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Thread: DMX8 DCSSR Project

  1. #1
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    Default DMX8 DCSSR Project

    Here's another project I've been recently working on.

    It's an 8 channel DMX controlled DC SSR that I designed specifically for my LED Portafloods, but has enough current capability to drive higher DC loads, such as LED MR16's.

    The design is 12 or 24 volt capable without any modification, due the the fact that I use the LM2575 switching voltage regulator, and the design can be used for 12 to up to 48 volts by using the high voltage variant of the regulator (LM2575HVT-5.0) and a higher voltage rated input filter capacitor.
    This part is a little harder to get and a costs much more than a linear regulator, but it works very well in this application and doesn't generate a lot of heat like a linear regulator would.

    The firmware is based on my previous DMX designs, modified for DC use with PWM output (at about 250Hz), and uses the "switchless" method for setting the DMX start channel address.

    I've sized the board to be mounted in either the Keptel CG-1000 or CG-1500 enclosures, so I can mount my power supply in the same enclosure. The board measures 4.8 X 3.3 inches.

    I've ordered some prototype PC boards and as always, if there's any interest a co-op can be done.

    Project files with source code attached. Schematics and boards layout were done in Eagle.

    Here's the Mouser web BOM http://www.mouser.com/ProjectManager...sID=0ef1780636


    Robert
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    Last edited by RPM; 11-04-2009 at 02:19 AM. Reason: Added PCB pictures

  2. #2
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    Default Re: DMX8 DCSSR Project

    Dang - needed this about 2 months ago before I built up my Ren16/DCSSR setup... oh well...

    Very nice project there Robert!
    Brian

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  3. #3
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    Default Re: DMX8 DCSSR Project

    Quote Originally Posted by budude View Post
    Very nice project there Robert!
    Yep. I agree, another great design. Good to see the variety on this site.

    Cheers
    Matthew
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  4. #4
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    Default Re: DMX8 DCSSR Project

    Dang! I need *nine* more DC channels ...

    But I'd buy a board (or a board/chip if that's the way you want to go) for future expansion ...

    Good work -- as always.

    \dmc
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  5. #5
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    Default Re: DMX8 DCSSR Project

    RPM -

    I am not the best at reading schematics - what is the voltage out on the DMX8 DCSSR board.

  6. #6
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    Default Re: DMX8 DCSSR Project

    Quote Originally Posted by covewi View Post
    RPM -

    I am not the best at reading schematics - what is the voltage out on the DMX8 DCSSR board.
    The way the board works is you need to supply power to the board from an external 12 or 24 VDC power supply and then conenct your LED's to the output terminals. The output voltage here is the same as what you feed into the input terminals, and the board electronics are powered from this same DC source.

    Robert

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    Default Re: DMX8 DCSSR Project

    Robert,

    I'd be interested in a few of these. I'll keep checking to see if a group buy / coop takes shape. It's a good blend of channel count and DMX.

    Alan T

  8. #8
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    Default Re: DMX8 DCSSR Project

    I see mention of PWM - does this thing dim the attached LEDs?

    Mike

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    Default Re: DMX8 DCSSR Project

    Quote Originally Posted by ncc1701mda View Post
    I see mention of PWM - does this thing dim the attached LEDs?

    Mike
    Yes, it does. Basically, PWM (Pulse Width Modulation) varies the amount of time that current flows to the LEDs which gives them a dimming effect.

    It can be better described here http://en.wikipedia.org/wiki/Pulse-width_modulation

    Robert

  10. #10
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    Default Re: DMX8 DCSSR Project

    BTW - PWM works well with LEDs (and other lights for that matter ) due to another phenomenon known as Persistence of Vision.

    While the Light is turned On and Off very quickly, your eyes can't distinguish the off time.


    Cheers
    Matt
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