Connect with us

Remote Dialer/Alarm

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

Scroll to continue with content
  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
  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,

    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. 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.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day