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two STAMPs connection — Parallax Forums

two STAMPs connection

ArchiverArchiver Posts: 46,084
edited 2000-11-16 06:11 in General Discussion
What's the safest way to connect one output pin of a STAMP to one
input pin of another STAMP? Do I need a resistor between two pins?
Thanks


Charles

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-11-15 22:01
    At 09:04 PM 11/15/2000 +0000, you wrote:
    >What's the safest way to connect one output pin of a STAMP to one
    >input pin of another STAMP? Do I need a resistor between two pins?
    >Thanks
    >
    >
    >Charles

    Charles -

    If you are attempting to network two Stamps together, please check pages 327,
    328 in the PBASIC Stamp Manual. The manual is available free from the Parallax
    web site:

    [noparse][[/noparse] http://www.parallaxinc.com ]

    in the documentations section. There's more to it than might meet the eye.

    Regards,

    Bruce Bates
  • ArchiverArchiver Posts: 46,084
    edited 2000-11-15 22:39
    > Charles -
    >
    > If you are attempting to network two Stamps together, please check
    pages 327, 328 in the PBASIC Stamp Manual. The manual is available
    free from the Parallax web site:
    >
    > [noparse][[/noparse] http://www.parallaxinc.com ]
    >
    > in the documentations section. There's more to it than might meet
    the eye.
    >
    > Regards,
    >
    > Bruce Bates

    Actually, my intention is to send status input of a stamp to the
    other stamp. Like external interrupt. I wonder I can directly
    connect two inputs together. Thanks for the posting.

    Charles
  • ArchiverArchiver Posts: 46,084
    edited 2000-11-15 23:51
    You can directly connect Stamp pins together, but it is a good idea to use a
    1k to 2k resistor because of the cost of the Stamp chip. If you have a
    software mistake where both pins are acting as outputs and "fight" each
    other, the resistor limits current to non-destructive levels.

    Ray McArthur
    Original Message
    From: <ckim@h...>
    To: <basicstamps@egroups.com>
    Sent: Wednesday, November 15, 2000 4:04 PM
    Subject: [noparse][[/noparse]basicstamps] two STAMPs connection


    > What's the safest way to connect one output pin of a STAMP to one
    > input pin of another STAMP? Do I need a resistor between two pins?
    > Thanks
    >
    >
    > Charles
  • ArchiverArchiver Posts: 46,084
    edited 2000-11-16 06:11
    At 10:39 PM 11/15/2000 +0000, you wrote:
    >> Charles -
    >>
    >> If you are attempting to network two Stamps together, please check
    >pages 327, 328 in the PBASIC Stamp Manual. The manual is available
    >free from the Parallax web site:
    >>
    >> [noparse][[/noparse] http://www.parallaxinc.com ]
    >>
    >> in the documentations section. There's more to it than might meet
    >the eye.
    >>
    >> Regards,
    >>
    >> Bruce Bates
    >
    >Actually, my intention is to send status input of a stamp to the
    >other stamp. Like external interrupt. I wonder I can directly
    >connect two inputs together. Thanks for the posting.
    >
    >Charles


    Hi Charles -

    Regardless of what you might be tempted to emulate, external interrupts just
    aren't available on a Stamp - somewhat sad to say. In large part polling is used
    as a replacement, but I presume you can see through that method, as merely a
    "circumvention" (of a sort).

    There are other u-processor platforms which permit external (and other)
    interrupts, but most have opted to migrate to PICs if interrupts were an
    imperative. BOTH have their place IMHO. Other information is available if you
    would care to contact me off list.

    Depending on your exact needs, I may have some hints for you.

    Regards,

    Bruce Bates
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