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3.9k-Star Wi-Fi Human Sensing Open Hardware

ESPectre: open-source Wi-Fi CSI radar spots motion, falls & pets—no cameras, $20 ESP32, Home Assistant ready.

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Meng Li
Dec 23, 2025
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In smart home systems, there are several needs that still lack ideal solutions:

  • Home Security: Receive instant alerts when someone enters your home while you’re away in “away mode.”

  • Elderly Care: Monitor daily activity patterns to detect falls or prolonged periods of inactivity.

  • Smart Automation: Achieve “lights on/heating on when people arrive” – activate devices only when presence is detected.

  • Energy Savings: Automatically identify vacant rooms and turn off appliances to avoid wasted electricity.

  • Child Monitoring: Receive automatic alerts if a child leaves their room late at night.

  • Precise Climate Control: Provide cooling or heating only in areas with active occupancy.

Installing cameras at home always feels a bit odd – like having countless eyes watching you.

Moreover, cameras have limitations in functionality or come with high costs.

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