HI @athua and thanks for the info (shouldn’t this be available as regular documentation online somewhere?)
Anyway, my sensor isn’t able to detect still Targets very well. See the picture below, were someone was present all the time, but mostly sitting by a table and writing a letter at approximate distance of 3m from the sensor, facing the sensor, which is mounted on the edge of a bookshelf 1.7m off the floor with no obstacles in front of it.
As it is now, the light turned off 3 times in that short period, allthoug we were in the room. This is defintely not good enough. Please also check out this video (2) Building My Perfect Smart Home Presence Detection Sensor! - YouTube which (apart from the PIR) demonstrates how radar detector should work.