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Thread: Fade in & out of interior lighting / dome lighting?

  1. #1
    Constant Bitrate
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    Fade in & out of interior lighting / dome lighting?

    I need 4 simple boxes of magic that'll softly dim in and out LEDs in my doors (puddle lights and warning lights).

    Anyone able to make something, link somewhere or draw something?

    Thanks!

  2. #2
    Variable Bitrate djvillar's Avatar
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    Do you want them to flash constantly or do you want them to fade on then stay on until you open the circuit again to have them fade off?

    If that's the case, you would have your 12v power source go into a resistor then a capacitor, your LED and resistor will be ran in an adjacent circuit with the capacitor.

    The first resistor will slow the power going to the led and being that the capacitor is parallel to led/other resistor, it will charge. When the circuit is turned off, the cap will continue to supply 12 volts to the 3v led... the 3volt led will continue to consume energy till all 12volts are gone... fade off.

  3. #3
    Constant Bitrate
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    Yep I want them to just fade on over about 2-3 secs, stay solid, then fade off over about 2-3 secs again... If I could make it adjustable that'd be even better!

  4. #4
    Variable Bitrate djvillar's Avatar
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    Quote Originally Posted by TheGuv View Post
    Yep I want them to just fade on over about 2-3 secs, stay solid, then fade off over about 2-3 secs again... If I could make it adjustable that'd be even better!
    The resistor inline with the LED would be used to bring down the 12v to 3v so as not to burn out the LED, but if you put an adjustable resistor before the cap... there you go. Also, putting one after the cap. you should be be to slow down the fade off more too.

  5. #5
    Raw Wave
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    Is it incandescents, or a other or a mixture like LEDs, CFLs, halogen etc?

    If NOT incandescents, the PWM is the only realistic "proportional" method.

    If incas (else halogen), there are various "analog" circuits....

  6. #6
    Constant Bitrate
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    It's puddle lights in the door cards which use 501 wedge LED or SMD bulbs.

    So if I do:

    [adjustable resistor] -- [cap] -- [fixed resistor] -- [501 LED Bulb] -- [adjustable resistor]

    I should be in business?

  7. #7
    Constant Bitrate
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    Wait- just realised! The entire reason I wanted to use Audi OEM door markers and puddle lights was so that a bulb could easily be replaced or the colour changed etc... It'll always be LED/SMD bulbs, but they come with the resistors to work off of a 12v feed in to the bulb holders... So I assume that means I just eliminate the fixed resistor from my dodgy diagram above?

  8. #8
    Variable Bitrate djvillar's Avatar
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    Quote Originally Posted by TheGuv View Post
    Wait- just realised! The entire reason I wanted to use Audi OEM door markers and puddle lights was so that a bulb could easily be replaced or the colour changed etc... It'll always be LED/SMD bulbs, but they come with the resistors to work off of a 12v feed in to the bulb holders... So I assume that means I just eliminate the fixed resistor from my dodgy diagram above?
    If the LED you buy is made for 12v feed then yes it has a resistor already and you don't need the "fixed resistor". But remember the led is in parallel or adjacent to the cap. So its: power source -- resistor -- (cap and led circuit) positives -- (cap and led circuit) negatives -- resistor.

    Bench test this. But I think this should work (at least on paper).

    Hope this helps

  9. #9
    Variable Bitrate djvillar's Avatar
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    I just bench tested this... Works great. I kind of like it. Fades in quick so you can see what you need to see but dims off slowly. Nice ambiance.



    Damn you!!! Now I'm going to have to rip my car apart and put these all over the place.

  10. #10
    Variable Bitrate djvillar's Avatar
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    Okay I need help in this now. Is there an electronic component that will gradually allow energy to flow from 0 to full potential?

    I ask because I notice that circuit I made works perfectly (fade on - fade off) but with the two resistors the LED out put is reduced. The initial resistors slows the on process but caps the potential under that of voltage for optimal brightness on the LED.

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