[Tinyos-help] the actual data rate of micaz & telosb

[Michael Schippling]

Well, my stuff was driven from the PC under Java so the timer rez
is 10ms (or worse...I think I measured 10 once anyway), I think I
said that someplace in the report. And I was just using what's there
codewise. Given that I want to use multiple asynchronous nodes, CSMA
is pretty much necessary.

I _should_ try it without the PC, being as the UART may be a bottleneck
for micaz...but...I probably won't. I'm still a little surprised that
there isn't a cohesive testing program for this.

Hint: It would make a good senior project...
MS



Tie Luo wrote:
> Thanks MIchael.
> I have read your experiment report.  According to my experiments, I got 
> much less msg loss and lower delay.  But I modified the lower-layer 
> tinyos code a bit.  I did not do rigorous tests and not record the 
> data.  There are still two parameters that our experiments cannot give 
> good answer:
> 1. data rate (your tests indicated an even lower rate than mine since 
> CSMA-CA was involved)
> 2. timer accuracy: I used to set 1-3ms between successive msgs, and I am 
> not confident with the micaz timers when the timing interval is very short.
> 
> Tie
>  
> On 11/6/06, *Michael Schippling* <schip at santafe.edu 
> <mailto:schip at santafe.edu>> wrote:
> 
>     I did some mica2,z testing last year:
>         http://www.etantdonnes.com/Motes/report_micaz/
>     <http://www.etantdonnes.com/Motes/report_micaz/>
>     but have recently been made aware that I may have been
>     UART speed limited when doing the 'Z tests.
>     MS
> 
>     Tie Luo wrote:
>      > micaz and telosb use CC2420 as their transceiver, and in cc2420 data
>      > sheet the data rate is said to be 250kbps.
>      > I did a measurement and found the rate was much lower; less than
>     150kbps.
>      > Who else also did such measurements? Would like to hear your results.
>      >
>      > p.s. the accuracy of timer is also involved, but not sure how
>     accurate a
>      > millisec timer is. would like to hear comments.
>      >
>      > --
>      > Regards,
>      > Tie
>      >
>      >
>      >
>     ------------------------------------------------------------------------
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> 
> 
> 
> -- 
> Regards,
> Tie