Dear Jobish Jhon and Alexander.
Thanks a lot for all advices. Currently are worked fine, and the best is
the fact that I know the calculus is very trustworthy (accurate information
Jobish Jhon).
Finally the file RssiDemo.java is now:
...
int source = message.getSerialPacket().get_header_src();
double rssi = msg.get_rssi()-45;
System.out.println("Rssi Message received from node " + source +
": Rssi = " + rssi + " " + "dBm");
}
...
And mantaining the two TelosB motes very, very close (touching its
antennas) I've obtained:
Rssi Message received from node 1: Rssi = -4.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -4.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Rssi Message received from node 1: Rssi = -3.0 dBm
Thanks a lot again!!
Alex CP
CUC
On Sat, May 9, 2015 at 2:14 AM, JOBISH JOHN <jobishjohn.m...@gmail.com>
wrote:
> Hi Alex,
>
> The datasheet (Page No: 11) of CC2420 says “ The range for RSSI is
> approximately from –100 dBm to 0 dBm “. Page No: 49 of CC2420 datasheet
> talks about substracting the offset value, -45 to get the dBm equivalent.
> Page No: 10 of datasheet talks about the Receiver Sensitivity (Typ: -95
> dBm).
>
> Your previous readings shows approx. 0 dBm (when both the motes placed
> very close)
>
> Try to increase the distance between the motes. When they get
> disconnected, the Rssi Message received on your PC will be close to -50 (
> so that -50 -45 = -95dBm) ( I am getting this value).
>
> Thus I believe subtracting -45 is enough.
>
> Thanks
>
> Jobish John
>
>
>
>
>
> On Sat, May 9, 2015 at 10:37 AM, Alex Cp <cpa9...@gmail.com> wrote:
>
>> Hi all.
>>
>> Im trying to convert in dBm the values obtained from the app:
>>
>> <http://tinyos.stanford.edu/tinyos-wiki/index.php/Rssi_Demo>
>>
>> In my case appears the next values:
>>
>> Rssi Message received from node 1: Rssi = 40
>> Rssi Message received from node 1: Rssi = 41
>> Rssi Message received from node 1: Rssi = 40
>> Rssi Message received from node 1: Rssi = 40
>> Rssi Message received from node 1: Rssi = 41
>>
>> Because is very close both motes TelosB (Sending Mote and Rssi Base )
>>
>> In the TinyOS tutorial appears the next: "...that this app prints only
>> the raw RSSI values ..."
>>
>> On the other hand I have the Data sheet of the RF Transceiver CC2420:
>>
>> <http://web.stanford.edu/class/cs244e/papers/cc2420.pdf>
>>
>> But is not clear to me How I can do the conversion from raw RSSI to dBm.
>>
>>
>> I read, someone in the TinyOS mail-list, who wrote that is only necessary
>> substract -45:
>>
>> <
>> https://www.millennium.berkeley.edu/pipermail/tinyos-help/2014-March/058162.html
>> >
>>
>> But I suppose is not a exact calculation.
>>
>> I'll be grateful if somebody can generously explain how is the correct
>> way to convert raw RSSI values from a TelosB to a dBm.
>>
>> Thanks in advance.
>>
>> Alex.
>>
>>
>> Date: Mon, 3 Mar 2014 12:13:27 +0530
>> From: ashok <ashok256...@gmail.com>
>> Subject: [Tinyos-help] RSSI DEMO
>> To: tinyos-help@millennium.berkeley.edu
>> Message-ID:
>> <CAKs3p-d4GxW_dJjVc9Hwmk-+X_ZKi+hnvzCr+C2TS2NkuKg4uA@mail.
>> gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Dear All,
>>
>> I am getting RSSI value in tinyos like:
>>
>> Rssi Message received from node 1: Rssi = -14
>> Rssi Message received from node 1: Rssi = -1
>> Rssi Message received from node 1: Rssi = 2
>> Rssi Message received from node 1: Rssi = -2
>> Rssi Message received from node 1: Rssi = 2
>> Rssi Message received from node 1: Rssi = 0
>> Rssi Message received from node 1: Rssi = -2
>> Rssi Message received from node 1: Rssi = 2
>> Rssi Message received from node 1: Rssi = 2
>>
>> and I want to conform that is this value is in Dbm?
>>
>> if not than how can i convert it?
>>
>> regards,
>>
>> -ashok
>>
>> _______________________________________________
>> Tinyos-help mailing list
>> Tinyos-help@millennium.berkeley.edu
>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>
>
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