Hi all,
Thanks for your prompt replies. Unfortunately I that link didn't let me through.
In fact I am still trying to undestand them, as I wasn't aware of that
limitation of 33-50ms of the Mica2's! You are saying that the maximum bandwidth
my app should require is 0-25Hz so that I have a nice reconstruction of my
wave, due to HW limitations?
I knew that the CC1000 has a maximum bandwidth of 76.8kbps and of course due to
EEPROM readings/writings, CPU instructions, ADC's measurements etc. this number
should decrease. But I wasn't expecting a final bandwidth of 30pckts/s!!! In
fact, I thought there were problems related to the TOSBase.
My app requirement need at least 100Hz (Mica2's transmission needed thus 200
pckts/s), which is necessary to track a complete gait cycle using acc and gyros
with good definition.
What is the most critical factor in the Mica2's that blow the transmission rate
so bad? Does this happen with the Mica2Dot too? Data compression (sample with a
higher freq, store in the RAM and then send the whole bunch of bytes) has a
limitation of 29 bytes due to TinyOS, correct?
Thanks guys for the good info.
Cheers,
Edgar Charry> Date: Mon, 14 Apr 2008 12:20:38 -0600> From: [EMAIL PROTECTED]>
To: [EMAIL PROTECTED]> CC: [email protected]> Subject: Re:
[Tinyos-help] Pumping up bandwidth - Mica2Dot/Mica2> > Well, since people are
quoting my second source messages, have a look at:>
http://www.etantdonnes.com/Motes/report_mica2/> (which seems to be down right
now but will hopefully be back soon...).> > However my message
speed/reliability measurements use only the standard> GenericComm and TOS1
code. I think the OP was trying to fiddle timeouts> and backoffs to speed
things up further. Data mining of the help list> should turn up some more
useful advice in this respect.> > MS> > Eric Keller wrote:> > There is a limit
to how many packets you can send with a mica2 which you are> > at or above. You
probably want to lower your bandwidth requirements somehow.> > See this
message:> >
https://www.millennium.berkeley.edu/pipermail/tinyos-help/2008-April/032464.html>
> > > Eric> > > > > > On Mon, Apr 14, 2008 at 4:59 AM, Edgar Charry <[EMAIL
PROTECTED]> wrote:> >> Hi all,> >>> >> I am trying to pump my packet
transmission up between a Mica2Dot and a> >> Mica2 to at least 200Hz
[pckts/s].> >>> >> I've decreased the timer constant to a bottleneck of 33ms
(30 pckts/s) that> >> pratically executes a round of ADC measurements and send
the packet.> >> Decreasing from this point doesn't give me more bandwidth.
However, my> >> packet is 14bytes long (the TinyOS header + just a couple of
adc> >> measurements + CRC).> >>> >> I suspect that this 33ms (parsed time
stamps from XSniffer) are limited to> >> the TOSBase.nc on the Mica2. I suspect
that the PLL of the Mica2 is> >> listening through channels and is not locked
to the transmitter's one. Every> >> loop thus should take 33ms.> >>> >>
Actually, I haven't been through the CC1000 conf/mod components though, but> >>
I reckon with your experience this can be solved easily.> >> Cheers,> >> Edgar
Charry> >>> >> ________________________________> >> Explore the seven wonders
of the world Learn more!> >> _______________________________________________>
>> Tinyos-help mailing list> >> [email protected]> >>
https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help> >>> >
_______________________________________________> > Tinyos-help mailing list> >
[email protected]> >
https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help> > --
> Platform: WinXP/Cygwin> TinyOS version: 1.x, Boomerang> Programmer: MIB510>
Device(s): Mica2, MicaZ, Tmote> Sensor board: homebrew> >
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