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I have a toy car and I want to measure the coordinates/location of that car in my house.

It need to bee high precision equipment so GPS won't work here.

My precision requriments is 5+- cm and the distance is like 10-20 meters as maximum raduis.

What module should I use then?

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    you could mount cameras to the walls and track the object optically
    – jsotola
    Dec 21 '20 at 3:22
  • @jsotola that won't work for me. It need to be very like GPS, but local.
    – MrYui
    Dec 21 '20 at 10:28
  • While there certainly are systems, that work like a local GPS, they will be very expensive and most likely not easy to use. Honestly I wouldn't know, where I would be able to source such a system. Please explain more about the requirements. Why won't cameras work for you?
    – chrisl
    Dec 21 '20 at 13:52
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    there is no "module" you can use. Heck, there's not really anything you can use with an Arduino. There's a few systems that do things like this, though not to that level of precision, and those are lab-based proof of concepts more than working systems. Ultrasonic triangulation might be your best bet fi you can lower the precision requirements a notch or two, but even that's complex AF.
    – dandavis
    Dec 21 '20 at 21:35
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    @chrisl I don't know my setup or requriments, except it need be small, have 4 wheels and have a precision about 5+- cm. That's all I need.
    – MrYui
    Dec 21 '20 at 22:07

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