LED Stage Light Capable of Control via DMX512

Discussion in 'The Projects Forum' started by Anna1, Nov 23, 2012.

  1. Anna1

    Thread Starter New Member

    Nov 23, 2012
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    I'm having a problem with this circuit. I am trying to get an LED wash light circuit to be remote controlled via DMX512. The problem is, after I found the circuit for the RS485 (which will deliver the DMX signal to my LED circuit) my professor told me that there's no time to make it and that I should just buy it. I couldn't find a descent one to buy. I am also not sure if I should connect the LEDs with parallels or using a darlington pair? ! I have attached the circuitry for the RS485. Also, the options I have to connect the LEDs, not even sure which Microcontroller is the best for them. Any help? It's also 5 - 9 LEDs.
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    I really need the help on the best method to design the LED circuit, since my previous one was rejected by my advisor. Also, can I please get a website link that I can buy a read RS485 from? :) any help with the LED circuit would be appreciated.

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    Last edited: Nov 23, 2012
  2. bertus

    Administrator

    Apr 5, 2008
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  3. JDT

    Well-Known Member

    Feb 12, 2009
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    If you want to make something, I would suggest a PIC. Code to receive DMX can be found here:-
    http://www.qsl.net/n5tle/dmx2avc.asm
    You could adapt this code.

    Couple the DMX (which is RS485) to the PIC like this:-
    http://www.qsl.net/n5tle/dmx2avc.pdf
    Look at the connections around IC2.

    I would control the brightness of the LEDs using PWM. Fairly easy to do in PIC software. Some PICs have a limited number of PWM peripherals built in.

    The simple way to drive the LED would be a logic-level MOSFET and a series current limiting resistor to control LED current.
     
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  4. Anna1

    Thread Starter New Member

    Nov 23, 2012
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    Bertus, Yes I got it from there. Unfortunately I was asked not to do it, and to buy a ready RS485 (do you have any idea where to buy a good one?). I have looked at the bottom of whereas the 3 circuits, I just couldn't figure which was suited until I first find the new RS458 I'm about to buy. Thank you for your help.

    JDT , I will defiantly have a look at those sites. I really appreciate your help. Thanks a million.
     
    Last edited: Nov 23, 2012
  5. bertus

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    Apr 5, 2008
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  6. tubeguy

    Well-Known Member

    Nov 3, 2012
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