[Tinyos-help] Ask inner resistance of Micaz motes

[João Carlos Giacom in]

Read the paper,

Remaining Capacity Measurement and Analysis of Alkaline Batteries for Wireless Sensor Nodes
Adriano B. da Cunha, Breno R. de Almeida, and Diógenes C. da Silva, Jr., Member, IEEE
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 58, NO. 6, JUNE 2009

***************** 
 João Giacomin 
 Prof-DCC-UFLA 
*****************

---------- Original Message -----------
From: Michael Schippling <schip at santafe.edu> 
To: "ma. pratama" <spidol_permanen at yahoo.com> 
Cc: Tinyos-Help <tinyos-help at Millennium.Berkeley.EDU> 
Sent: Sat, 06 Jun 2009 13:05:47 -0600 
Subject: Re: [Tinyos-help] Ask inner resistance of Micaz motes

> 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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