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Thread: Auto dimming LCD

  1. #1
    FLAC cproaudio's Avatar
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    Auto dimming LCD

    Since no one makes a VGA screen with dimmer input wire to dim the LCD when you turn on your parking lights, heres an idea for you programmers. Currently theres a program that dims the screen Brightness controller couldnt someone also write a program with resettable time to activate the dimmer program. You probably have to reset the time every few months or so. For example right now the sun sets around 7:30, you can set the time to dim your LCD screen at 7:45PM or 8:00PM. You'll have an auto dimming LCD but with no hardware installation required. just an idea
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  2. #2
    I'm sorry, and you are....? frodobaggins's Avatar
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    I might code something up
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  3. #3
    Constant Bitrate
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    i connected ground wire on inverter into stock parking light from dimming controller (ground wire with register)...
    and it works light oem screen... it gets dimmer and even i can control the brightness of screen...

  4. #4
    Constant Bitrate
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    Could you please clarify what "ground wire with register" means.

    I do unerstand ground but with register ???


    also if you give some detailed explanation on how to do this ....

    tnx

  5. #5
    Variable Bitrate
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    Interface Demo Video

    2 times setting to automatically dim at night and regular brightness during the day

  6. #6
    Constant Bitrate
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    Quote Originally Posted by skassama
    Could you please clarify what "ground wire with register" means.

    I do unerstand ground but with register ???


    also if you give some detailed explanation on how to do this ....

    tnx
    'ground wire with register' is wire from your factor dimmer controller...
    dimmer controller should have 3 wires... one is positive from parking light...
    one is ground... and one is ground out put with register that you can cotrol...
    and from lcd controller to invertor ther should 3 wires... one is 12v ingition and one is 3v trigger to turn lcd on... and one is ground...
    that ground should be disconnected then rerouted to third wire from dimmer controller above...
    i will get my digital camera back from my friend on friday...
    i will post some video how it works...

  7. #7
    Maximum Bitrate gork's Avatar
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    OK i get it, you're floating the Inverter power supply's ground to dim the screen, but doesn't the dimmer control wires voltage increase with brightness? ie the brighter your dash lights the dimmer the screen gets?
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  8. #8
    Constant Bitrate
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    Quote Originally Posted by gork
    OK i get it, you're floating the Inverter power supply's ground to dim the screen, but doesn't the dimmer control wires voltage increase with brightness? ie the brighter your dash lights the dimmer the screen gets?

    no that is the case your car controls dash light with positive wire...
    with ground wire... higher register gets dimmer output...
    so first you have make sure your car has ground type dimming controller...
    if it is not you might want to play with power line to invert instread of ground...
    but i am not sure how it would work...
    i tried only on my car which is working just fine like factory setup...
    btw nice setup... on your m3... most japanese cars are grounded type...
    i am not sure of european cars...

  9. #9
    Maximum Bitrate gork's Avatar
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    I will check again but I am pretty sure mine increases the voltage on the illum. wire relative to chassis GND.. and when illum. is off completely it's at 0V with GND..
    Man it would have been easier your way I hope I just measured incorrectly. I guess I didnt expect that behavior. I'll measure between illum and 12V battery and see what I get..

    Do you have any suggestions for how to dim the inverter if the dimmer is changing the + supply instead of floating the GND?

    Thanks a lot for the advice,
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  10. #10
    Constant Bitrate
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    Quote Originally Posted by gork
    I will check again but I am pretty sure mine increases the voltage on the illum. wire relative to chassis GND.. and when illum. is off completely it's at 0V with GND..
    Man it would have been easier your way I hope I just measured incorrectly. I guess I didnt expect that behavior. I'll measure between illum and 12V battery and see what I get..

    Do you have any suggestions for how to dim the inverter if the dimmer is changing the + supply instead of floating the GND?

    Thanks a lot for the advice,

    first with 12v positive try each wire from dimmer controller... and see if you could get controllable wire... if not yes you have to play with + supply...
    try the + wire from invertor and leave ground wire...
    try and let me know how it goes...

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