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The LD2410B is a 24GHz mmWave radar module that senses people whether they move or sit still, which PIR sensors cannot do. It reports presence plus distance and signal strength, covers about 6 meters at ±60°, and splits its range into up to 9 gates of 0.75 m each with separate motion and stillness thresholds. Bluetooth lets you tune it from Hi-Link's HLKRadarTool app, and it plugs into the 2410 header on the Hat. It suits DIY home-automation builders who want reliable room occupancy rather than motion-triggered lights.
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Makers rate the LD2410B as a big step up from PIR for occupancy sensing, especially for still people. Complaints center on false triggers through walls and the fiddly tuning process.
The LD2410B is a human presence sensor module from Hi-Link's 24GHz millimeter wave radar series. It detects both moving and stationary people, including someone sitting still at a desk or on the couch. For each, it reports distance and signal strength.
Detection range is up to about 6 meters, with ±60° coverage. The range is divided into up to 9 configurable distance gates of 0.75 m each. Each gate has its own motion and stillness sensitivity thresholds.
Built-in Bluetooth allows optional tuning from Hi-Link's HLKRadarTool app. The module connects directly to the 2410 header on the Hat. Sensitivity, gate thresholds and presence timeouts can also be tuned within the Sat1 firmware.
