[Tinyos-help] tmote clock skew

[Eric Decker]

I beleive this conversation was in the context of stand-alone.  There are
protocols that do a distributed clock adjust.  They don't require a trusted
clock source.
Se FTSP.

eric


On Fri, Jul 17, 2009 at 6:59 PM, Raffaele Gravina <
raffaele.gravina at gmail.com> wrote:

> Well... i believe it's about time synchronization, isn't it? You need a
> "trusted" source of clocking in order to correct your drift. Am i wrong?
>
> raf
>
> 2009/7/17 Eric Decker <cire831 at gmail.com>
>
>> on the telosb it is done once on boot and then not done again.
>> in other words it is something you have to figure out how to provide.
>>  Most of the pieces are in the code.
>>
>> eric
>>
>> On Fri, Jul 17, 2009 at 4:03 PM, Raffaele Gravina <
>> raffaele.gravina at gmail.com> wrote:
>>
>>> Which is the easiest way to correct it? Does TinyOS provide with a
>>> specific api/component or is something one would do by himself?
>>> - Raf
>>>
>>> 2009/7/17 Michael Schippling <schip at santafe.edu>
>>>
>>> One would have to look at the specs for the crystal used
>>>> but something like .1% (or less) sticks in mind. Whatever
>>>> it is, it seems small but actually leads to significant drift
>>>> if not frequently corrected.
>>>>
>>>> MS
>>>>
>>>> Yi-Tao Wang wrote:
>>>> > Hi,
>>>> >
>>>> > Does anyone know the clock skew I can expect from a tmote sky?
>>>> >
>>>> > Thanks,
>>>> >
>>>> > David
>>>> > _______________________________________________
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>>>> >
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>>
>>
>>
>>  --
>> Eric B. Decker
>> Senior (over 50 :-) Researcher
>> Autonomous Systems Lab
>> Jack Baskin School of Engineering
>> UCSC
>>
>>
>
>
> --
> Raffaele Gravina | Research Engineer
>
> Wireless Sensor Networks Lab Berkeley
> 2000 Hearst Ave, suite 304
> Berkeley, CA 94709
> +1 510 666 0174 ext. 101
>



-- 
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
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