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Automatic backlight adjustment

 
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Geir_Andersen
Occasional Visitor


Joined: Nov 18, 2004
Posts: 6
Location: Sweden

PostPosted: Thu Nov 18, 2004 10:37 pm    Post subject: Automatic backlight adjustment Reply with quote

I will soon release a application that will adjust the backlight brightness,
depending on the sunrise/sunset at a specific location.
This utility is most useful especially when the device is mounted in the car
for navigation, handsfree etc.
When its getting dark, the brightness is automatically decreasing gradually,
and increasing when its getting lighter.
this will enhance the security wile driving, because you will not be
distracted by the bright backlight, and you don't have to fiddle with the
backlight adjustments while driving!
The application will be available in English and Swedish languages.
The application have so far been tested on Compaq iPaq 3870, 3970, 5450 and Qtek 2020.
I am interested in getting suggestions and comments for this application!

Here a short description and screenshots of the settings for the application:


General
==========
Activate adjustment of backlight when program starts

Activated

Even set on battery power
When checked backlight will be adjusted on both battery and external power

Lowest Backlight Setting
The highest and lowest numbers for the backlight adjustments varies for
different device models.
Adjust the backlight to the lowest setting possible (without turning
backlight off) and click the Get button.

Highest Backlight setting
The highest possible setting for the backlight brightness.
Adjust the backlight to the highestsetting possible and click the
Get button.


Day
===========
Adjust the slider to the highest desired brightness.
Sunrise Offset
Sets the backlight at the brightest setting in minutes offset from the sunrise
time (the time is shown below the setting according to the current sunrise time).
Keep Setting
Determines how long the brightest setting will be kept in minutes after the above
setting (the setting the time is shown below the setting according to the current
sunrise time).


Night
===========
Adjust the slider to the lowest desired brightness.
Sunset Offset
Sets the backlight at the lowest setting in minutes offset from the sunset time
(the time is shown below the setting according to the current sunset time).
Keep Setting
Determines how long the lowest setting will be kept in minutes after the above
setting (the setting the time is shown below the setting according to the
current sunset time).


Location
===============
Lat
Latitude in degrees, minutes and seconds

Long
Longitude in degrees, minutes and seconds

Sunrise / Sunset
Displays the current sunrise and sunset times according to the Latitude / longitude
setting.

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lbendlin
Pocket GPS Staff
Pocket GPS Staff


Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA

PostPosted: Fri Nov 19, 2004 5:03 am    Post subject: Reply with quote

You may want to think about an alternative approach. Most of the times lighting conditions change frequently, you may have dark days, and you may have well lit car cabins at night (just to make the point). Of course the ideal solution would be to use the built in ambient light sensors of the old iPAQs...

Maybe it's more helpful to be able to toggle the brightness between a number of settings (two to five) with the press of an assignable hardware button?
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Geir_Andersen
Occasional Visitor


Joined: Nov 18, 2004
Posts: 6
Location: Sweden

PostPosted: Mon Nov 22, 2004 12:47 pm    Post subject: Reply with quote

lbendlin wrote:
You may want to think about an alternative approach. Most of the times lighting conditions change frequently, you may have dark days, and you may have well lit car cabins at night (just to make the point). Of course the ideal solution would be to use the built in ambient light sensors of the old iPAQs...
Maybe it's more helpful to be able to toggle the brightness between a number of settings (two to five) with the press of an assignable hardware button?


There will be varying light conditions, but the application would adjust the backlight just fine for an average light condition according to the sunrise / sunset, and changing the adjustment is very easy. The application runs in the background, and the settings is accessible from the tray menu on the Today screen.
Often when I drive home from work, the backlight adjustment is already at its darkest setting(!). But when driving through the town there is quite much light from the streets. Its not a problem though, the sceen is fully readable, even if its a little dark. Better a little bit dark then being blended and distracted by the screen!

The problem with the automatic backlight adjustment on the iPaq is that it works only when battery powered! Would have been useful if it worked on AC power..

The application will soon be finished. I'll let you know, and maybe you could review it?
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pletharoe
Occasional Visitor


Joined: Jan 19, 2005
Posts: 13

PostPosted: Mon Jan 24, 2005 10:29 am    Post subject: Reply with quote

The most useful feature I can think of would be to have an option for it to automatically launch when TomTom starts.
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