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Colour changer.

Discussion in 'Lighting' started by Clive Mitchell, May 30, 2005.

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  1. I just thought I'd mention that I finally got my act together and
    completed the full version of my stand alone PIC based colour changer.
    For code security I've made the full feature version available on
    pre-programmed chips.

    You can find the updated project at:-

    Or just go via

    I have to say that I'm well chuffed at the end result. Despite
    generating the PWM control signal in machine code as opposed to a
    dedicated CPU module, it still achieves a very respectable 350Hz rate
    which is absolutely flicker free.

    I've also divided the programs into two categories. Architectural for
    the posh slinky colour changing effects, and FX for the more psychedelic
    options. The chip can be switched between the two modes using the
    standard two control buttons which have to be held in together for 15
    seconds to avoid accidental mode switching.

    The chip stores all appropriate settings to non volatile memory about 15
    seconds after you've stopped playing with the buttons, so it always
    boots up in the last stored effect.

    Oh yeah, and for the theatre dudes and Halloween lovers I put in a
    program that turns the unit into a three channel flame simulator for
    candle and lantern effects.
  2. DJ Solomon

    DJ Solomon Guest

    Excellent RGB PWM Project...

    We are working on a DMX version using the 16F chip - care to collaborate???
    Our plan is to offer both the end product, the chip and the code Open


    Dennis J. Solomon
    Inventor/Patentor (Altman Star Series - band PHISH lights)
  3. DJ Solomon

    DJ Solomon Guest

    and remember to annoint George Mueller with Sir William Bell's wands...

    FFT PS
    PWM -)(-)
  4. Yeah. Note my contribution to the alliance. The core RGB PWM routines
    in my software were written early October 1996 before CK started
    patenting wheels.
    And that's the boring old obsolete version. :)

    I'll get you a new chip over shortly Adam.
  5. I specifically avoided the implementation of a communication protocol to
    keep things simple and make the unit more versatile. While the latter
    comment may sound like a contradiction, it relates to the fact that the
    unit produces it's sophisticated effects internally, and therefore can
    be used as a fit-and-forget architectural controller.

    As I'm sure many of you have seen, DMX is often abused in architectural
    installations. Here's are some of the common reasons:-

    1. There was no time left at the end of the job to program it properly.
    2. The architect "designed" the program.
    3. Nobody knew how to program the thing properly.
    4. It was programmed but crashed.
    5. A cleaner turned it off and it didn't start again.
    6. Someone pressed a button and it stopped working.
    7. One of the guys had a go at reprogramming it.
    8. The programmer was expensive so we just got them to do three steps.
    9. Someone stole the little show-control box thing.
    10. None of our maintenance staff know how it works.

    This invariably results in 10's of thousands of pounds of state of the
    art lighting doing a very simple, repetitive pattern, or worse still
    being left off completely.
  6. Chewy

    Chewy Guest

    Yes, your RGB fading leds are great.

    It would be better with DMX.

    I've been trying to build a dmx to stepper motor driver for ages, I've got
    the stepper motors working fine but its the dmx is the problem for me. I'm
    not a great software writer.
    I have some old Pan Cans I want to control.

  7. Chewy

    Chewy Guest

    Well they can't be too bad because Rosco brought out a almost the same thing
    with their Icue.
    And I would like to build the same.

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