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Thread: Ultimate control over interior lighting

  1. #21
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    Quote Originally Posted by Chris31
    Do you really think LED is bright enough to light up the whole car?

    The controller,

    Most logical way is to of course connect each LEDs to the main controller unit. As you said lots of long wires are needed.


    Ill do it something like this >>>

    Divide the RGB LEDs into 4s. The 4 RGB LEDS have a controller on board. This board consist of a PIC that drives each color of the LED directly using a PWM. The PIC outputs 4x3 software driven PWM to vary the brightnes of the LEDs. The controller uses 2 wires to comunicates to the main controller, the PC perhaps, using I2C bus.

    The controller have its own address, so you can send a command to that particular set of 4 RGB LEDS only. On top of that you have to define which of the 4 LEDs you want to change colour, then you define how much intensity you want on these RGB.

    So you send something like this >>>

    Controller ID > LED ID > RED VALUE > GREEN VALUE > BLUE VALUE

    For 20 RGB LEDs you need 5 controller of course.

    As you can see you only need 4 wires going into the PC. The power and the serial control lines can all share.

    Can be done.

    This is very similar to the way stage lighting used (They probably use much more advanced methods now). You had an 8 bit (If I remember correctly) signal which was broadcasted. First the lamp or group identifier followed by the brightness. When any light in the system needed to be changed, all of the new (updated or not) sequences were sent out.

    <Lamp_Ident> <Brightness>
    <0-255> <0-255>

  2. #22
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by vinthewrench
    try using a MAX7313 16-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection

    http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4101

    wow, and they have samples, looks like I am going to order some of those, I already have a 16f872 that is just itching to do something.
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  3. #23
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    Quote Originally Posted by big_cali_dave
    Or use the phidget led controller, I think it has those maxim chips, it offers 64 leds individually controlled and brightness on individual leds. Plus they already have libraries of code available to make it easy to program. check out www.phidgetsusa.com
    They have tons of other controllers too.


    Thats pretty nice...Anyone consider using IDE Ribbon cable for wiring?

  4. #24
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    Umm. Fiber optics? Isn't this exactly the kind of thing they were invented for?
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  5. #25
    Raw Wave shotgunefx's Avatar
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    Good luck, I've been revising mine for over a year now. It never ends

    Here's a version 2 pic,


    Version 3 is done and just waiting to install the channel controls.

    Here's some pics of the interior from v3.




    Sorry if I'm light on details, I've invested quite a bit into it. But the short version, PWM, pic based, inputs from controls,serial and some other magic.

    I used 26ga wire and molex connectors for everything on the latest version.

  6. #26
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    Quote Originally Posted by maxxell
    Umm. Fiber optics? Isn't this exactly the kind of thing they were invented for?

    I would immagine the cost would be rediculus.

  7. #27
    Raw Wave shotgunefx's Avatar
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    Quote Originally Posted by integramodder
    I would immagine the cost would be rediculus.
    I actually got some sideglow fiberoptic cable of ebay for cheap. Cool stuff, but with what most led's put out in a 5mm package, just not bright enough for my use.


  8. #28
    Maximum Bitrate kiltjim's Avatar
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    What type of prototyping board is that? It looks very close to the Stamp board.
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  9. #29
    Raw Wave shotgunefx's Avatar
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    Quote Originally Posted by kiltjim
    What type of prototyping board is that? It looks very close to the Stamp board.
    It actually is a Stamp board. I got it at RS for about $70. Unfortunately, my first projects were already above the capabilities of a stamp (Multiple PWMs,etc), so I've used it all of about 3 times.

  10. #30
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    What do you think of this: http://www.emanator.demon.co.uk/bigclive/rgb.htm
    Just make an USB or IC control for it and you can use it.

    @shotgunefx: Looks damned nice. Dou you have a schema of that? And how do you control it?

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