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Thread: can I control a relay from a com port?

  1. #1
    n00b 4 life mp3oplecarrier's Avatar
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    can I control a relay from a com port?

    Has anybody got a simple fix to allow me to switch on/off my text display in software perhaps by using the com port? This seems like something that shouldn't be too hard and somebody is bound to have thought of a solution before... (yes I have searched!)

    Cheers
    Steve
    ....Yes, I know it has a stupid name, those crazy Japanese!

  2. #2
    My Village Called 0l33l's Avatar
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    You can turn off Matrix Orbital LCDs in software (LCDC).

  3. #3
    Maximum Bitrate binary.h4x's Avatar
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    yes.


    HVAC Control on Car PC through Serial Port.

    the Hardware Development forum is full of threads on this.
    2007 Honda Fit Sport 1.5L SOHC-VTEC

  4. #4
    n00b 4 life mp3oplecarrier's Avatar
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    Matrix orbital not an option, I have a nice parallel device fitted,, which means that the link binary supplied is no good as it is parallel not serial (thanks anyway). Anyone any ideas or am I going to have to fit a switch (!)

    Steve
    ....Yes, I know it has a stupid name, those crazy Japanese!

  5. #5
    Newbie DJBigShow's Avatar
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    Quote Originally Posted by mp3oplecarrier
    Matrix orbital not an option, I have a nice parallel device fitted,, which means that the link binary supplied is no good as it is parallel not serial (thanks anyway). Anyone any ideas or am I going to have to fit a switch (!)

    Steve
    Hi Steve,

    There are several lines on the com port which can be controlled from software, CTS/RTS are an example of these two signals. It would depend on what OS You are running, and whether you are looking for an already-written program, or writing one yourself! If you need more then the two signals available, then it gets far more complicated.

    -DJBS

  6. #6
    What can I say? I like serial. Curiosity's Avatar
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    You can connect 2 relays to it, but they will click a few times while Windows boots up and starts the drivers, checks for a mouse, etc.

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