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Threshold Metal Screen
The doorway notices a big hidden metal object walking in.
Plausible physics, early work — shown honestly as an experiment.
How it works
Metal reflects WiFi far more strongly than a human body does. A person carrying a crowbar or a long blade adds a glint to the signal that a body alone cannot make. It is a caution flag, not an airport scanner — it raises the risk score of that entry so the rest of the system pays attention.
In the physics: Metal is a near-perfect scatterer (sigma -> infinity) with radar cross-section far exceeding tissue per unit area; a 60 cm steel bar carried against a body adds specular returns and polarization/multipath changes that a body-only crossing does not produce. The residual between the observed field and the reconstructed 'human-only' field carries the conductor's signature.
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
Own-hardware portal rig: 6-node doorway mesh, 15 subjects x {nothing, laptop, frying pan, crowbar, mock long-arm} x 20 crossings, report detection AUC vs conductor size and body-position; no suitable public dataset exists.
Who it is for
"The front door that whispers 'he's carrying something long and metal' to your monitoring center." For gated-community guardhouses and high-end residential security integrators.
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