alt Hacker News> What is the resolution? Can I track my cat through the house? See when they go to the feeder? Count my own bathroom visits?
None of the above.
The setup process has you select 3 reference devices. You should pick the devices so that your normal motion areas are between the device and the router.
The router then watches the WiFi signals from those devices. If they fluctuate more than baseline, it's assumed that something is moving around in the area.
It's a threshold detection that can serve as a crude motion sensor for home/away purposes.
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Nuts. Less interesting than the claims of monitoring heart rate, but still potentially some applications “for free” if it just needs to analyze signal strength from devices I already have. Theoretically could put it directly onto my OpenWRT router and make it available from there.
For home / away purposes it's easier to just detect if your phone is connected to the network. I built something like that before by shipping the log from my UniFi controller to a RPi and listen for events where my phone's MAC address connect or disconnnect.