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slide projector controlled by pc

Discussion in 'General Electronics' started by Gert Everaert, May 1, 2004.

  1. Hi group,

    I would like to control my slide projector with my pc. Unfortunately, the
    projector has no serial interface, only a connector for an AV recorder
    (which uses an extra track for 1000 Hz sync pulses). Can I use a soundcard
    to do this ? I want to switch to the next slide by some PC-command
    Thanks,

    Gert
     
  2. the Wiz

    the Wiz Guest

    If the PC is running DOS, the SOUND statement in QBASIC or GWBASIC could be used
    to generate the tone.

    If the PC is running Windows, it's somewhat more complex ;-)

    The soundcard would also have to deliver sufficient signal to drive the tone
    detector circuit in the slide projector - the audible "beep" is often at the
    peak level of the narration.

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    VB3/VB6/C/PowerBasic source code: http://www.jecarter.com/programs.html
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  3. scada

    scada Guest

    You can download a number of free Virtual Signal Generators that will run in
    the Windows environment. Try outputting the 1000 HZ tone, with the Audio
    output card connected to the AV recorder input. You may need to run that
    signal through some amplification to get it to the proper level, or the
    windows program level control may be enough. If that works, writing a small
    program in your favorite language should be easy. For instance, in VB it
    would only require a few lines of code to have a button output the required
    tone.
     
  4. Gordon Youd

    Gordon Youd Guest

    Back in the "good old days" we used to use a tape recorder.

    Track one recorded the music/speech, the other track recorded the 1000Hz at
    the right point for slide change.

    Great stuff!.

    Regards, Gordon.
    ---------------------------------------------------------
     
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