Automotive · Strong theory
Ghost Passenger — Child/Pet Presence Detection
Knows a sleeping baby or pet is still in the parked car.
The physics is solid; our own validation is scheduled.
How it works
In a parked, locked car, nothing moves — the signal is frozen. A sleeping infant's breathing moves the chest a few millimeters, and that tiny rhythm stands out clearly against total stillness. It works in footwells and under blankets, where cameras and weight mats fail.
In the physics: Respiration displaces the chest ~5mm at 0.1-0.5Hz, modulating CSI phase on cabin multipath; heartbeat proxy at 0.8-2Hz adds a secondary band. In a static parked cabin the RF channel is otherwise frozen, so even sub-mm periodic motion produces a strong SNR deviation from the empty-cabin baseline.
See it work
This is real pipeline output for Automotive, replayed. The exact reading depends on your room.
Go deeper
How the field becomes an answer
How we prove it
Own-hardware: 2-3 ESP32 nodes in a parked car, N=10 subjects + infant mannequin with breathing simulator, blanket/footwell occlusion matrix; cross-check breathing extraction against OPERAnet respiration ground truth.
Who it is for
Euro NCAP 2025 Child Presence Detection compliance at $30/car using the WiFi chipset already in the head unit — sold to Tier-1 ADAS product managers and OEM safety leads.
runtime Runs today in LatentField 2.0 as occupancy_estimate
The matching solution
Complete first-room estimateCabin Presence Node1 nodes · ~$40 parts · 45 min Request kit, subscribe, or set up →Compatible DIY hardware options
45 min · intermediate