FA-67838 / Elevator dispatch scheduling / Member archive

Encoder position and door zone detection: millimetre rounding · case 03

Positions just short of the zone edge are rounded into it.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Car position is tracked in micrometres: start_mm*1000, pulses add count*um_per_pulse, a door-zone magnet at floor k resets the position to floor_mm[k]*1000. After every event the position in mm is floor(um/1000); the car is at the nearest floor (ties to the lower index) if within zone_mm inclusive, otherwise None (between floors).

Why this case matters

Lift group controllers make these decisions many times per minute; a wrong answer strands passengers, wastes trips or overrides a safety rule.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: six-tenths of a millimetre short of the zone	`[1, 1]`	`[null, 1]`	Failed

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