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Thread: Relay card or IO Interface?

  1. #1
    Newbie jazz13's Avatar
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    Relay card or IO Interface?

    I'm just trying to wrap my head around what hardware I need in order to perform certain functions with my CarPC.

    Basically, I NEED to control my amp and signal it to turn on via the remote lead and I've pretty much figured I need a relay card for that so that I can switch the required 12v from another source.

    But for controlling windows, locks and such other things, do I need a relay card or will something with digital outputs do? From what I've found in researching this, it depends how the car is wired up? ie: if the window switch is wired to + or -. If it's + then I need a relay, if it's - I can use a digital output?

    I think I've got it sorted, I'm just hoping that someone that has done this before can give me some difinitive info before I go and purchase the parts.

    Parts I am looking at are:
    http://www.phidgets.com/index.php?mo...9.44.74&IID=57
    as an IO interface.

    or:
    http://www.phidgets.com/index.php?mo...9.44.74&IID=12
    as a relay interface.

  2. #2
    Variable Bitrate egeekial's Avatar
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    I was just about to post something along these lines... I'm interested in integrating some stuff into my carputer... locks, windows, and the like.

  3. #3
    My Village Called 0l33l's Avatar
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    I wish I had some time to code an app for this. I'm still working on the skin part... that kind of got pushed back with the development of NaviVoice and GammaControl.

  4. #4
    Newbie jazz13's Avatar
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    Quote Originally Posted by 0l33l
    I wish I had some time to code an app for this. I'm still working on the skin part... that kind of got pushed back with the development of NaviVoice and GammaControl.
    I'm already writing my own software that will have a plugin to do this sort of stuff. Already have MP3s, vids, a basic GPS plugin and a menu system working (altho not pretty, need to implement skins) and the next one I want to write is some kind of car control/monitor thing.

  5. #5
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by jazz13
    I'm already writing my own software that will have a plugin to do this sort of stuff. Already have MP3s, vids, a basic GPS plugin and a menu system working (altho not pretty, need to implement skins) and the next one I want to write is some kind of car control/monitor thing.
    Cool What language?

  6. #6
    Newbie jazz13's Avatar
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    Quote Originally Posted by 0l33l
    Cool What language?

    VB

    I figured it'd be easier for other developers to write their own plugins if i used VB. Creating ActiveX Dlls to use as plugins is a sinch and the API i'm coming up with makes it a breeze to implement new features.

  7. #7
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by jazz13
    VB

    I figured it'd be easier for other developers to write their own plugins if i used VB. Creating ActiveX Dlls to use as plugins is a sinch and the API i'm coming up with makes it a breeze to implement new features.
    If you would have written it in Delphi then I could have given you some code for skins.

  8. #8
    Maximum Bitrate kiltjim's Avatar
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    Take a look at this card before you go to a phidget.

    I am writing a program to control it myself, and by the time the card is released, I should be finished with the program.

    You can use a relay if the windows are negative controlled. You just have the switched side running to ground, instead of running it to positive. Either way you can use a digital signal.

    The neat thing about having a relay card is that all your digital signals are interpretted by the card, and sent to the correct relay. With the way any of these cards are set up, you can just ignore a relay, and use the switching signal as a 'digital' output. You just have to adjust the voltage level, or perform some slight alteration.
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  9. #9
    Newbie jazz13's Avatar
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    Quote Originally Posted by kiltjim
    Take a look at this card before you go to a phidget.

    I am writing a program to control it myself, and by the time the card is released, I should be finished with the program.

    You can use a relay if the windows are negative controlled. You just have the switched side running to ground, instead of running it to positive. Either way you can use a digital signal.

    The neat thing about having a relay card is that all your digital signals are interpretted by the card, and sent to the correct relay. With the way any of these cards are set up, you can just ignore a relay, and use the switching signal as a 'digital' output. You just have to adjust the voltage level, or perform some slight alteration.
    Still not quite clear on this.

    If my power windows are negative controlled then can I do WITHOUT a relay card?

    It's just that I'm gonna be hooking up quite a number of things to it and getting a relay card with only 4 relays just isn't going to be enough.

  10. #10
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by jazz13
    Still not quite clear on this.

    If my power windows are negative controlled then can I do WITHOUT a relay card?

    It's just that I'm gonna be hooking up quite a number of things to it and getting a relay card with only 4 relays just isn't going to be enough.
    No. Doesn't matter if your windows are negative or positive controlled, you will have to use 2 relays for each window.

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