Yes, that is not unusual operation.
On 3/26/07, Madhu Mudigonda <[EMAIL PROTECTED]> wrote:
So, it means the fluctuations in milli-volt in the sample reading I have
given is accepatable. Is that?
Sample reading: 2989,2988,2987,2986,2989 ,2985,2989,2986,2984..
Thanks--
Madhu
On 3/26/07, Joe Polastre <[EMAIL PROTECTED]> wrote:
> Agreed with Michael; the values are consistent and only move around by
> a few millivolts even based on load, that is good. A simple LED that
> is on, as opposed to off, can affect the voltage read by the
> microcontroller.
>
> -Joe
>
> On 3/24/07, Michael Schippling <[EMAIL PROTECTED]> wrote:
> > I think tmotes have a 12 bit converter so each bit ~= 70 micro-volts.
> > There's probably more noise in the ground line than that.
> > Also the battery voltage will fluctuate a bit due to load.
> > I'm surprised the values are so consistent...
> >
> > MS
> >
> >
> > Madhu Mudigonda wrote:
> > > Hello Everybody,
> > >
> > > I'm trying to read Tmote battery voltage values through ADC. What I
have
> > > observed is, the values are very inconsistent. For example, If I run
> > > the Voltage sampling experiment, the values I'm getting are like this:
> > >
> > > Details of Experiment:
> > > I have wired to VoltageC component available inTinyOS.
> > > Sampling rate of ADC is : 1 sample/min
> > > Sample
Results:2989,2988,2987,2986,2989,2985,2989,2986,2984.............
> > >
> > > If you observe the results, after reading a battery voltage of 2986,
> > > it's shooting upto 2989. It is not consistent. Is there any correct
> > > procedure to read the Voltage(ADC) values consistently. Am I doing
correct?
> > >
> > > Any kind of suggestions or help is appreciated.
> > >
> > > Thanks--
> > > Madhu Mudigonda
> > > Research Assistant,
> > > SE-Lab,Fenn College, CSU.
> > > Ph.# 216-856-0127
> > > Fax.#: 360-233-0127
> > >
> > >
> > >
------------------------------------------------------------------------
> > >
> > > _______________________________________________
> > > Tinyos-help mailing list
> > > Tinyos-help@Millennium.Berkeley.EDU
> > >
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> > _______________________________________________
> > Tinyos-help mailing list
> > Tinyos-help@Millennium.Berkeley.EDU
> >
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> >
>
--
Madhu Mudigonda
Research Assistant,
SE-Lab,Fenn College, CSU.
Ph.# 216-856-0127
Fax.#: 360-233-0127
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