Mini Time of Flight Ranging Sensor High Precision Laser Distance Measurement Module for Smart Devices

The sensor emits continuous low-power radio waves and measures phase and frequency variations in the reflected signal. It is sensitive enough to pick up microscopic surface movements-such as chest movements from breathing-allowing it to confirm continuous human presence even without macro body motion.

Millimeter-wave radar signals pass easily through non-metallic, low-density materials like thin plastic housing, glass panels, and lightweight drywall. However, performance depends on proper sensitivity calibration to avoid detecting motion through thin room partitions.

Ceiling mounting provides a broad 360-degree top-down presence zone over an entire room, making it optimal for general lighting automation. Wall mounting directs the radar beam horizontally, which is better suited for headboard breathing detection, desk area monitoring, and directional entry tracking.

Because high-frequency radar detects physical displacement, high-volume airflow blowing directly against curtains, plants, or metal fan blades can produce radar reflections. Proper positioning away from direct air vents and adjusting radar sensitivity thresholds minimizes these false triggers.