cooking smoke) are avoided, but users receive no early warning and cannot take preventive actions
Solution Approach 1:
The system performs preliminary action by issuing a pre-alarm notification when the hazard level approaches but has not yet reached the alarm threshold. This early warning allows users to take remedial actions (such as opening windows or turning on ventilation) before the full alarm sounds, thus preventing false alarms while providing timely response opportunity
Solution Approach 2:
The alarm response is segmented into multiple stages: a pre-alarm stage with visual/audible notifications when hazard approaches threshold, and a full alarm stage when threshold is exceeded. This segmentation allows differentiated responses based on hazard severity, providing early warning without triggering unnecessary full alarms
2Device complexity
If alarm provides only binary state (on/off), then device complexity is minimized, but users lack information about whether remediation actions are effective
Solution Approach 1:
The system implements feedback by continuously monitoring hazard levels and providing real-time visual indicators (LED lights) that show whether the hazard is present, easing, or has cleared. This feedback loop informs users about the effectiveness of their remediation actions without requiring complex additional components
Solution Approach 2:
The system uses color changes in LED indicators to convey different hazard states: red light indicates hazard present, green light indicates hazard cleared. This simple visual coding system provides rich information about hazard status while maintaining device simplicity
3Reliability
If alarm sounds immediately when threshold is reached, then safety response is maximized, but user annoyance from minor hazards increases
Solution Approach 1:
The system applies preliminary anti-action by providing a pre-alarm warning that enables users to counteract the developing hazard before it reaches alarm levels. For minor hazards like cooking smoke, users can take corrective actions (ventilation, stopping cooking temporarily) during the pre-alarm phase, preventing the full alarm from activating and thus avoiding annoyance
Data Source
AI summary
Ambient amount of a hazardous condition may be monitored. A mode may be set to a state indicative of the hazardous condition being present in the ambient environment. It may then be determined that the amount of the hazard in the ambient environment has dropped below a threshold hazardous condition level. A time period may then be tracked during which the amount of the hazardous condition present in the ambient environment of the hazard detector has remained below the threshold hazardous condition level. It may be determined that the time period has reached at least a threshold duration, during such time period the amount of the hazardous condition present in the ambient environment of the hazard detector having remained below the threshold hazardous condition level. An indication of the hazardous condition easing may be output in response to the time period being at least the threshold duration.