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Modems

A.C. fishingA.C. fishing Posts: 262
edited 2006-06-17 15:31 in General Discussion
Is there any modem that can connect a Basic Stamp to the phone lines?
thanks,
AC

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Somebody said...
-Never Underestimate the power of human stupidity.
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Comments

  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-06-13 10:35
    A C -

    Most "Hayes Compatible" modems (AT command set) which are compatible with PC's should work fine with any BS-2 Stamp and bettter (BS-2sx, BS-2p, BS2-px, etc), so long as the communications parameters are compatible.

    There are also much smaller, embedded-style modems which can be PCB mounted for compactness. See Cermetek Modems for addiditonal information:
    http://www.cermetek.com/

    Regards,

    Bruce Bates

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  • steve_bsteve_b Posts: 1,563
    edited 2006-06-13 15:54
    Go to HamFests or flea markets and you should be able to find some old modems that are great for quick projects.
    For the most part, they can be controlled via serial strings from the stamp.

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    Steve

    "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
  • A.C. fishingA.C. fishing Posts: 262
    edited 2006-06-16 20:19
    Could I take an old phone, take of the buttons, and have the stamp dial numbers by sending high/low signals?

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    Somebody said...
    -Never Underestimate the power of human stupidity.
    ·
  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-06-16 21:42
    A. C. Fishing -

    No, but you may want to read the PBASIC Stamp Manual and check out the DTMF command and the circuits presented there.

    Regards,

    Bruce Bates

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  • A.C. fishingA.C. fishing Posts: 262
    edited 2006-06-16 21:47
    How can I have my BS2 connect to a modem using wireless?

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    Somebody said...
    -Never Underestimate the power of human stupidity.
    ·
  • steve_bsteve_b Posts: 1,563
    edited 2006-06-17 00:32
    About the only thing you could do with a touch tone phone is POSSIBLY connect transistors up to the button contacts and use the stamp to short them momentarily to give the idea of a button push....however, some reverseengineering would need to be done to verify your phone works that way!

    Another method is to make a matrix of small actuators or solenoids that will push the button for you...

    "How can I have my BS2 connect to a modem using wireless?"
    This is somewhat vague....wireless what?! telephone? Are you just trying to get a cheapy method of wireless comms?

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    Steve

    "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
  • pjvpjv Posts: 1,903
    edited 2006-06-17 03:26
    Hi A.C.

    Sometime ago there was an app note on the UBICOM (or was it Parallax) website desribing how to make a 2400 bps modem with an SX. I suspect its still there.

    If you study this thoroughly, I believe this project can be accomplished even more simply than that example if you are in for the design work and software. Some of the concepts were quite ingeneous.

    Cheers,

    Peter (pjv)
  • A.C. fishingA.C. fishing Posts: 262
    edited 2006-06-17 12:35
    When the button is pushed, electricity gets through, and the phone's micro chip detects that electricty, right? So what I was suggesting was to hook up the button contacts to P0-P10, and have the stamp send electricty down the contacts. I t hought this could be done using the high/low commands. Please explain why something like this wouldn't work.

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    Somebody said...
    -Never Underestimate the power of human stupidity.
    ·
  • A.C. fishingA.C. fishing Posts: 262
    edited 2006-06-17 12:37
    By wireless, I meant my BS2 robot roams the house, and it communications to a modem on a desk wirelessly.
    that is the best way I can explain it.

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    Somebody said...
    -Never Underestimate the power of human stupidity.
    ·
  • WhelzornWhelzorn Posts: 256
    edited 2006-06-17 15:00
    A.C., as it has been stated, connecting the phones button contacts to the BS2's pins is just a really complicated way of sending DTMF signals. There is already code that does this for the basic stamp, so why you would want to go through all the trouble with a phone is beyond me.
  • Bruce BatesBruce Bates Posts: 3,045
    edited 2006-06-17 15:31
    A C -

    This is only intended to aid you in asking for assistance. The reason I even mention the following is that it seems to be following a recurring pattern.

    Rather than asking as you did in the beginning of this thread:

    "Is there any modem that can connect a Basic Stamp to the phone lines?"

    then ending up with the following (so far!):

    "... BS2 robot roams the house, and it communications to a modem on a desk wirelessly."

    I suspect this is what you really are looking to ask, but please correct me if I'm wrong:

    How can I communicate with and control my roaming robot from my desktop computer?

    The answer to that question has been answered many times on these forums, and it involves nothing more than an RF transmitter and an RF receiver, along with a command protocal.

    You began your questions with presumptions - that you would need a modem, and/or that you would need DTMF tones. neither of which is the case. You could save us all a good bit of time, and yourself a good bit of anguish, if you'd just state what you'd like to do, then sit back and watch the responses. Then, when you see something that looks suitable, ask more about it.

    Please don't feel this is chastizing, as nothing could be further from the truth. We're all here to help each other, in the easiest manner we can.

    Regards,

    Bruce Bates

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