When are we getting dimming from 12v switched?

**ik632** · 02-13-2009, 03:03 PM

I've been wondering this for a while now. I really want the LCD to dim automatically when it gets a 12v signal from the dimmer control in the car. Every aftermarket stereo I've had does this and will dim the screen and turn on lighting for the other controls. I know it sounds like something simple and I've been using the skin switching to handle this, but I'd also like the added benefit of reducing the backlight or otherwise dimming when the head lights or parking lights are turned on.

**zeecue** · 02-14-2009, 12:19 PM

Cant you couple the dimmer control wire to a fusion brain, and let fusion brain change skin or skin color and light for you?
Because it has both inputs and outputs.
So just 1 input from the dimmer wire, 1 output to the led in the screen, and then just code it?

Best Regards
Morten

**ik632** · 02-14-2009, 04:06 PM

That would probably work. Changing skins would work or I could use it to change monitor gamma or maybe even digital brightness (through the graphics card settings). The settings on the monitor (EBY701 here) are digital and I'm not sure how to send the signal to the monitor via the FB. I supposed you could setup something to send the IR signals and turn the brightness up and down on the 12v signal. It would be best if the monitor had a variable resistor for the brightness control because that could be directly connected to the FB.

**zeecue** · 02-14-2009, 04:44 PM

Dont your screen have a auto light dimmer?
If it does, then you can solder 2 wires to the light sensor to your Fusion Brain
If it just have 1 button, with lets say 3 modes, like my Linitx does, then solder 2 wires to the button, and to fusion brain, and let the fusion brain, function like the button, so if the fusion brain get lets say only 8 volt on the dimmer wire, then it would "press" the screen dimmer button lets say 2 times.

Best Regards
Morten

**2k1Toaster** · 02-14-2009, 05:00 PM

Software gamma control is the way to go.

Have a photosensor into a Fusion Brain and it will monitor the light. Average it over some period so it isnt constantly adjusting it every time you go under a streetlight or overpass by using a history value. Then have that output to your frontend like RR to control the gamma.

**ik632** · 02-16-2009, 11:36 AM

I guess I should get my FB so I can get started on the light control, steering wheel control, and I'm sure I can find other things for it to do

I'm using CF so I should check to see if there's a shortcut key for the gamma button that's on screen. Thanks for the tip.

Hopefully the screen manufacturers are out there listening though so it's an even easier install in the future.