[Tinyos-help] Ask inner resistance of Micaz motes

[Michael Schippling]

Well, you see...in a word. No.
At least I don't know of any.

But more to the point, it's a meaningless question
because the current draw, and thus "inner resistance",
varies with the functions being performed. E.g., if the
radio is transmitting, more current is being drawn (and,
according to help-list wisdom, receiving uses even more
power....which makes no sense to me, but not much does
anymore either).

If you have current measurements for the various states
you can calculate the effective resistances and then
guess how long the mote is in each state to arrive at
a total power use.

MS

ma. pratama wrote:
> yes..thats exactly what i do right now..using a small resistor and 
> measure the battery each hour..but if i could know the inner resistance 
> it should be much easier to measure the current..are there any 
> repositories that revealed the micaz resistance??
> 
> --- On *Sat, 6/6/09, Michael Schippling /<schip at santafe.edu>/* wrote:
> 
> 
>     From: Michael Schippling <schip at santafe..edu>
>     Subject: Re: [Tinyos-help] Ask inner resistance of Micaz motes
>     To: "ma. pratama" <spidol_permanen at yahoo.com>
>     Cc: tinyos-help at millennium.berkeley.edu
>     Date: Saturday, June 6, 2009, 9:33 AM
> 
>     That's a bit of a problem as the current draw changes with operation.
>     Folks have used a small resistor in series with the battery to measure
>     the current. Search this list for more info.
> 
>     MS
> 
>     ma. pratama wrote:
>      > Hi all,,,
>      >
>      > I want to measure the current after usage in the micaz motes. I
>     will using moteview to monitor the voltage in the micaz motes, so i
>     only need the inner resistance inside the micaz motes to determine
>     the current by simple formula : V =  I . R.
>      >
>      > Do anyone know how much the inner resistance of the micaz motes??
>     thanks..
>      >
>      >
>      >
>      >
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