Excuse me, I did not explained the scenario.
I would like counting people that cross my entrance, something like this (http://www.blueeyevideo.com/img/door-counting.png), I believe that’s easy to do with Arduino if we have the correct PIR sensor.
I just need a curtain PIR with a small angle of detection (for distinguish if there is only one person crossing the entrance or maybe two persons enter, one behind the second) we got detect this with a small angle on PIR, no problem And if the curtain PIR has a relay output we can connect it with arduino.
But, I didn’t expect the big processing delay of these PIR sensors. Now, the small angle is useless because we can’t distinguish the samples, because we are waiting 3 seconds until the relay is closed. So, I cannot distinguish if there is one entry or two.
I attached a new photo of sensor that I bought.
Do you know any curtain PIR which could be useful for this scenario? Or can I use this one? Because, I think we need samples in 500 ms or less, so the velocity of processing should be faster.
I’m motivated to do this project with arduino.