Auto Dimmer

efun · 05-03-2009, 10:08 AM

How to auto adjust the brightness of the screen? Is there a hardware sensor to do this? if so, a plugin can be developed to make DIMMER auto control based on the value received from the sensor.

carputer1 · 05-03-2009, 11:49 AM

mitch has made a dimmer type app within RR its self, have a look at your documentation in the rr folder, it may not be exactly what your after but as an alternative

efun · 05-03-2009, 09:10 PM

Quote: Originally Posted by carputer1

mitch has made a dimmer type app within RR its self, have a look at your documentation in the rr folder, it may not be exactly what your after but as an alternative

It is a good alternative. but I think a ambient light sensor will give more automatic control.

sxtnitehawk · 05-04-2009, 07:05 PM

use a Fusion Brain with a photosensor and the RRFusion plugin

using the reading from the photosensor, you can automate the dimmer value.

Sonicxtacy02 · 05-05-2009, 09:28 AM

Quote: Originally Posted by sxtnitehawk

use a Fusion Brain with a photosensor and the RRFusion plugin

using the reading from the photosensor, you can automate the dimmer value.

This is what i do. Course i wrote RRFusion so i'm a bit bias lol

sxtnitehawk · 05-07-2009, 08:48 AM

efun, BlueZX3's plugin RRExtended now has a command in it that I've needed to create a true autodimmer. as soon as I have the code down, I'll post it here for you... You'll have to play with some of the numbers, but itll get you started. You'll need a Fusion Brain with a photosensor, but trust me, YOU WANT IT...the Fusion Brain will open up totally new doors you never knew existed

sxtnitehawk · 05-07-2009, 09:15 PM

Here's a 17 step autodimmer using the FB photosensor with RRFusion. if you have a definite port for the photosensor, you can change $IN1PORT$ to whatever port number the photosensor is on... so it reads for example... ANALOG0RAW

Code:

"AUTODIM","BYVAR;AUTODIMMER;<<SETVARBYCODE;PSENSOR1;ANALOG$IN1PORT$RAW||DRANGE1"
"DRANGE1","BYRANGE;$PSENSOR1$;964;1024;DIMMER;0<<DRANGE2"
"DRANGE2","BYRANGE;$PSENSOR1$;904;963;DIMMER;10<<DRANGE3"
"DRANGE3","BYRANGE;$PSENSOR1$;844;903;DIMMER;15<<DRANGE4"
"DRANGE4","BYRANGE;$PSENSOR1$;784;843;DIMMER;20<<DRANGE5"
"DRANGE5","BYRANGE;$PSENSOR1$;724;783;DIMMER;25<<DRANGE6"
"DRANGE6","BYRANGE;$PSENSOR1$;664;723;DIMMER;30<<DRANGE7"
"DRANGE7","BYRANGE;$PSENSOR1$;604;663;DIMMER;35<<DRANGE8"
"DRANGE8","BYRANGE;$PSENSOR1$;544;603;DIMMER;40<<DRANGE9"
"DRANGE9","BYRANGE;$PSENSOR1$;484;543;DIMMER;45<<DRANGE10"
"DRANGE10","BYRANGE;$PSENSOR1$;424;483;DIMMER;50<<DRANGE11"
"DRANGE11","BYRANGE;$PSENSOR1$;364;423;DIMMER;55<<DRANGE12"
"DRANGE12","BYRANGE;$PSENSOR1$;304;363;DIMMER;60<<DRANGE13"
"DRANGE13","BYRANGE;$PSENSOR1$;244;303;DIMMER;65<<DRANGE14"
"DRANGE14","BYRANGE;$PSENSOR1$;184;243;DIMMER;70<<DRANGE15"
"DRANGE15","BYRANGE;$PSENSOR1$;104;183;DIMMER;75<<DRANGE16"
"DRANGE16","BYRANGE;$PSENSOR1$;44;103;DIMMER;80<<DRANGE17"
"DRANGE17","BYRANGE;$PSENSOR1$;0;43;DIMMER;85<<"

mpr90 · 05-08-2009, 12:09 AM

I may be mistaken (apologies if so), but aren't all these solutions adjusting the brightness of the video output from the PC? I have been trying to dream up a way to auto-adjust the LCD screen backlight brightness so that I can dim it down at night. Otherwise, at night, even the black levels are too bright for my night driving eyes. Has anyone figured out how to interface the PC to control the LCD backlight?

What I ended up doing in the interim was adding a skin function to turn off the VGA output from the PC, which (after a few seconds) causes the monitor to auto power off. However, the touch screen is still active (powered from USB) so I can just touch the screen to wake up the PC.

Blue ZX3 · 05-08-2009, 12:20 AM

That is a HW hack, not saying it can't be done...just that these SW approches are just easier, but def not better then what your asking bout.

sxtnitehawk · 05-08-2009, 12:17 PM

i agree, controlling the actual backlight would be better, but definitely a lot more complicated because not all screens work the same. especially when you get into LED backlit screens...now to create a better contrast ratio, they can force the led backlight to dim in different areas to make dark colors darker and light colors lighter...dont know if that's made it's way to the small VGA market yet, but i know it has on larger TV's...

For now, the internal DIMMER system is the best you're gonna get unless you custom hack your hardware, which could get mighty expensive with trial and error

efun · 05-11-2009, 01:05 AM

Quote: Originally Posted by sxtnitehawk

Here's a 17 step autodimmer using the FB photosensor with RRFusion. if you have a definite port for the photosensor, you can change $IN1PORT$ to whatever port number the photosensor is on... so it reads for example... ANALOG0RAW

sxtnitehawk, thanks for your code. I will try this solution.

efun · 05-11-2009, 01:09 AM

Hope touchscreen manufactory can produce a product which allow software to control the backlight. I think the techique should be ready for this. For example, I used the thinkpad. I can use hotkey "Fn+Home or End" to adjust the brightness.

efun · 05-23-2009, 12:59 AM

I found a perfect solution. My car has a light sensor in the mirror, so I can set the dimmer based on the sensor value.

sxtnitehawk · 05-23-2009, 06:45 PM

as long as that sensor puts out a 0-5v signal you can, yeah

kuo · 05-29-2009, 11:56 AM

i have my xenarc's brightness control wire hooked to my car's dimmer knob to automatically dim my backlight when the headlights come on. the wiring diagram is somewhere on this forum. the only issue with this approach is my car's dimmer knob goes from 0 volts at maximum brightness to 12 volts at the minimum brightness while the xenarc goes from 0 volts at max to 3.5 volts at min. when turn the knob too low, the xenarc backlight shuts off and i have to power cycle it to get the backlight back on. i'm sure there's a way to drop the output voltage of the dimmer knob but with resistors or something of the sort but i'm not quite sure how to do it.

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