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Thread: Simply serial input circuit

  1. #41
    Raw Wave
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    I think hes got a good point there.

    Because the USB-SERIAL converter cost around $55 here in europe (UK) probably more in Denmark.

    Very unlikely someone will be using the parallel port in the car...so why not have the option to use it?

  2. #42
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    Quote Originally Posted by 4u2n
    Now the problem is if you have a MINI-itx with only 1 seriel port and have all ready plan to use it for OBDII then, you use this solution,

    Is it possible to use a part of the printer port
    Yup

    Theres plenty of I/O lines on the parallel port, it just a matter of adjusting the s/w such that it reads from this port instead.

    Persuade frodo, he might do it

  3. #43
    Raw Wave rando's Avatar
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    The reason not to use the parallel port is that it's impossible to control the individual lines of the port from Windows NT/XP without installing a custom driver. Sure there are drivers out there that allow it but most of them also completely circumvent the the ability of the OS to protect itself from applications and applications from each other -- Never mind the security implications (which may matter to some carpc users with network connectivity).

    It's still possible to do this using the native Windows printer driver interface to the parallel port but someone would need to hack out the details. For now, let's be happy that Frodo decided to take the first step. The USB/RS232 dongles can be had on ebay for around $10US. In any case, this thread is about a serial implementation of this capability. If someone wants to propose something else, start a new thread and provide some sample code. Perhaps Frodo (or one of the other front-end developers) will consider it for a future version.

    As a side note, as part of the Radio project I'm working on with Seth, I already have code and a driver to control the individual lines of the parallel port working. That solution was really only designed for testing. The production implementation goal is still USB -- though a serial version may get implemented also (first).

  4. #44
    Raw Wave rando's Avatar
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    Also depending on which pins your other devices use, it might be possible to share a single serial port between multiple devices. As it is, this solution uses 3 pins but it could easily be stripped down to use only 1 (with code and minor circuit change).

  5. #45
    Variable Bitrate 4u2n's Avatar
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    Quote Originally Posted by Ricky327
    I think hes got a good point there.

    Because the USB-SERIAL converter cost around $55 here in europe (UK) probably more in Denmark.

    Very unlikely someone will be using the parallel port in the car...so why not have the option to use it?
    Thats right use an option seriel or parallel

    In denmark standard hardware are price normal, buth when we got speciel hardware it cost
    Plan for project = 100%
    Part the project. = 100%
    Built...................= 99%
    Finish.................= 99%
    Install ...............= 99% -50%
    Ditail at 4u2n.dk
    Here

  6. #46
    Raw Wave rando's Avatar
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    You could always write your own software to monitor your parallel port and foward the result to a virtual serial port. FP would work just fine with that.

  7. #47
    Newbie thasaint's Avatar
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    it's easy...if you don't want to use it while driving...don't

    you guys are too funny, trying to over technify a simple process, but more power to you.
    the flesh does not determine what is within.

    carputer is in begining status

  8. #48
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    Quote Originally Posted by thasaint
    it's easy...if you don't want to use it while driving...don't

    you guys are too funny, trying to over technify a simple process, but more power to you.
    Not after you had an accident and was proven you had an illegaly installed device that may have caused the accident.

    Not that we cant switch off the movies while driving, its the law that we need to follow.

  9. #49
    Raw Wave
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    Quote Originally Posted by rando
    In any case, this thread is about a serial implementation of this capability. If someone wants to propose something else, start a new thread and provide some sample code.
    I agree but it was only a suggestion made by "4u2n" and I backed him up by asking questions in which you respond to. We all go out of topics now and again...infact it wasnt even off topics


    Quote Originally Posted by rando
    As a side note, as part of the Radio project I'm working on with Seth, I already have code and a driver to control the individual lines of the parallel port working
    Good news for some then

  10. #50
    Raw Wave rando's Avatar
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    This thread is about a simple SERIAL based circuit that anyone can build, including Frodo, to support the (now implemented) lockout feature in FP. As I've already mentioned, there is no reason for FP to support multiple methods. If someone wants to use another signaling method, it's a simple matter to proxy that over to a virtual serial port.

    Regarding the parallel port code (which is truly only appropriate for testing) my point was that it will be made available shortly. If I get a chance I might even tweek it to what you want (i.e. proxy a parallel port pin over to a virtual serial port). I wouldn't implement my system that way but if others want to, that's up to them.

    @thasaint: The lockout mechanism is required for some of us to be compliant with the laws in our area.

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