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  1. #1
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    FMC 737 annunciator LEDs

    Hi all,
    I have been busy building a basic 737 MCP. Thanks Fess and Jim --learned an awful lot from your work......
    It is all really working very well, BUT for the fact that I am now at a dead end with regards to the annunciator LEDs.

    The problem I have is in the fact that MOST Link2fs codes to be sent are "toggle" codes, meaning that the same code is used for both "on" and "off" instructions.
    ( ie , code "B04" toggles Heading Hold "on" and then again "off".)

    I am at a loss as how to switch the relevant annunciator LED, SUCH THAT IT ALWAYS STAYS IN SINC..

    Any pointers anyone?

    Thanks
    Jannie
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  2. #2
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    Re: FMC 737 annunciator LEDs

    Hi Jannie,
    Don't get confused with inputs and extractions.
    Yes an Input (switch) "B04" toggles A/P heading hold on /off, but an arduino output (led) has to be mapped to an Extraction... in this case "=j" is the 'AP heading Hold active'. Note that if you start FSX then look at L2FS extractions it will show the current values against each variable.
    So when heading hold is on =j is 1 and off =j is 0. Just map an output to follow the logic.

    Hope that helps.
    Matt

  3. #3
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    Re: FMC 737 annunciator LEDs

    Quote Originally Posted by av8vfr View Post
    Hi Jannie,
    Don't get confused with inputs and extractions.
    Yes an Input (switch) "B04" toggles A/P heading hold on /off, but an arduino output (led) has to be mapped to an Extraction... in this case "=j" is the 'AP heading Hold active'. Note that if you start FSX then look at L2FS extractions it will show the current values against each variable.
    So when heading hold is on =j is 1 and off =j is 0. Just map an output to follow the logic.

    Hope that helps.
    Matt

    Hi Matt,
    Thanks a million...I don't think I had even read half-way through your answer when the penny dropped!
    Ever thought to yourself "idiot!"?. It was one of those moments for me.

    Knowing now what to look for, I immediately found how Fess has done it, and it is all working now.

    Thanks once again for that pointer. Much appreciated.

    Best regards,
    Jannie.

  4. #4
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    Re: FMC 737 annunciator LEDs

    Jannie,

    Good to hear its working. As you may have read from some of my earlier posts, I had to utilize a second Arduino and a LUA script to get the LED annunciator states from the sim and into the Arduino MCP. Link2FS doesn't work natively with some more complex Payware planes like the MilViz 737 or the PMDG.

    ~Fess
    I will only ever be, half the Geek that I wished I was.
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  5. #5
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    Re: FMC 737 annunciator LEDs

    Hi ~Fess,
    Pleased to hear from you. I have been devouring most the threads on here, and especially yours and Jim's work.
    Thing is, I come from an electronics background, so luckily for me at least the hardware is not a biggie. I am retired (67 yo), so have time on my hands.

    I find all you guys have done here immensely interesting and it keeps the old gray matter working. I have already put together a GA radio as well.
    However, I do not plan to actually use any of it. I have no payware heavies. For me the Arduino learning experience was, and is, immensely absorbing and satisfying.

    Thanks once more for all and best regards,
    Jannie (South African)