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Remote Dialer/Alarm

Discussion in 'General Electronics' started by Charles Jean, Oct 9, 2006.

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  1. Charles Jean

    Charles Jean Guest

    I've got a home alarm system that outputs one of 5 switch closures,
    depending on the alarm location. I've wired these to my home
    computer's LPT1 input port and written a program that monitors the
    LPT1 alarm inputs so that when an alarm occurs, it uses a terminal
    program and modem to dial my cell phone. That's where I am now. It's
    at the "at the tone please leave your message...." stage.

    I would like to be able to then play a *.wav file that would be left
    as voice mail notifying me that an alarm has occured and indicate the
    alarm's location.

    Is there a way I can wire the "line out" from my sound card into the
    phone line without going through the earphones/speakers?

    I'd thought about going through an computer-controlled SPST switch and
    a series capacitor. Is this possible?

    Thanks for any help.
     
  2. Stephen Rush

    Stephen Rush Guest

    Go to an amateur radio web site or the ARRL Handbook and look for a "phone
    patch." Your application won't need all of the facilities of a standard
    phone patch, because it doesn't have to be bidirectional. One thing to
    watch out for is that phone lines were not designed to be computer-friendly.
    There's about 50 VDC on the line when it's on-hook, and the ringing signal is
    about 100 volts of 20 Hz. One approach is to hack an inexpensive
    speakerphone.
     
  3. Ian Malcolm

    Ian Malcolm Guest


    Charles, please google 'Voice Modem', there's a fair chance you allready
    have the ability to play a wav file built into your modem. If not,
    cheapest and easiest would probably be change the modem.

    Also you've massively cross posted this :-( Its on
    alt.binaries.schematics.electronic, sci.electronics,
    sci.electronics.basics, sci.electronics.misc, sci.electronics.design

    Many of us killfile cross posts to four or more groups as its *usually*
    the sign of a troll. sci.electronics is a nearly dead group as it was
    replaced by its various sub-groups. As you aren't posting a binary,
    alt.binaries.schematics.electronic isn't really appropriate. At least
    you didn't multi-post it individually to each group :)

    P.S. sci.electronics.design tends to operate at a *somewhat* higher
    level and it helps if you have roughed out a circuit and can show you've
    done a bit of 'legwork' if asking questions there.
     
  4. John Fields

    John Fields Guest

    ---
    I disagree with all of the above, with one exception, that being
    that he did well by not multi-posting.

    First, I don't think many of us killfile posts (posters, actually,
    maybe threads...) because of numbers of crossposts and suspicion of
    trolling. I know I don't, you obviously don't, and I've never heard
    of anyone else doing it. Maybe I missed something, though?

    There's also nothing wrong with posting to a "nearly dead" newsgroup
    if you think you'll get a hit there, and he did, ISTM a substantial
    amount of work before posting to sed, so I don't really see a
    problem there either.

    Finally, it's OK to post non-binaries to abse. It must be, since
    you did, no? ;) Also, take a look at the ratio of binaries to
    non-binaries and the lack of complaints and it becomes obvious that
    posting either or both suits the culture of the group.
     
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