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I am just trying to detect if an object is within 7-10 feet from my phone. What device would you recommend? I don't care where it is or anything I just need a way of detecting that that device is at least 10 feet away from me...

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  • \$\begingroup\$ shopping questions are off topic. \$\endgroup\$ – Jasen Jul 28 '18 at 23:42
  • \$\begingroup\$ What if you are not carrying your phone? \$\endgroup\$ – Andy aka Jul 29 '18 at 10:17
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Bluetooth low energy seems like the best technology for that.

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