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Subject: Re: something about battery level + remaining time estimation
From: TP Diffenbach (rockbox_at_diffenbach.org)
Date: 2003-05-03


Uew,

the FM does exhibit the behavior described. Or at least mine does also. ;-)

I don't take it as a bug, as I assumed it was estimated from a (changing) voltage, and that this wasn't as visible on the Archos software because the Archos using a much smaller granularity with a range of only five or so values (empty, 25%, 50%, 75%, full. If that much less precise estimate is desired on the Rockbox, one needs only to set battery display to graphic.

I suspect the other posters realize this as well, and are just providing feedback on the behavior they see.

Is it possible that the estimation could be improved by employing a moving average of the last n estimations? Or is this already being done?

Quoting Uwe Freese <mail_at_uwe-freese.de>:

> Hello,
>
> It often happens here that people are irritated if the battery level
> that Rockbox displays changes.
>
> I'm asking myself why people can't accept that this is only an
> estimation, calculated from the voltage (which really is going up and
> down quickly when hdd goes on/off etc.). I cannot go and ask the
> battery "How full are you right now?".
>
> The point that the estimated value is shown exactly doesn't mean that
> the estimation is exact. And it will never be exact. But I don't think
> that we shouldn't only show "battery full", "battery 50%", "battery
> empty" or show a remaining time with an accuracy of only an hour.
>
> So, if someone knows how to improve the estimation (especially for the
> FM), read the docs and the code, improve the code and send a patch to
> the patch tracker. If not, don't be so irritated that the values shown
> are going up and down sometimes.
>
> P.S.: Sorry if I misinterpreted mails and the irritation is because of
> a strange behaviour on the FM that is really a bug or something. I
> don't have an FM, so I can't test it.
>
> Bye, Uwe.
>
>

-- 
Archos FM needs a Rockbox!



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