[Tinyos-help] %5BTinyos-help%5D%20%3D%3Futf-8%3Fq%3FRssiDemo%3D3A_packets_are_there_but_RSSI%3D3D%3F%3D%0A%09%3D%3Futf-8%3Fq%3F0%3F%3D&In-Reply-To=

[Miklos Maroti]

Andrey,

Please use the RF230 datasheet for the exact meaning of the measured
ED_LEVEL. Minimum value is 0 = less than -91 dBm, maximum value is 84,
one unit corresponds to 1 dB, typical accuracy: +-5 dB which should be
a constant calibration error. You cannot reliably calculate the
distance from the measured RSSI values.

Miklos

On Thu, Jun 19, 2008 at 1:01 PM, Andrey Gursky <andrey.gursky at online.ua> wrote:
> Hi!
>
> Sorry, I misunderstood the meaning of RSSI values. So if I'm bringing 1 mote far away and it must increase it's transmission power to maximum, than after some distance I can't distinguish any more between distance changes, however the packets are well transmitting. It's sad that it becomes so early.
>
> Andrey
>
>
>>
>>I've tried the RssiDemo on IRIS platform. I set up the smallest transmission power in Makefile:
>>
>>PFLAGS+=-DRF230_DEF_RFPOWER=15
>>
>>If I place 2 motes very close to each other I get approximately 30 (HEX),
>> but if I place motes enough away I still can see net.tinyos.tools.Listen gets
>> packets but RSSI is 0.
>>
>>Is there something I have to pay attention (scaling?) or the RF230 chip have a small resolution
>> for RSSI values?
>>
>>Andrey
>>
>
> P.S. Sorry, if my answers are still being posted as new thread.
> I click on answer/answer all button in the web interface of my mail server,
> and I'm not changing the topic, but something goes wrong :(
> Maybe any advices?
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