https://devzone.nordicsemi.com/f/nordic-q-a/62742/radio-interferenceHi, I&#39;m using an evaluation board with nRF52811 for a smart home device project, which the user can see the distance between his smartphone and the peripheral, calculated by the Tx Power and RSSI. During the connection test, we&#39;ve found many factorsen-USTelligent Community 13Thu, 18 Jun 2020 07:37:33 GMThttps://devzone.nordicsemi.com/thread/255686?ContentTypeID=1Thu, 18 Jun 2020 07:37:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b1ce1020-425b-4685-94e2-3eaee512ec1eawneil[quote userid="91272" url="~/f/nordic-q-a/62742/radio-interference"]see the distance between his smartphone and the peripheral, calculated by the Tx Power and RSSI[/quote] <p>That is <em><strong>never</strong> </em>going to give you a precise result!</p> <p>As you say, there are just far too many variables involved - most of which are outside your control.</p> <p>The best you can hope for is really just to distinguish &quot;near&quot; and &quot;far&quot;.</p> <p>This comes up frequently.</p><div style="clear:both;"></div>