The evidence is proven or strong, but this capability still needs a capability-specific ESP32 or Rust runtime adapter.
Intended capability
Evaluate the sensing evidence for “Passive Sit-to-Stand Timer” in a consented study using staged events and independent reference observations. This is not a care decision, fall prediction, emergency response, or proof of resident safety.
This describes the intended outcome. Readiness is needs edge adapter, evidence is class B, and a catalog mapping or recording is not proof of this outcome at a real site.
Solution blueprint
See the environment before installing it.
This exact kit is one of 191 first-class designs. It includes geometry, objects, nodes, wording, scenarios, installation, limitations, and catalog-bound readiness.
No rendered revision is available yet.
Bundled recording
A related Elderly scene
This is one recorded vertical scenario. It is not separate validation of every capability in the catalog.
01 The physics
A chair rise is a stereotyped vertical-velocity chirp: torso accelerates upward through 0.2-0.6m/s over 1-3s, imprinting a rising Doppler sweep whose duration lengthens with lower-limb weakness — the exact observable gait-decay names for its acute end.
02 Shared processing path
Edge velocity moments (v_mean trajectory + band sweep) -> chair-rise event template (rise chirp bounded by still-sit and stand/walk) -> per-event duration + weekly distribution trend vs personal baseline.
This is a capability design path. Components may be shared with other catalog entries; it is not presented as a unique algorithm.
03 Validation plan
Instrumented-TUG literature anchors the metric; own-hardware: consented participants perform monthly clinical TUG as ground truth while daily passive rises trend in between; report correlation of passive duration vs clinical TUG time.
04 Commercial hypothesis
For the care team: 'A strength trend from every chair rise she already makes — no stopwatch, no test anxiety, no wearable.'