OmniPreSense has released a new update to its API which now allows you to count how many objects have passed a fixed space in front of the sensor. The radar detects objects either based on speed (OPS241-A, OPS242-A, OPS243-A) or range (OPS241-B). Using filter settings, a detection region can be defined with minimum and maximum speeds or ranges.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/blog/show/simple-people-counter-using-radar