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 community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
