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I'm trying to calculate the distance between 2 devices using various methods with the given limitations:

  • Speed is a huge factor, therefore, authentication / handshake process is a bad idea
  • Must be valid for at least 20 meters

I've so far came with the following solutions:

  • Bluetooth - From my understanding, is going to consume most of the battery, distance is limited and authentication is mandatory(pin code)
  • Audio frequencies - I know there is a solution by google, but couldn't find anything valuable
  • Wifi - For this solution, one of the devices must be configured as a hotspot, is it possible to run a lite-weight hotspot service on both sides which would skip the authentication process, wouldn't offer any internet connection but simply broadcast its existence and signal strength
igal k
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  • Check out [Calculate distance from wifi router using signal strength](https://stackoverflow.com/questions/11217674/how-to-calculate-distance-from-wifi-router-using-signal-strength) or [Get distance between wifi access point and mobile device](https://stackoverflow.com/questions/28231999/how-to-get-distance-between-wifi-access-point-and-mobile-device) – Cabrera Nov 12 '17 at 14:35

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