Android Question Smartphone location with WIFI strong

[pazzokli]

Hi all,
is possible calculate signal strong of wifi (connected an not) in order to understand where smartphone is located?
Not with precision, but for example router is placed at first floor, and I would know if I on the same floor of the router or not reading its signal strong
Possible?
Further I can improve precision using more wifi source

Thanks

 

[Brian Dean]

It depends what you mean by "Not with precision ...". I know that in my own house the wifi signal from the room above, through a wooden floor and plasterboard ceiling, is stronger that the signal from an adjacent room through a brick wall. Maybe the wifi in the room above is also a foot or two closer. But is this information telling you what you need to know about "where the smartphone is located".

 

[Knoppi]

i used this code in my old wifi app from 2015

Public Sub GetDistance( Level As Int, Frequency As Int) As Int
    Return Power(10, (27.55 - (20* Logarithm( Frequency, 10)) + Abs( Level)) / 20)
End Sub

 

[pazzokli]

i used this code in my old wifi app from 2015

Public Sub GetDistance( Level As Int, Frequency As Int) As Int
    Return Power(10, (27.55 - (20* Logarithm( Frequency, 10)) + Abs( Level)) / 20)
End Sub

Where do you find Level and Frequency?
Did you use a dedicated library?

 

[pazzokli]

It depends what you mean by "Not with precision ...". I know that in my own house the wifi signal from the room above, through a wooden floor and plasterboard ceiling, is stronger that the signal from an adjacent room through a brick wall. Maybe the wifi in the room above is also a foot or two closer. But is this information telling you what you need to know about "where the smartphone is located".

I need only know at witch floor I'm located, so app show me right options

 

[Knoppi]

Where do you find Level and Frequency?
Did you use a dedicated library?

The App used the old Library ABWiFi
https://www.b4x.com/android/forum/threads/wifi-library.8613/

 

[Knoppi]

the old Library ABWiFi only works up to api 28
if you want to work with api > 28 then check out this link
https://www.b4x.com/android/forum/threads/access-wifi-information.117901/
you need this

    Wait For( GetWifiInfo) Complete (WifiInfo As JavaObject)
    If WifiInfo.IsInitialized Then
        Log( "getFrequency: "& WifiInfo.RunMethod("getFrequency", Null))
        Log( "getRssi: "& WifiInfo.RunMethod("getRssi", Null))  ' is LEVEL
    End If