Sure -- I could see a solution where you use some method to synchronize all motes to a common time base (perhaps using any of the proposed radio time sync protocols) and then you use USB to transmit messages of the form: at time X do Y,where time X is sufficiently far in the future.
Rob On 8/24/06, Jose L. Ponce <[EMAIL PROTECTED]> wrote:
2006/8/24, Robert Szewczyk <[EMAIL PROTECTED]>: > > > But this would also mean that it is not possible to send a message to > > _all_ motes simultaneously, right? This would be a big problem... > That's correct. Simultaneous transmission to all motes over usb would > be difficult over a point to point link such as USB . USB host > schedules transmissions to individual endpoints on a 1 ms granularity, > and depending on the precise timing of requests you may observe as > much as 2 ms between requests. It sounds like if you want motes to > receive a message simultaneously, a radio broadcast channel may be > appropriate. Mmmm... Perhaps a better solution would be to use both USB and radio... I have used SerialForwarder Multiplexer but I am not getting very good results and I am thinking that using multiple instances of SerialForwarder and mapping might be more work but in the end the computer-mote communication should be more reliable this way... - J.
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