Home · Strong theory
Through-Wall Perimeter Curtain
It notices someone in the yard before they ever touch a door.
The physics is solid; our own validation is scheduled.
How it works
A human body is mostly water, and water soaks up WiFi. When someone crosses the invisible links between nodes — even through a wall — those links dim, one after another. The order they dim in tells you which way the person is heading.
In the physics: A human body (~60% water, eps_r~50 at 2.4/5 GHz) attenuates and scatters the RF links between mesh nodes even through drywall and brick; crossing a link changes per-link RSS/CSI attenuation, and torso motion imprints 1-3 Hz body Doppler on NLOS paths. Trajectory geometry falls directly out of which links dim in which order.
See it work
This is real pipeline output for Home, replayed. The exact reading depends on your room.
Go deeper
How the field becomes an answer
How we prove it
Through-wall LOS/NLOS AUC 0.69 already proven (class A base); extend with ESP32-wall dataset plus own-hardware yard experiment: 50 scripted approach paths vs 50 pass-by paths around an instrumented house, score trajectory classification accuracy and pre-door-contact lead time.
Who it is for
"Know someone is in the yard 20 seconds before they touch the door — no cameras, no beams, works in the dark." For gated-community security operators and smart-alarm OEMs.
runtime Runs today in LatentField 2.0 as through_wall_presence
The matching solution
Complete first-room estimateHome Presence & Intrusion2 nodes · ~$90 parts · 45 min Request kit, subscribe, or set up →Compatible DIY hardware options
45 min · intermediate
60 min · intermediate