The HLK-LD2410C module is a human presence, distance and motion detection sensor using 24GHz millimeter wave radar. The boards I found are so small (22mm wide by 16mm high) that I wondered if I could add one to a wifi smart plug. That turned out to be easy, follow along for step by step instructions.
Continue reading Adding LD2410 Motion Sensor to Sonoff S26 Smart Plug running ESPHome