Hi,
I want to build a distance measuring device with Infrared (PIR). I have bought the following sensor: http://www.miniinthebox.com/de/pir-bewegungsmelder-pir-detektor-modul_p903342.html?currency=EUR&litb_from=paid_adwords_shopping
The current status is that a LED lights up when motion is detected.
But how can I get the distance to the object?
Thank you in advance!
You don't. It can only sense movement anywhere within its field of view. It can't tell where that movement is.
With a row of these set up with limited fields of view (cardboard shutters on each one) then you could get some idea of where your movement is by looking at which sensor was triggered.
How far away (minimum and maximum) do you want to sense? An ultrasonic distance sensor might be more appropriate.
For anyone that comes across this link as I did, the answer is rather pessimistic. Proof of concept has been around for some time (https://ieeexplore.ieee.org/document/5503973/).
With a little bit of signal processing and data interpretation, one could determine speed/direction, and distance.
Cheers 