Connect with us

Dot Matrix displays

Discussion in 'Electronic Design' started by George Francis, Sep 13, 2003.

Scroll to continue with content
  1. I need about 25 ( 5 x 7 ) dot matrix displays. Prefer green, but red
    OK. Does anyone have some for sale. Please advise: Cost., etc.
  2. What exactly are you looking for?
  3. Keith: Thanks for the response. I need single displays....5 x 7
    matrix...Preferable similar to the couple I have. GMC7975CA
    (Fairchild) , 12 pin DIP. Column Anode configuration. Physical size
    is not important, altho those I have are 3/4 wide by 1 inch high.
  4. I think I have a bunch of HP 5x7s squirreled away somewhere that
    I rescued from the crusher. I'll have to look to see if I have an
    interesting number. They may be mixed colors though and likely
    not matched. I'll look.

    Send me a note with your groveling. I have to make sure you'll
    give them a good home. One must do the best for those one has
    protected from the crusher for a decade (or more)! ;-)
  5. Chris Carlen

    Chris Carlen Guest stocks LiteON dot matrices. What size/color/polarity?

    Good day!

    Christopher R. Carlen
    Principal Laser/Optical Technologist
    Sandia National Laboratories CA USA
    -- NOTE: Remove "BOGUS" from email address to reply.
  6. Keith:

    Very good.! The colors may not matter so whatever you have will be
    of much interest to me. They will get a "good home" might be
    considered a "humanitarian effort" on your part. :). Regards. GHF
  7. No, they're a single 12-pin DIPs with four digits each. The characters
    are necessarily smaller, since there are four in the same sized
    package. I've used the single character LEDs before. Let me look some
    Hmmm, perhaps my spam filter tossed the note. I'm getting inundated
    with virus laden email, so I'm forced to empty my trash folder nightly
    (or have the virus scanner turn me in ;-). If you would, resend the
  8. A E

    A E Guest

    Oh I hope you don't mean the HDSP2000 series... They might look nice in a retro kind of way, but they suck huge amounts
    of current and need constant babying in the form of clocking in data and supplying the bit patterns...
  9. Them's the ones. ;-) They aren't all that bad to babysat. I had 8051
    derivative running the buttons 'n lights, so babysitting was a just few
    hundred lines of simple code (count character position, get character,
    look up 5x7 pattern, index to column displayed, shift out seven bits,
    rinse, repeat ;). The eye is so slow and even the 8051 comparatively
    fast that it didn't even take a significant part of the 8051's time.
    The current wasn't all *that* bad either (few hundred mA max.). That
    said, I wouldn't have used the part were it my choice (indeed I
    replaced it with a 4x40 LCD display).
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