24GHz Millimeter Wave Radar PIR Motion Monitoring Module, LD116

A traditional PIR sensor detects motion by sensing changes in infrared heat, which means it can misfire on sudden temperature shifts and generally can't see through anything solid. This LD116 module takes a different approach, bouncing 24GHz radio waves off anything moving nearby, which lets it detect presence and motion more reliably and even through light materials like thin walls or curtains, all while staying small and low-power enough to drop into the same kind of projects a PIR sensor would normally handle.