Long-range presence (C4001)JSON
No C4001 data yet.
Arrive = present ≥1 s, depart = absent ≥5 s (debounced on the sensor). The C4001 reports range and speed of the strongest mover but no angle, so it is drawn as an arc across its 100° beam.
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Rings at 6 / 13 / 20 / 26 ft · spec: ranging ±0.5 ft, resolution approx 2.5 ft, angle accuracy coarse (see guide).