STEM与日常科技·英语30篇（2）

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智能家居设备中常见的传感器类型

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