How do you count people in/out ?

[Jean-Philippe Encausse]

Hello,

How do you count people if they are In and Out with a single sensor ?
https://www.youtube.com/watch?v=xULR1e4NWso

How do you track multiple people at the same time ?

Thanks !

[Bud Ryerson]

You can tell whether a person is coming In or Out by measuring whether an object is moving away from the sensor or toward it.

I believe it's impossible to track multiple people with a single sensor.