RCWL‑0516 is a doppler radar microwave motion sensor module which can act as an alternative to a PIR motion sensor.
https://github.com/jdesbonnet/RCWL‑0516 
https://community.home‑assistant.io/t/custom‑sensor‑using‑nodemcu‑and‑rcwl‑0516‑solved/313635/13