WiFi presence sensors can misread rooms after furniture moves, so recalibration matters

A WiFi presence sensor's main failure mode is often moved furniture rather than people, since it relies on a baseline of the room's radio field. Changes like a relocated bookshelf, metal cabinet, or new router alter that baseline and can cause false continuous-activity readings. The developer's approach treats large, persistent shifts as recalibration events and shows a 'no signal' state when changes are too unclear to classify. The device cannot distinguish pets or fans from people and does not coordinate across multiple units, and it is not a medical device. Its public demonstration board reports live data from an occupied flat.