Thermostat Proximity Profiles for C-Wire-Free Display Activation
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Solution Overview
Problem
Existing thermostats face challenges in providing advanced functionalities like powerful microprocessors and wireless communications while maintaining a visually appealing display, being compatible with homes lacking a 'C' wire, and allowing for easy DIY installation without the need for a power brick, which is both convenient and aesthetically pleasing.
Innovation Solution
A thermostat with a processing system and user interface that includes an electronic display with active and inactive modes, using power stealing or rechargeable batteries to operate without a 'C' wire, and incorporating sensors to detect user proximity for intelligent power management, allowing the display to switch between modes based on user interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power stealing method is used to operate thermostat without C wire, then ease of installation is improved, but power availability for advanced features deteriorates
Solution Approach 1:
The thermostat dynamically adjusts display operation modes based on detected user presence. When a user is detected via sensors (proximity, motion, ambient light), the display transitions to active mode with full functionality. When no user is present, the display enters inactive mode with reduced power consumption, allowing the system to operate successfully with power stealing without requiring C wire installation.
Solution Approach 2:
The system changes operational parameters (display brightness, refresh rate, processor activity) based on power availability and user presence conditions. This allows the thermostat to provide advanced features when needed while maintaining compatibility with power-constrained installations that use power stealing methods.
2Ease of operation
If display operates in active mode continuously, then user interface quality is improved, but power consumption increases
Solution Approach 1:
Instead of continuous operation, the display operates periodically based on user presence detection. The system uses sensors to detect when a user approaches and activates the display only during these periods. This periodic activation maintains high user interface quality when needed while dramatically reducing average power consumption to levels compatible with power stealing operation.
Solution Approach 2:
The display provides full functionality and quality (excessive action) during active periods when users are present, but operates minimally or not at all during inactive periods. This partial operation strategy ensures excellent user experience during interaction while keeping overall power consumption within available limits.
Data Source
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AI summary
A thermostat includes a user interface that is configured to operate in at least two different modes including a first mode and a second mode. The user interface may require more power when operating in the first mode than in the second mode. The thermostat also includes a plurality of sensors, including at least one sensor configured to detect a presence of a user within a proximity of the thermostat. The thermostat additionally includes a first processing function that is configured to determine a proximity profile and to cause the user interface to be in the first mode one or more sensors provides responses that match the proximity profile. The proximity profile may be computed using a history of responses from the sensors that are likely to coincide with times where users intend to view the user interface.