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Thread: Buttons on my dash to turn on my car amplifiers

  1. #1
    Newbie ATT41's Avatar
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    Buttons on my dash to turn on my car amplifiers

    Ok, so I am using the FB at the moment to trigger outputs (relays) for my amplifiers.

    I want to use a spare switch in my car's dash to do the same thing (as if I were clicking the button on the screen to turn on/off an output).

    The switch in my dash seems to only complete the circuit when the button is being pressed, once I stop pushing down the button, the circuit it broken.

    So I want MDX to change the output status as if the button is like a "down click vote" and not change until the next "down click vote"

    Hope this makes sense.
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  2. #2
    Maximum Bitrate Crinos's Avatar
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    Not quite sure of what you are trying to do here...

    Just to clearify...
    You want a hardware button, to do the same task as a software button via FusionBrain does?

    If so the case, you need a button that sends a puls signal while beeing pressed. then a system that register the puls, and have a memory of on/off state, and out of that a logic that sends a solid 12V to amp if "on" and cut the signal if "off".

    Now.. This might seem a bit more complicated than it realy is... There are some stores where you can buy a logic relay that can do this task for you.

    How this will work togeather with FusionBrain... I have NO clue off..

  3. #3
    Newbie ATT41's Avatar
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    hmmm... not quite.

    I think what I am trying to say is, I want an output to be triggered by an input.

    Once the input is active (lets say 12v) the FB will trigger an output.
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  4. #4
    Newbie ATT41's Avatar
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    OK, I think I am getting somewhere now,

    using a new root function that will trigger a predefined output if a certain input is greater than 5v (I now realise you can have a input with 12v)

    gotta play around with it a bit though.
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  5. #5
    Fusion Brain Creator
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    Quote Originally Posted by ATT41 View Post
    (I now realise you can have a input with 12v)
    do not do this. 5v is the max.

  6. #6
    Newbie ATT41's Avatar
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    oh ****, I meant to say can't,

    but it appears I have found a way to do it. I'm going to have an input logic "if > 2v, vote amp relay on",

    and I will have a second button in may dash that will do the same, except amp relay will turn off.

    just need to find a 5v source somewhere tho...
    [H]
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  7. #7
    Fusion Brain Creator
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    Quote Originally Posted by ATT41 View Post
    oh ****, I meant to say can't,

    but it appears I have found a way to do it. I'm going to have an input logic "if > 2v, vote amp relay on",

    and I will have a second button in may dash that will do the same, except amp relay will turn off.

    just need to find a 5v source somewhere tho...
    take it off the FB analog inputs

  8. #8
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by ATT41 View Post
    Ok, so I am using the FB at the moment to trigger outputs (relays) for my amplifiers.

    I want to use a spare switch in my car's dash to do the same thing (as if I were clicking the button on the screen to turn on/off an output).

    The switch in my dash seems to only complete the circuit when the button is being pressed, once I stop pushing down the button, the circuit it broken.

    So I want MDX to change the output status as if the button is like a "down click vote" and not change until the next "down click vote"

    Hope this makes sense.
    The virtual button in MDX acts like a momentary, or the physical button?

    If you want the button to act like a latch, then have the button input increment a variable. Set the minimum time between votes to something like a second or more. Then another logic that says if the variable is 1, turn on output. Another for if variable >= 2, variable = 0. That will latch.
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  9. #9
    Newbie ATT41's Avatar
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    Great!

    Makes sense, but I'm having trouble making MDX do that.

    The first input logic will be "if amp switch is > 2v, then change variable +1"

    it seem that when I punch that it, it doesn't add 1 to the variable value, it replaces it with the number 1.

    Or am I doing something wrong? - I can host the config file if it helps?
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  10. #10
    Newbie ATT41's Avatar
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    Looks like I have figured out a way to do it

    For anybody else trying the same thing, this is what I am going to test with my FB (seems to work fine with the virtual brain so far).

    Only problem I forsee is holding the button down too long. but I shouldn't be holding the button for longer than 1 second I suppose.
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