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7 seg LED display pin-out

Discussion in 'Electronic Design' started by miken, Mar 16, 2007.

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  1. miken

    miken Guest

    I am in need of the pin-out for the HDSP-5621 .56" Dual 7 segment LED
    High Performance Green display. Right hand decimal point. Common

    Can someone put a copy of the datasheet on abse, or send me the
    pinout, or advise a URL for the datasheet.

    thanks MikeN
  2. Hi Mike,
    You may have noticed Clear's usenet feed is stuffed again.

    You can download it from
  3. This isnt' a design question, and you obviously haven't looked very

    A clue, though I don't know why I bother when you can't post in the
    right place, is that there is a far level of standardization, so
    find a pinout of that sort of device (and if you don't know where
    to look, you shouldn't be posting in .design) and likely it will
    be a match.

    For that matter, by the time you get to the .design stage, you'd
    not have to ask, you'd have figured out how to get the pinouts
    using the device at hand.

  4. miken

    miken Guest

    Well - we have been sucking on a lemon this morning - haven't we.

    My enquiry evolved when the usenet feeds to NewZealand fell over
    (blame our telcos) and I was trying to confirm a pinout before
    continuing with a design I was contemplating.

    My usual source wasn't responding, hence my enquiry to the wider

    It transpires that the device isn't quute as standard as you have
    suggested. Several pinouts of very similar devices exist.

    Where do you suggest I should have looked?

  5. Anon bozo

    Anon bozo Guest

    Well - we have been sucking on a lemon this morning - haven't we.

    Don't mind them, Mike. Some folks really can't follow their own advice: if
    the posted question bothers them so much, DON'T REPLY. Fer chrissake.

    But then, what would they do with their lives if not reply to messages they
    detest? Ooo, a conundrum...
  6. linnix

    linnix Guest

    It's very simple to figure out. Just use a 3V battery and a small
    resistor. Hook it up to pair of pins and you will see a pattern.
    If you can't even do that, then forget about doing the design.
  7. Well bozo, what we have is a newsgroup full of junk. NOt just the political
    stuff and the posts about the weather, but idiots like the original poster
    who thinks the pinout of an LED display is a "design" question. We get
    people posting here who even say "well this seemed to be the busiest
    of the sci.electronics.* newsgroups so I'll post here". We get people
    posting "I know this isn't a design question, but I'll post anyway". People
    asking about software that doesn't belong here, and all kinds of other

    LIke I keep saying, back in 1995, sci.electronics was split into the
    multiple groups we see today. Back then, some decided the traffic
    was too much, and breaking it down into more specific newsgroups would
    ease the matter.

    But, idiots like the original poster put it all back together. Don't
    find the right newsgroup to post in, just add to the clutter of At this rate, we might as well close down
    all the rest of the subgroups, because they get underused while the
    posts that belong there land here.

    When bozos can't be bothered posting in the right place, I no longer
    feel particularly interested in going out of may way to help them. Thus
    instead of getting an answer by posting "where there's lots of traffic"
    they may just not get a good answer. I should also point out that
    when beginners foolishly post here, they are more than likely to not
    get a good answer either, because the "regulars" who think
    sci.electronics.deisgn is their hangout take the questions litterally,
    and don't provide an answer that's useful to a beginner.

    Not only was this not a design question, but only a beginner would be
    puzzling over the pinouts. Anyone who is really up to posting in .design
    (at least as it was originally intended) would either have resources that
    would help them with the pinout (either directly, or have the background
    to know where to look), or hey, they'd know how easy it is to trace out
    the pinouts of an LED display. You get a voltage source, a current
    limiting resistor, and put that display in a breadboard, and trace
    away. It won't take very many tries to get a common pin, and then
    it's real easy to map out the rest.

    If the bozo who started this thread had asked where this level of
    question belongs, sci.electronics.basics then I would have responded
    to a beginner. If he'd asked in sci.electronics.components I might
    have simply ignored the question, depending on whether or not I felt
    like putting effort into providing an answer.

    But once he wants to pose as a "designer" then he deserves to be ill-treated
    when he immediately shows off his lack of knowledge.

    Once again, for the clueless, read Mark Zenier's guide to the
    sci.electronics.* hierarchy,

  8. Rich Grise

    Rich Grise Guest

    So what? What's the big deal? What's so difficult about just ignoring
    the crap, or can't your pea-brain grasp the concept that YOU are
    responsible for what you choose to read and what you choose to ignore?

    At least in America, we have the right to Freedom of Speech.

    If you want to hang out around here, you'd better learn to grow a skin.

  9. Anon bozo

    Anon bozo Guest

    So lament! But why add to the crap by replying to a post you don't think
    necessary or appropriate? It's akin to replying to a troll...
  10. Rich Grise

    Rich Grise Guest

    That's called, variously, trollfeeding or trollbaiting, but in this case,
    I don't think either you or miken was trolling - Michael is merely flaming.

    Welcome to the zoo! ;-)

  11. Mark Zenier

    Mark Zenier Guest

    Hi Michael,

    I decided to celebrate catching up with a 6 month backlog of this group
    (largely by tossing out most of the noise and crap) with a rewrite.

    Comments, anyone?

    Viewers Guide to the USENET sci.electronics newsgroups. [March 24, 2007]

    This FAQ is a tourist's guide to the various electronics newsgroups.

    Some Comments and Q&A.

    Some things to remember. These newsgroups are worldwide in coverage.
    That means that criticizing someone's English, making nationalistic
    remarks, personal insults, and criticizing another poster's intelligence
    are invitations to pointless flame wars.

    And the computer equipment that will be used to read these messages is
    anything but uniform. Any extensions that your computer has to support
    various character sets will not always be reliably transmitted or
    displayed at the other end. So avoid fancy superscript characters,
    degrees temperature, Greek letters, and line drawing characters like the
    IBM PC extended character set. There are newer standards for indicating
    the character interpretation to be used with a posting, but there's no
    guarantee that the person on the other end is up to date.

    You should also consider where a poster is when they request the closest
    source for some product or information. Not everybody has a Radio Shack
    in the nearest shopping mall. A common problem is that the toll free
    800 numbers common in North America are not easily or cheaply accessible
    from the rest of the world. Look closely at the originators domain address
    to see if they can contact your recommended source.

    Keep in mind that various systems and standards are different around
    the world. Household power voltages and frequencies are different,
    and the techniques and regulations to deal with wiring are different
    enough to cause safety problems if you try to use the wrong one.
    Video systems (originally tied to the power line frequency) are also
    widely different around the world. Different scan rates and encoding
    systems make things incompatible. More recent innovations are even
    more diverse. For example, stereo audio on television transmissions
    in the UK, Scandinavian countries, and other parts of Europe is a
    almost CD quality digital transmission, while in the US, the MTS system
    is a variation on the analog sub-carrier system used for FM stereo.

    Not only are the systems different, so is the jargon used to describe
    them. What might be a Ground Fault Interrupter in North America, would
    be a Residual Current Circuit Breaker across the Atlantic. And what was
    written as 4.7 k ohms, might by (from the requirements of the schematic
    drafting standards) be given as 4k7 ohms.

    Q. "Someone has to give me an answer!"

    A. Nope, sorry. Everybody here (except a few salesmen) is doing it
    for their own purposes, and no question is guaranteed to get an
    answer. Getting obnoxious about it, or repeating the question
    across every possible newsgroup, or over and over again won't win
    any friends and marks you as the archetypical "newbie".

    Q. "Just GOOGLE it"

    A. If that's going to be your followup post, just shut up and
    save the bandwidth. By this point in time, (after Google
    has been running a dozen years), everybody knows about it.
    At a minium, give the search terms and a critique of a few
    of the more useful sites that you found in doing that search,
    with direct URLs.

    Q. "What is cross-posting, and is it bad?"

    A. Cross-posting is where many discussion group names are included in
    the "Newsgroups" header of a posting. This causes them to be
    distributed to each of those newsgroups when they are received
    and processed at a news server. (Note that Usenet is not like
    the World Wide Web. In contrast to the Web, postings are
    distributed worldwide to thousands of separate computer systems,
    so sending just one message instead of many is beneficial.)

    Like many feature of Usenet news, it can be abused. For
    example, Posting to large numbers of groups at once, or posting
    to groups that have incompatible discussion topics as a form of
    harassment. This has gained it a bad reputation that the
    dogmatic have converted into legendary restrictions.

    Try to limit posting to the one newsgroup whose topic matches
    your subject. If it does seem to overlap a couple of newsgroups'
    topics, cross-post if you must.

    You should avoid multiple postings. This is where you send a
    separate posting to multiple newsgroups. This causes several
    bad things. It creates that much more data that each news
    server system has to process. It starts a separate disconnected
    discussion thread in each newsgroup. And it causes for anyone
    who reads many of the newsgroups to see the posting repeated for
    each group. Any competent newsreader software will only show
    a cross-posted message to the reader once, but has no way of
    dealing with these seperate discussion threads.

    Q. Are advertisements restricted to ONLY

    A. That's the idea.

    Q. Why can't I advertise my [stereo/computer/...] for sale in

    A. For the main reason the group is for an audience that isn't
    interested in buying them. (Note the word 'Industry' in the
    newsgroup name. If you can buy it at the nearest shopping mall,
    it doesn't belong here). And the second good reason is there
    are already well established groups for those purposes. Try the groups,,,

    Q. Can I post graphics images to these groups.

    A. As a consideration towards small sites and users that use
    automatic downloading software, the text groups in the big-8 news
    hierarchies are generally off limits to binary content posts.
    This is enforced by filtering software at the news servers.
    Either your posting will get rejected when you try to do this,
    or it will get dropped when processed as incoming news at another
    news server. So a large part of your audience will most likely
    never see it.

    Binary content postings are allowed in the alt.binaries hierarchy.
    The newsgroup alt.binaries.schematics.electronic (Note the usual
    Usenet reverse polish naming convention) was set up to support
    postings of images deriving from discussions in the sci.electronics.*
    and other electronics newsgroups.

    If your default news server does not carry the alt.binaries groups
    (due to the insane traffic volume), there are some free sites with
    read only acess (see the newsgroup, and there
    are many commercial NSPs (news service providers) where (by changing
    the configuration on your news server or browers) you can read and
    post through them (with an account name and password). [Suggestions?]

    Try, for line drawings, to use a compressed file format. Recommended
    are monochrome .pdf files or and indexed format like GIF or PNG, or TIFF.
    The smallest files seem to be the formats (mono .pdf, TIFF) that use
    the Group 4 CCITT fax compression algorithm, with .png and .gif being
    somewhat bigger. JPG, jpeg doesn't work well on line drawings.

    Retention times on alt.binaries may be short, as set by each
    news servers operation policy. If you have content that has
    some long term value, try to set up a web site, or ftp directory.

    Q. What's the difference between sci.electronic.components, .design,
    and .equipment?

    A. The split here is set up on levels of complexity. In this field
    of technology, people look for solutions to problems along these
    levels. Someone who is looking for a box that solves their
    problems is working at a higher level of detail than someone who
    is designing a module (circuit board) and that second person is
    working at a higher level than someone looking for a pre-built
    integrated circuit that they need to purchase.

    The proposed components group is for questions dealing with
    individual parts. Someone working on this level is looking for
    a specific function or source or identification for an
    electronic component. Postings requesting the identification of
    an integrated circuit are a large portion of the current

    The design group is for persons combining components into
    circuits. Discussion on design solutions and techniques.

    The equipment group is for persons looking for already available
    solutions to their problems. In other words, if someone is
    looking for a solution to their problem, and wants to buy
    something with a warranty, and that has a salesman and tech
    support along with it, .equipment is the place to ask for
    advice. (This is not the place to suggest that the person can
    go down to Radio Shack and get a 555 and wire up a circuit.)

    Q. What's left for sci.electronics.misc?

    A. Gossip, history, trivia, manufacturing, systems, standards,
    announcements ...

    Charters and description lines.

    sci.electronics.basics Elementary questions about electronics.

    "A forum for discussion of electronics where there is no such
    thing as a stupid question. Beginners questions. Discussion of
    electronics education. Requests for other sources of information."

    sci.electronics.cad Schematic drafting, printed circuit layout, simulation.

    "sci.electronics.cad is an unmoderated group for the discussion
    of Computer Aided Design software (and systems) for use in
    designing electronic circuits and assemblies. Topics can
    include Schematic "Capture" software, Printed Circuit Board
    layout software, introductory and educational use of circuit
    simulation software such as Spice, obtaining simulation
    descriptions (Spice models) for electronic components, and any
    other computer software that relates to designing electronic
    circuits at the printed circuit board level."

    sci.electronics.components Integrated circuits, resistors, capacitors.

    "Discussions of electronics at the component level. The use,
    limitations, and identification of resistors, capacitors,
    integrated circuits, connectors, enclosures, ... and so on.
    Locations and contact information for Manufacturers,
    Distributors, and other sources for supply and technical
    information." Electronic circuit design.

    "Discussions relevant to the design of electronics circuits." Test, lab, & industrial electronic products.

    "Discussion of the application and internal operation and
    relative merits of test equipment, laboratory equipment, and
    industrial equipment. This is not a forsale group.
    Buying/selling is supposed to occur in the relocated
    misc.industry.electronics.marketplace group. (Discussions on the
    relative merits of various consumer electronics equipment are
    better held in the groups in the rec hierarchy devoted to those

    sci.electronics.misc General discussions of the field of electronics.

    "General discussions on the topic of electronics. (Discussions
    on the relative merits of various consumer electronics equipment
    are better held in the groups in the rec hierarchy devoted to
    those topics.)" Fixing electronic equipment.

    " is an unmoderated group for the
    discussion of repairing electronic equipment. Topics to
    include: Requests for assistance, Where to obtain servicing
    information and parts, Techniques for diagnosis and repair, and
    Anecdotes about success, failures and problems with equipment

    misc.industry.electronics.marketplace Electronics products & services.

    "Advertisement and discussion for the buying, selling, and
    bartering of electronic components (integrated circuits,
    resistor, capacitors, etc.), electronics test equipment,
    electronics laboratory equipment, electronics industrial
    equipment, and services used for the production of electronics.

    Other groups of interest

  12. jasen

    jasen Guest

    good stuff!
    You appear to be misspelling Polish and misusing the term "reverse Polish"
    I believe ther term you want is "heirachial" or "bass-ackwards"
    one way is to serch on (but often it'll find an unsecured
    server that'll later lock you out)
    JPG doesn't woprk as well on line drawings, it's still 1000 times better
    than posting bmp.

    mention of ASCII schematics (which can be posted in any group)
    and how to read them is notably missing.
    discussing the FAQ ? :) (added)
    possibly add the following:
    Posters here should have more than a basic understanding of
    electronics otherwise ask in S.E.B.

  13. Gary Peek

    Gary Peek Guest

    Yes, good work, and I hope you can post this FAQ periodically,
    because it could really help some of the beginners. Once a week
    would not be too often.

    I tried to contact you a while back with no response (don't know
    why), about the possibility of a FAQ having a number of references
    to specific areas of interest that many people post questions about
    on this and other electronic newsgroups. For example, many people
    ask basic questions about LED's, op-amps, etc.

    Let me know if you want to do this, I have a modest start on
    a groups of links.

    I also contacted the fellow from ec3 (forgot his name) that
    periodically posts information about _searching_ for electronics
    info, but didn't hear from him either. That could be added.
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