Smart Thermostat Presence Sensing for Responsive Low-Power Interface
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Solution Overview
Problem
Smart thermostats face challenges in accurately assessing occupancy and providing a user-friendly interface, as they require more information about the environment and user presence to optimize energy efficiency and comfort while maintaining advanced functionalities.
Innovation Solution
A smart thermostat with a user interface that has two operating modes, utilizing proximity sensors with multiple channels to detect user presence and motion signatures, allowing the system to transition between modes based on user interaction, and enabling energy-saving features like auto-away mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user interface is activated continuously to provide advanced functionalities and respond to user inputs, then the user interaction capability is improved, but the energy consumption increases
Solution Approach 1:
The proximity sensor detects user presence in advance before the user actually interacts with the thermostat. The system preliminarily determines that user interaction is likely and activates the user interface accordingly, so the interface is ready when the user arrives, avoiding continuous activation while ensuring readiness.
Solution Approach 2:
The system continuously monitors proximity sensor data to detect when a user approaches or leaves. Based on this feedback, the user interface dynamically transitions between active and sleep modes, optimizing energy consumption while maintaining user interaction capability when needed.
2Use of energy by moving object
If the user interface enters sleep mode to conserve energy when no user is present, then the energy consumption is reduced, but the response time to user interaction increases
Solution Approach 1:
The proximity sensor performs preliminary detection of user presence before the user reaches the thermostat. When presence is detected, the system proactively activates the user interface in advance, ensuring immediate responsiveness when the user arrives, thus avoiding delays that would occur with simple on-demand activation.
3Measurement precision
If multiple proximity sensors with multiple channels are used to accurately detect user presence and motion signatures, then the occupancy detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The proximity sensing system is divided into multiple independent channels (first proximity sensor with first channel, second proximity sensor with second channel, etc.). Each channel independently monitors a specific directional sector. This segmentation allows the system to achieve comprehensive 360-degree coverage and accurate motion signature detection while maintaining modular simplicity in each individual sensor channel.
Solution Approach 2:
Each proximity sensor channel serves multiple functions: detecting user presence, determining directional approach (left, right, front, back), and generating motion signatures. This multi-functionality reduces the need for separate specialized sensors for each detection task, thereby managing overall system complexity while achieving high occupancy detection accuracy.
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 enhances user interaction by activating the interface only when needed, conserving energy and improving comfort by accurately detecting user presence and intent, thereby optimizing HVAC system operation.
Implementation Method 1
a first proximity sensor configured to detect a user presence within a first range
Implementation Method 2
a second proximity sensor configured to detect a user presence within a second range, the second range being greater than the first range
Data Source
AI summary
A smart-home device may include a user interface having a first operating mode and a second operating mode, and a four-channel thermopile. A processing system may be programmed to receive an indication of a user presence near the smart-home device from the thermopile, and determine a motion signature based on the responses from the thermopile. The processing system may also be programmed to process the determined motion signature to determine the presence of a condition warranting user interface entry into the first mode from the second mode, and cause the user interface to transition from the first mode to the second mode based on the determined motion signature.