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higher current for Max7219 — Parallax Forums

higher current for Max7219

ArchiverArchiver Posts: 46,084
edited 2002-07-12 05:37 in General Discussion
What is a good way to drive higher current LED displays with the
Max7219. By higher I mean making each display
segment out of 8 individual LED's. Overall display
is about 8 inch tall with 56 LED's.

Something like this:

OOOOOOOO
O O
O O
O O
O O
O O
O O
O O
OOOOOOOO
O O
O O
O O
O O
O O
O O
O O
OOOOOOOO

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-07-11 19:10
    I implemented a max7219 with 5 LED's per segment by simply using the MAX7219 to
    drive a high current op amp for each segment.
    yukweyok <lotharc@c...> wrote: What is a good way to drive higher current
    LED displays with the
    Max7219. By higher I mean making each display
    segment out of 8 individual LED's. Overall display
    is about 8 inch tall with 56 LED's.

    Something like this:

    OOOOOOOO
    O O
    O O
    O O
    O O
    O O
    O O
    O O
    OOOOOOOO
    O O
    O O
    O O
    O O
    O O
    O O
    O O
    OOOOOOOO




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  • ArchiverArchiver Posts: 46,084
    edited 2002-07-11 20:02
    Jay,

    Thanks for the idea, could you tell me the details.
    I almost know how a transitor works, but I would
    rate my electronic knowledge as novice.

    Lothar




    --- In basicstamps@y..., Jay Mann <jay_mann2000@y...> wrote:
    >
    > I implemented a max7219 with 5 LED's per segment by simply using
    the MAX7219 to drive a high current op amp for each segment.
    > yukweyok <lotharc@c...> wrote: What is a good way to drive higher
    current LED displays with the
    > Max7219. By higher I mean making each display
    > segment out of 8 individual LED's. Overall display
    > is about 8 inch tall with 56 LED's.
    >
    > Something like this:
    >
    > OOOOOOOO
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > OOOOOOOO
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > OOOOOOOO
    >
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@y...
    > from the same email address that you subscribed. Text in the
    Subject and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    >
    >
    >
    >
    >
    > Do You Yahoo!?
    > New! SBC Yahoo! Dial - 1st Month Free & unlimited access
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2002-07-11 21:55
    Why do you need a higher current
    I think you need a higher voltage
    Connect the leds per segment in serie ( as done in bigger displays)
    and connet like in the datasheet of the MAX7219

    http://www.maxim-ic.com/quick_view2.cfm?qv_pk=1339


    all you need is a MAX394

    Check out the free sample section.

    Rene


    Oorspronkelijk bericht
    Van: yukweyok [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RczcbICl-cRlVvVUKSkAQghdGWeuc6WxbTKD37PQd_r_VqGlimbSP7PCQR4hedkzZ-vPF7bI4w]lotharc@c...[/url
    Verzonden: donderdag 11 juli 2002 18:09
    Aan: basicstamps@yahoogroups.com
    Onderwerp: [noparse][[/noparse]basicstamps] higher current for Max7219


    What is a good way to drive higher current LED displays with the
    Max7219. By higher I mean making each display
    segment out of 8 individual LED's. Overall display
    is about 8 inch tall with 56 LED's.

    Something like this:

    OOOOOOOO
    O O
    O O
    O O
    O O
    O O
    O O
    O O
    OOOOOOOO
    O O
    O O
    O O
    O O
    O O
    O O
    O O
    OOOOOOOO




    To UNSUBSCRIBE, just send mail to:
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    from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.


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  • ArchiverArchiver Posts: 46,084
    edited 2002-07-12 05:37
    I will give you a schematic. Email off this list : jmanning@e... and I
    will let you know what to do..
    send me the info on the forward voltage of each LED. or just give me a part
    number and manufacturer and I will let you know what to do.
    Thanks,
    J.
    yukweyok <lotharc@c...> wrote: Jay,

    Thanks for the idea, could you tell me the details.
    I almost know how a transitor works, but I would
    rate my electronic knowledge as novice.

    Lothar




    --- In basicstamps@y..., Jay Mann wrote:
    >
    > I implemented a max7219 with 5 LED's per segment by simply using
    the MAX7219 to drive a high current op amp for each segment.
    > yukweyok wrote: What is a good way to drive higher
    current LED displays with the
    > Max7219. By higher I mean making each display
    > segment out of 8 individual LED's. Overall display
    > is about 8 inch tall with 56 LED's.
    >
    > Something like this:
    >
    > OOOOOOOO
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > OOOOOOOO
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > O O
    > OOOOOOOO
    >
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@y...
    > from the same email address that you subscribed. Text in the
    Subject and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    >
    >
    >
    >
    >
    > Do You Yahoo!?
    > New! SBC Yahoo! Dial - 1st Month Free & unlimited access
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]


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