Sensor Lab
Local by default · feedback only by consent
ACTIVE EXPERIMENT Dead Hang Pocket · acceleration, gravity, rotation and magnetic field

POCKET SENSOR · MANUAL STOP · AUTOMATIC ANALYSIS

Measure the hang.
See the progress.

Tap Start, put your phone snugly in a pocket, and complete the full attempt. Recording continues until you tap Finish & analyse; detection only suggests boundaries afterward.

Checking motion sensor support…

  1. 1Tap startAllow motion access on iPhone
  2. 2Pocket phoneKeep it snug against your body
  3. 3Tap Finish when doneOnly you stop the recording; the full trace is saved

YOUR PROGRESS

Built from every hang

0 sessions
Personal best — Complete your first hang
Latest — No result yet
Recent average — Last five valid hangs
Total hang time — All saved sessions

Duration trend

Oldest to newest · tap a history row for sensor details

Your trend appears after two compatible sessions.

LOCAL HISTORY

Sessions

No recordings yet

Your complete recordings, manual stop points, suggested boundaries, and swing estimates stay in this browser.

FROM OBSERVATIONS TO EVIDENCE

One recorder, configurable meaning

Each experiment freezes its placement, channels, labels, and analysis profile into the session. The same timestamped trace model can describe a repetition, balance attempt, impact sequence, route, transition, or a custom observation without a capture-time activity classifier.

◎

Label after observing

Add session classes, points, and intervals without rewriting the original sensor trace. Classifiers are trained only from compatible labelled sessions.

ƒ(x)

Versioned metrics

Duration, coverage, motion, jerk, periodicity, impacts, stability, and smoothness keep algorithm and time-window provenance so results can be reproduced.

⌂

Private by default

Projects, raw traces, labels, models, and recommendations stay in IndexedDB. There is no account or analytics. Only the Dead Hang template exposes separately consented detector feedback.

SAVED ON THIS DEVICE

Hang complete

—detected dead hang
Confidence—
Stability · experimental—
Sway period—
Sway frequency—
Equivalent length—

Session

All available channels are stacked below. Drag horizontally across the graph to select the true hang. With the graph focused, arrows adjust the start; Shift + arrows adjust the end; Home/End extend to trace limits. Exact number fields remain available.

Correct detected boundaries

The graph selection is approximate. Green is start and red is end; save only if the automatic getting-on or getting-off boundary was wrong.

Labels & analysis

Comparison

Needs another compatible session.

Personal classifier

Needs labelled sessions.

Logging optimization

Needs held-out labelled evidence.

Add an annotation

    SAVED ON THIS DEVICE — NOT COUNTED AS A HANG

    No reliable hang detected

    The complete recording is preserved

    It remains in local history after this dialog closes. You can inspect every sample, correct the interval, export it, send it only with consent, or explicitly delete it.

    OPTIONAL DETECTOR FEEDBACK

    What actually happened?

    Choose a label that needs boundaries, then drag horizontally across any channel panel. With the graph focused, arrows adjust the start; Shift + arrows adjust the end; Home/End extend to trace limits. Exact number fields remain available.

    Mark the rough correct area

    Approximate times are enough. They are labels for improving the detector, not changes to your saved result.

    What leaves this browser

    The acceleration trace, available gravity, rotation, and magnetic-field channels, coarse microphone-derived dBFS levels and bounded 24-band sound-frequency heatmap when captured, sensor-source details, detector output, rough area, comments, and app build. Raw audio, waveforms, phase, and playable speech never exist in the saved or uploaded payload. No account, IP address, browser identifier, or advertising identifier is retained by the feedback service, and site-specific access logging is disabled. Feedback is kept for up to 180 days. Nothing uploads without this button.

    LOCAL EXPERIMENTS

    Choose or create an experiment

    An experiment fixes the protocol, placement, labels, enabled channels, and analysis profile saved with every recording.

    Create from a template

    Channels for new recordings

    DEVICE SETTINGS

    Measurement & data

    Storage boundary

    Sessions stay in this browser unless you export them or explicitly submit one through Detector feedback. Clearing site data or uninstalling the browser can erase local sessions, so export a backup periodically.