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  1. #1
    500+ This must be a daytime job Boeing 747 Flyer's Avatar
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    Extremely Confused - Matrix Wiring

    Hello everyone,

    I am very sorry to have to post this again after I thought I had understood it previously.

    Basically, I am stuck on how to do the Matrix wiring. I have looked at the diagrams that Twisted8 provided on the last topic, but still I cannot understand the whole nature of everything.

    I think probably that the only way I'll understand all this is if I can obtain a diagram of the Matrix wiring of the whole CDU with two-terminal legs (kind of like Twisted8's diagram of his MCDU but he used 4 terminal legs), and then saying which wire goes to which pin etc.

    Please note I am building a 767 CDU for use with Lekseecon, and the Opencockpits USBKeys Card.

    If anyone can advise that is great, I thought I understood this but sadly not.

    Thanks alot,

    Jack

  2. #2
    2000+ Poster - Never Leaves the Sim kiek's Avatar
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    Re: Extremely Confused - Matrix Wiring

    What is your problem Jack? What information do you miss in the Opencockpits USB Keys ManualManual?

    The USB keys card supports a 11 x 8 matrix, so you may connect 88 push buttons.... More then sufficient for the 69 buttons of the FMC.
    It really does not matter where you connect a button.
    After you have wired them all, just run IOCKeys.exe and write down the code for each button.
    These codes you need in the SIOC script.
    Hope this make things more clear.

    Nico

    P.S. This wiring issues has nothing to do with lekseecon. I'll delete this thread in a few days.
    Last edited by kiek; 05-01-2010 at 04:34 PM.

  3. #3
    500+ This must be a daytime job



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    Re: Extremely Confused - Matrix Wiring

    Hi Jack,
    Let me say this, on the USBkeys card you have J3 a 40 pin connector.These are labeled according to the Manual as pins 1-8 and form one part of the matrix. The second part of the matrix consists of Pins 26-36 of J3.To connect a switch and have it be read one terminal of the switch must be connected
    to any pin numbers 1-8.The other leg of the switch must be connected to any Pin numbered 26-36(A-K).The usbkeys card can read 88 keys.Thsi is achieved
    because with the matrix having 11 pins(J3 A-K) and another group 8 pins( J3 1-, so 8 x 11 =88.
    To summarize in your case,
    Take pin 1(J3) and connect this to one side of each of 11 of you switches,ie daisy chain each switch.
    Take Pin 26 and connect it to one side of a free switch.
    Take pin 27 and connect it to another free switch.
    Carry on in this manner till all of your 11 switches are connected.
    Ive attached a pic showing only 6 columns and 6 rows, just continue on in the same manner till pin 8 and pin 26 on J3 are connected like those shown.
    As can be seen from the diagram when one column and one row are connected by a pushed switch the it is read by the USBkey card.This card has 88 unique row and column connections enabling this card to read 88 push button keys.
    Hope this helps,i suggest u get you card and connect a switch between J3 pin 1 and 26 and see what happens,then everything will become clearer.
    Les

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  5. #4
    500+ This must be a daytime job Boeing 747 Flyer's Avatar
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    Re: Extremely Confused - Matrix Wiring

    Thank you for the diagram, it has helped.

    The thing I don't understand is, is how the wiring is actually implemented into the CDU. I will try and post a diagram proposing what I think the wiring should look like.

    Thanks for your helpful assistance,

    Jack

  6. #5
    500+ This must be a daytime job Boeing 747 Flyer's Avatar
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    Re: Extremely Confused - Matrix Wiring

    Okay guys, I have made a very quick drawing in paint. On the following diagram, the multi-coloured wires are the vertical common wires, and the grey wires are the horizontal common wires. Please correct me if I've gone wrong:


  7. #6
    2000+ Poster - Never Leaves the Sim kiek's Avatar
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    Re: Extremely Confused - Matrix Wiring

    No, this is not right Jack, sorry.

    You are using 14! horizontral wires, and the red and light yellow wires try to connect 14/13! switches.
    You should organize it such that you have a matrix of 11 x 8 . Don't pay too much attention to the physical position of the button at the cdu, just place them in a 11 x 8 matrix ...

    Remove LSK1, LSK2 and LSK3 from the red wire and connect these to the blue (or pink, or...) wire (vertically) and to the grey horizontal wires of LSK4, LSK5, and LSK6 (and RSK4, RSK5, and RSK6).
    Remove RSK1, RSK2, RSK3 from the light yellow wire and connect these to the purple (or yellow, or brown, or..) wire (vertically) and to the grey grey horizontal wires of LSK4, LSK5, and LSK6 (and RSK4, RSK5, and RSK6).


    Nico
    Last edited by kiek; 05-02-2010 at 05:07 AM.

  8. #7
    500+ This must be a daytime job Boeing 747 Flyer's Avatar
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    Re: Extremely Confused - Matrix Wiring

    Okay, I have had a go at just the vertical wiring.



    Is this okay for the vertical wiring? I't sht horizontal I can't do now.

  9. #8
    300+ Forum Addict Steve A's Avatar
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    Re: Extremely Confused - Matrix Wiring

    This might help you understand how a matrix works, I found it helped me, its for the axis card but very simple pictures, I was lost too till i saw this
    http://users.skynet.be/jcordon/cockpit/electronique.htm

  10. #9
    500+ This must be a daytime job Boeing 747 Flyer's Avatar
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    Re: Extremely Confused - Matrix Wiring

    Thanks Steve for the diagram, unfortunately I'm still lost.

    I udnerstand how the Matrix works, and how to wire it, I just don't know how to actually implement this into a CDU because the layout is so different. If someone could whip up a 5 minute drawing on paint that would be great (kind of like the one I did... But correct!).

    I am very sorry if the answer is staring me in the face, but I have never wired in Matrix before, thus leading to my confusion.

    Htanks alot,

    Jack

  11. #10
    2000+ Poster - Never Leaves the Sim kiek's Avatar
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    Re: Extremely Confused - Matrix Wiring

    Quote Originally Posted by Boeing 747 Flyer View Post
    Is this okay for the vertical wiring? I't sht horizontal I can't do now.
    Like I said, there are several possible solutions, this is one of them...
    You are now using 10 "vertical" wires.
    Baring in mind that the USB Keys matrix supports 11x 8 you can use up to 8 horizontal wires, which is just sufficient.
    The first horizontal wire should start at LSK6, via dot, 0, +/-, Z, blank, DEL, CLR, to RSK6.
    and so on...
    The 7th horizontal wire should start at FIX, via LEGS.... to EXEC.
    The 8th horizontal wire goes from INIT REF to VNAV.


    Nico
    Last edited by kiek; 05-02-2010 at 06:04 AM.

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