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Interfacing with a pc

Discussion in 'Electronic Design' started by Pauly_G2002, Jan 14, 2006.

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  1. Pauly_G2002

    Pauly_G2002 Guest

    Hi guys,

    I am trying to interface at sensor with a pc. I already know about USB,
    but was wondering if it is possible to interfacing with a microphone
    port. If so, does anyone know any good websites that provide infomation
    on this subject,

    thanks

    Paul
     
  2. Wim Ton

    Wim Ton Guest

    If the output is in the range between 50Hz and 20kHz, the microphone or line
    input may work.

    If the frequencies are lower, you can use a voltage to frequency converter.

    Elektor magazine published some designs using the serial port as a
    monostable multivibrator to measure resitance and large capacitance.

    You may use the joystick port to measure resistance between 1k and 50k.

    Wim
     
  3. Maybe you can tell what sensor you're talking about? After al you can
    connect everything that has wires to the microphone input but it will not
    make sense most of the times.

    petrus bitbyter
     
  4. googleing PCM2902 from Texas instruments may be interesting, as a
    starting point


    martin
     
  5. * But not all at once. ;-)

    Cheers!
    Rich
     
  6. Pauly_G2002

    Pauly_G2002 Guest

    Yes, sorry, how silly of me not giving you the detail, i hwas in a
    hurry that day

    Anyway, I have building a pulse rate device, basically I have a
    pressure sensor which varries between 0.25V and 4.5V depending on the
    pressure. Rather than using USB (as im on a budget) I thought about
    using the line in, firstly as it can be cheaper and secondly I could
    bypass the A/D convertions,

    hope this help makes things clearer on what I trying to do

    cheers

    Paul
     
  7. Joseph2k

    Joseph2k Guest

    Two obvious problems with that. First that still goes to the A/D converter.
    Second the input is probably not DC coupled, so that if your signal is slow
    it won't be seen at all.
     
  8. Well,

    Once more I missed at least one message. Seems my ISP cannot handle al the
    news even while running at least two news servers.

    Anyway, I don't understand the "pulse rate" device. A pressure sensor giving
    0.25-4.5V over its pressure range makes sense. But that means a relative
    slowly changing DC signal, which for sure will not be seen by the microphone
    input. Besides, a microphone tends to act on millivolts. Even the 0.25V will
    be too high for it.

    If you want to learn more about PC-port interfacing have a look at:
    http://www.beyondlogic.org/

    FAIK this site does not mention the gameport interface. This interface can
    be used to measure voltages from about 4V upward. Described - amongst
    others - in some Elektor books.

    petrus bitbyter
     
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