I would say the delay you see here has to do more with the processing going
on on each node than the time of flight for each message which at 60cm would
only take about 2ns although you're probably aware of this. I would also
say that if you are using a timer the sending time will be fairly constant
so its really and issue with the receiver. From the time a receive event is
triggered until the time you actually see the data (i.e. the time it will
take the data to be passed to the MPU and out to the USB port) is where the
delay is occuring I would think (however this is assuming you are measuring
the receive time at this point which you haven't specified). If you want it
fairly constant you would therefore need to prioritise this operation
somehow although I doubt you could get it 100% constant. I could be wrong
with all this of course but they're just my thoughts.
Regards,
Terence
Hi all,
I would like to know, if i can have an approximately constant time of flight
of an RF message between two motes. When i place two motes about 60cm apart
and send messages every 2 seconds, i discover that it takes about 2.9 ms to
leave from A to B, and later on it takes about 6.4 ms between the same
route. Does anyone know how, i can get a mote to send at a constant rate(or
rate where the times dont differ too much), or is this impossible?
Thanks
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