FA-93724 / Solar tracker geometry / Member archive

Anemometer fail-safe stow voting: missing value filter · case 04

A dead-calm reading of 0 m/s is treated as a missing sensor and forces a stow.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

readings are [value or None, age_s] per anemometer. A reading is valid when value is not None and age <= max_age. Fewer than n_required valid readings: ['stow', 'sensor', None]. Otherwise use the highest valid value: >= stow_at gives ['stow', 'wind', v], else ['track', 'ok', v].

Why this case matters

Single-axis and dual-axis solar trackers turn a sun direction into actuator commands; a sign, frame or limit mistake points a whole plant away from the sun or into a mechanical stop.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
boundary: calm zero reading	`["stow", "sensor", null]`	`["track", "ok", 0]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.