Can I use V53L5CX to detect the number of people in a small area like 2m x 2m? If so, how many people can I detect? Can I detect 4 people within 2m x 2m? The sensor will be mounted on top of a door entrance.

[John E KVAM]

draw a 45 degree pyramid starting at the sensor. It shows the area of coverage.

If your door entrance were 2m tall, the area of coverage would be about 2m x 2m.

But at the very edges, it would see only the people's feet. To get full coverage, you would probably need a couple of them. Granted the wall edges would be seen, but you can account for that in software.

If your door were 3 meters tall, the area of coverage would probably work out better.

But I'm going to guess that you are going to have a hard time telling the difference between 2 people standing close, and one big fat guy.

But It would be a fun experiment. Buy the $56 P-nucleo-53L5A1 and try it. A long USB cable and some tape would be all it took. And a couple of friends to walk under the sensor.

• john