STEM与日常科技·英语30篇（2）
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Common Sensor Types Inside Smart Home Devices
智能家居设备中常见的传感器类型
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Motion sensors use passive infrared (PIR) to detect body heat changes when someone walks across a room.
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Door and window contact sensors contain magnetic switches that trigger alerts when gaps open unexpectedly.
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Temperature and humidity sensors combine capacitive and thermistor elements for precise indoor climate tracking.
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Smoke and carbon monoxide detectors rely on electrochemical cells or optical chambers to sense dangerous particles.
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Light sensors measure ambient lux levels and automatically adjust smart bulbs or blinds accordingly.
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Microphones in voice assistants use beamforming arrays to isolate speech from background noise clearly.
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Water leak sensors use conductive pads that close a circuit when moisture bridges two electrodes.
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Air quality monitors often integrate PM2.5, VOC, and CO₂ sensors to assess indoor health risks.
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Pressure sensors in smart mattresses track breathing and movement during sleep for wellness reports.
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Each sensor type feeds specific, reliable data to the home hub without unnecessary complexity.