Sounds like a good way to do things Dumitru.  I used a simular concept 
except via hald duplex RS485 serial communictions with some machines to a 
PC. master.       The master would poll each slave, the slave would respound 
with it's current status.  Included in the current status was a flag to 
indicate that the slave had collected a complete log record and was ready to 
send it to the master.  The flag was a number representing the log 
information's position in a circular buffer.  When the master would receive 
a current status with such a flag, it would then request that log record 
from the slave (the
----- Original Message ----- 
From: "Dumitru Stama" <list@mirosat.com>
To: <piclist@mit.edu>
Sent: Saturday, February 11, 2006 11:02 AM
Subject: [EE] Anticollision algorithm


>
> Hello guys,
> I want to implement a few wireless sensors in my home and i was
> thinking about using nordic-based modules like the ones sold on
> sparkfun.com. My question is how can i implement a working
> anti-collision communication between the sensors and base station ?
> If three sensors broadcast at the same time then i might have a
> problem. I was thinking about a token sent by the base station to one
> sensor after which it waits a period of time for the feedback and then
> move to the next sensor and so on. Is this a good way of doing things?
> I can also detect if on sensor has been disabled very easy and maybe
> (if it is a security system) to issue some warnings if the problem
> is still there after a few minutes or a few unsuccessful tries.
>
> Dumitru Stama
>
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