Depressingly stupid machine

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I have an iPaq which is docked via a USB-attached cradle. Whenever I plug
the iPaq in it syncs, which is expected. However, this also means that the
screen comes on. I'd have thought it would charge faster with the screen
off, but if I press the off button to blank the screen (after the sync has
completed), XP starts sulking about a "USB device not recognized".
Eventually XP works out that actually there is a Pocket PC there, and the
*** screen comes back on and stays illuminated for ever.

Is there a simple way to tell it that I don't need the screen lit up when I
am not using it?

Tim
 
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"Tim Anderson" <timjand@hotmail.com> wrote in news:uSf74fiqEHA.3592
@TK2MSFTNGP14.phx.gbl:

> I have an iPaq which is docked via a USB-attached cradle. Whenever I
plug
> the iPaq in it syncs, which is expected. However, this also means that
the
> screen comes on. I'd have thought it would charge faster with the
screen
> off, but if I press the off button to blank the screen (after the sync
has
> completed), XP starts sulking about a "USB device not recognized".
> Eventually XP works out that actually there is a Pocket PC there, and
the
> *** screen comes back on and stays illuminated for ever.
>
> Is there a simple way to tell it that I don't need the screen lit up
when I
> am not using it?
>
> Tim
>
>
>

not exactly, but if you press the powerbutton for abt. 3 seconds, the
backlight of your screen goes dim. Which gives you a dark screen, barely
visible, but the iPaq stays switched on.
To put the backlight on again, press the powerbutton again for abt. 3
seconds.

--
SoftSpot
softspot_ihatespam_brugge@hotmail.com
"Tomorrow it may get better, but it will never be allright."
(Cornelis Vreeswijk)

(just remove the spamstatement
and one underscore
to respond personally,
but please keep it friendly,
I'm only human too)
 
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Change the backlight settings so that it goes off after a minute so that way
u save some time. How much time i have no clue but what i will say is that
my uneducated guess says not much.

If you want to work it out however, i guess you just got to work out what 1%
of the total battery life is, then live the backlight on for the time that
it takes to use a single % and then the same with it off. bit more working
out and there you go.

hope the first bit was helpful, as for the second bit, who knows
"Tim Anderson" <timjand@hotmail.com> wrote in message
news:uSf74fiqEHA.3592@TK2MSFTNGP14.phx.gbl...
>I have an iPaq which is docked via a USB-attached cradle. Whenever I plug
>the iPaq in it syncs, which is expected. However, this also means that the
>screen comes on. I'd have thought it would charge faster with the screen
>off, but if I press the off button to blank the screen (after the sync has
>completed), XP starts sulking about a "USB device not recognized".
>Eventually XP works out that actually there is a Pocket PC there, and the
>*** screen comes back on and stays illuminated for ever.
>
> Is there a simple way to tell it that I don't need the screen lit up when
> I am not using it?
>
> Tim
>
>
 
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Tim Anderson wrote:
> I have an iPaq which is docked via a USB-attached cradle. Whenever I
> plug the iPaq in it syncs, which is expected. However, this also
> means that the screen comes on. I'd have thought it would charge
> faster with the screen off, but if I press the off button to blank
> the screen (after the sync has completed), XP starts sulking about a
> "USB device not recognized". Eventually XP works out that actually
> there is a Pocket PC there, and the *** screen comes back on and
> stays illuminated for ever.
>
> Is there a simple way to tell it that I don't need the screen lit up
> when I am not using it?
>
Other replies have covered ways to turn off the backlight, but doing so will
have no effect whatsoever on battery charging time, it doesn't work like
that.

Tony
 
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"Tony A." <you.dont@need.to.know> wrote in news:SHe8d.113$rH3.95@newsfe2-
win.ntli.net:

> Tim Anderson wrote:
>> I have an iPaq which is docked via a USB-attached cradle. Whenever I
>> plug the iPaq in it syncs, which is expected. However, this also
>> means that the screen comes on. I'd have thought it would charge
>> faster with the screen off, but if I press the off button to blank
>> the screen (after the sync has completed), XP starts sulking about a
>> "USB device not recognized". Eventually XP works out that actually
>> there is a Pocket PC there, and the *** screen comes back on and
>> stays illuminated for ever.
>>
>> Is there a simple way to tell it that I don't need the screen lit up
>> when I am not using it?
>>
> Other replies have covered ways to turn off the backlight, but doing so
will
> have no effect whatsoever on battery charging time, it doesn't work
like
> that.
>
> Tony
>
>
>

turning off the backlight will have some effect on charging time, since
backlight requires energy. And when not switched on this energy becomes
available for charging the battery. However, the time-gain will be not
really impressive, I agree with that.

--
SoftSpot
softspot_ihatespam_brugge@hotmail.com
"Tomorrow it may get better, but it will never be allright."
(Cornelis Vreeswijk)

(just remove the spamstatement
and one underscore
to respond personally,
but please keep it friendly,
I'm only human too)
 
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"SoftSpot" <softspot_ihatespam_brugge@hotmail.com> wrote in message
news:Xns9578B74C54E99softspotbruggehotmai@195.238.0.34...

> not exactly, but if you press the powerbutton for abt. 3 seconds, the
> backlight of your screen goes dim. Which gives you a dark screen, barely
> visible, but the iPaq stays switched on.
> To put the backlight on again, press the powerbutton again for abt. 3
> seconds.

Good tip, I'll try that, though I'd prefer it to dim automatically.

It's partly just annoying, I admit.

Tim
 
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SoftSpot wrote:
[...]
> turning off the backlight will have some effect on charging time,
> since backlight requires energy. And when not switched on this energy
> becomes available for charging the battery. However, the time-gain
> will be not really impressive, I agree with that.

That would be true if the charging circuitry just dumped as much current
into the battery as it could draw from the power supply, but like I said it
doesn't work that way, it isn't like filling a bucket from a tap.

In slightly simplified terms a normal lithium ion battery charging circuit
charges the battery with a specific current. The charging circuit will draw
only the current it needs to maintain that specific charging current, no
more, no less. If you were to connect it directly to a nuclear power
station, it would still draw that same current, and charge the battery at
the same rate.

Tony
 

Dave

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Exactly right Tony, Li-Ion cells for the most part are charged at a maximum
of 0.7 C ( where C= Capacity of the cell). All Ipaq chargers I have seen are
rated at 2 Amps, an Ipaq when turned on even with the screen lit only draws
about 300mAH so take that off 2 Amps and your left with 1,7 Amps available
from the PSU, even the new HX4700 only has a 1.8 Ah battery so 1.8 x 0.7 =
1.26 so you still have some spare capacity available in the charger and
quite rightly so, you shouild never really run anything at its limit.

Dave.


"Tony A." <you.dont@need.to.know> wrote in message
news:Duw8d.160$MP5.3@newsfe4-gui.ntli.net...
> SoftSpot wrote:
> [...]
>> turning off the backlight will have some effect on charging time,
>> since backlight requires energy. And when not switched on this energy
>> becomes available for charging the battery. However, the time-gain
>> will be not really impressive, I agree with that.
>
> That would be true if the charging circuitry just dumped as much current
> into the battery as it could draw from the power supply, but like I said
> it
> doesn't work that way, it isn't like filling a bucket from a tap.
>
> In slightly simplified terms a normal lithium ion battery charging circuit
> charges the battery with a specific current. The charging circuit will
> draw
> only the current it needs to maintain that specific charging current, no
> more, no less. If you were to connect it directly to a nuclear power
> station, it would still draw that same current, and charge the battery at
> the same rate.
>
> Tony
>
>
 
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Reply to message from SoftSpot <softspot_ihatespam_brugge@hotmail.com>

S> not exactly, but if you press the powerbutton for abt. 3 seconds, the
S> backlight of your screen goes dim. Which gives you a dark screen,
S> barely visible, but the iPaq stays switched on. To put the backlight on
S> again, press the powerbutton again for abt. 3 seconds.

Thanks, I forgot about that feature witn the power button. It'll save me
from having to mess with backlight settings.

JPinOH
Jon Porter <jporter@netwalk.com> Sat, 09 Oct 2004 17:40:28 -0400

=== Posted with Qusnetsoft NewsReader 2.2.0.8
 
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Dave wrote:
> Exactly right Tony, Li-Ion cells for the most part are charged at a maximum
> of 0.7 C ( where C= Capacity of the cell). All Ipaq chargers I have seen are
> rated at 2 Amps, an Ipaq when turned on even with the screen lit only draws
> about 300mAH [Snip]

True...and there's all those wonderful USB charging leads and the fact
that the USB port spec defines a max current draw of 500mA at its rated
voltage so whatever charging current a PDA uses it better not try to
pull more than that.

L3K
 
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