Doppler Radar - How It Works (English Caption)

See how this small doppler radar works, and how it may replace an "old fashioned" PIR detector.

Diagram and pinout: https://www.elecrow.com/rcwl-0516-microwave-radar-sensor-switch-module-body-induction-module-4-28v-100ma.html

The patent on the principle of operation: https://patents.google.com/patent/EP3091605A1/en