which sensor i have to use to find out distance of a particular device using sensors in iot -

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i want create device tracker find objects keys or important things. want add sensor valuable thing find object left. can't use motion sensor, ultrasonic sensor or air proximity because of check distance form 1 direction. need find out distance of object direction.

consider using 1 of both:

  • gps
  • rdf (radio direction find)

the first great if have open sky , client (the looking device) able navigate through gps (thinking in smartphone).

the second indoor can hard program , find parts. soloshot. follows beacon attached person of interest. don´t have spec kind of rdf bet. airplanes use avionic based on rdf idea. read wikpeadia article on rdf.

others may come other ideas, first popped in mind.


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