We have new, innovative, Minew human occupancy sensors in stock that use millimeter wave radar sensor to detect numbers of people as opposed to just human presence. They both look similar:
The MSR01-A tracks the location (x,y,z) of individual people with a limit of 15 people. The MSR01-B provides information on the number of people entering or leaving the area.
A self-learning function detects the environment state to identify and eliminate interference sources. Statistics are provided via Bluetooth advertising, with a range of up to 150m, for detection via a gateway or app.