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* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> 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
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