On Sun, 13 Apr 2008 14:47:28 +0100 Sean Anderson <[EMAIL PROTECTED]> wrote:
> > On Sun, 2008-04-13 at 14:38 +0100, ewanm89 wrote: > > On Sat, 12 Apr 2008 02:50:11 +0200 > > "Marco Trevisan (Treviño)" <[EMAIL PROTECTED]> wrote: > > > > > Since Freerunner won't have an hardware light sensor to set its > > > LCD brightness, I got some ideas about smartly changing the > > > luminance of the GTA02 screen to save its battery (still with an > > > unknown life time :/). Of course they aren't and never will be > > > precise as an hardware sensor is, but it's the only thing we have: > > > > > > 1) Setting the brightness following the hour of the day: also if > > > the phone can't know if it's sunny or cloudy, neither if you're > > > indoor or outdoor, it's clear that just knowing the hour of the > > > day, the date and your latitude (to be set once via GPS) the > > > phone can easily know when the sun will rise and set, and so it > > > will be possible increasing or reducing the LCD brightness. > > > Also if you're indoor, I guess that when the sun is "gone" you > > > won't need so much luminance... > > > > > > 2) Using personal profiles that follow your habits: you could > > > define, for each hour of each week day the "presumed" luminance, > > > using something like a calendar. I mean, if on working-days I > > > generally stay indoor every day from 8:30 to 13:00 and from 15:00 > > > to the 19:00 I figure that on these intervals I don't need all > > > the LCD power, so I'll set in my "calendar" that on such interval > > > I'll be indoor... I guess that many of you would follow a routine > > > durning the week, why don't educate your phone for it!? > > > > > > 3) Setting the luminance following the weather. Of course I've no > > > light sensors, neither a barometer :P, but if I've a working > > > connection available I could use the weather data downloaded every > > > few minutes (60, for example) from internet to change my screen > > > brightness (of course merging these informations with points 1 > > > and 2) > > > > > > What do you think about them? > > > I do think that they are really simple to implement, and that > > > also if they won't guarantee a perferct result, they could be a > > > "smart" workaround. > > > > > > > GPS signal drops in cloudy conditions, and is usually non-existent > > indoors... this just leaves the 24hour cycle of the spin of the > > earth to worry about, all we need know is position, and rise/set > > times to sort that problem? > > > These all sound like rather extravagant power-saving means that would > be unlikely to save a great deal of power. It's maybe worth > implementing if someone has the time to add this neat little > power-saving feature, as part of power management - but it would be > my guess that more battery power could be saved by simple things like > turning off GPRS when it is not in use. > > Sean. > > > _______________________________________________ > Openmoko community mailing list > [email protected] > http://lists.openmoko.org/mailman/listinfo/community Agreed, the GPS would draw a lot of power, along with the GSM radio, bluetooth radio and wifi radio, I was only pointing out that it is technically possible with given hardware, not that it is a good idea. -- Ewan Marshall (ewanm89/Cap_J_L_Picard on irc) http://ewanm89.co.uk/ Geek by nature, Linux by choice.
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