search for: tinyos clock synchronization
and see this possibly useful paper:
http://www.cs.uic.edu/~ajayk/ext/ClockSyncWSNsurvey.pdf
MS


Philip Perold wrote:
> I am currently  playing around with the routing layer on tmote sky 
> modules. In order to measure precise latency, I need some sort of 
> synchronization to take place between the pc (where the base station is 
> connected), and the other motes. At the moment I have millisecond 
> counters running on each mote. My idea is to connect all the motes to 
> the pc, simultaneously, and then reset all of them at a scheduled time 
> (the individual counters would then all be zero'd at a known time). I 
> know how to reset the motes with the embedded code (set the watchdog 
> variable), but the order needs to come from the pc. I presume it would 
> be done with some java app and the serialforwarder, or something of the 
> sort, I just don't know exactly how. Any help would be greatly appreciated.
> 
> Philip
> 
> 
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