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16 segment LEDs — Parallax Forums

16 segment LEDs

BADHABITBADHABIT Posts: 138
edited 2009-05-24 00:33 in Propeller 1
I have been trying to find some documentation to that will show me how to connect and program a 16 segment display. So far I have found only bits and pcs that need to be cobbled together to create a whole understanding.

This document got me closer, but not quite there. http://www.maxim-ic.com/appnotes.cfm/an_pk/3212

Does an interface chip make it easier, along w/reducing pin usage

It would be cool if there was a driver in the OBEX too.

Comments

  • kwinnkwinn Posts: 8,697
    edited 2009-05-22 17:40
    Basically you have all the information you need in the maxim document. The 16 segment displays are very similar to a 7 segment display, only with more segments. Like the 7 segment displays, the anode connection must be connected to a positive voltage when selected, and the cathodes connected through a current limiting circuit/resistor to ground to light the segment. Basically it needs 16 segment drivers instead of 7. Plus the decimal point if desired.

    If you are using the Maxim chip to drive the leds you connect them as shown in table 1 and send data and commands serially as described in the chip documentation.

    The major difference between the way the maxim chip drives the display and the way it is usually done is that they use Q0 - Q7 to drive the anodes (digit select) when they are high, and the cathodes (segment) when they are low. This allows them to multiplex 8 digits with 19 pins instead of the 25 pins (16 segments, 1 dp, 8 digit selects) it would take the old way.
  • BADHABITBADHABIT Posts: 138
    edited 2009-05-22 22:48
    Does anyone have more than this?
  • Mike HuseltonMike Huselton Posts: 746
    edited 2009-05-23 00:08
    Do you want a completed program? Is what you are asking for is someone to do the work for you?

    BADHABIT indeed.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    JMH
  • kwinnkwinn Posts: 8,697
    edited 2009-05-23 03:48
    Do you want to use the 16 segment displays only, or do you want to use them with the Maxim chip?
  • BADHABITBADHABIT Posts: 138
    edited 2009-05-23 06:16
    just the displays. I won't have the chips for a week or 2
  • kwinnkwinn Posts: 8,697
    edited 2009-05-23 13:11
    Try connecting one display chip up like this. Outputting a one to the prop pin will light up the segment connected to that pin. Be aware that connecting it this way is very different from how it will connect and programmed using the Maxim chip.
  • hover1hover1 Posts: 1,929
    edited 2009-05-23 13:39
    BADHABIT said...
    just the displays. I won't have the chips for a week or 2
    Chris Savage wrote a little routine:

    http://forums.parallax.com/showthread.php?p=790643

    OBC also wrote one here:

    http://forums.parallax.com/showthread.php?p=745806

    Jim
  • BADHABITBADHABIT Posts: 138
    edited 2009-05-23 19:26
    Thanks Hover1, that's a huge help. It pretty much has everything I need.



    Damn things take up alot of I/O, will def be using driver chips to cut that down.



    How's that completed object coming along Mr. Savage?
  • hover1hover1 Posts: 1,929
    edited 2009-05-23 19:48
    BADHABIT said...

    Thanks Hover1, that's a huge help. It pretty much has everything I need.



    Damn things take up alot of I/O, will def be using driver chips to cut that down.



    How's that completed object coming along Mr. Savage?

    Yea, and·it takes about $10.00 worth of copper to wire it up tongue.gif

    The MAX6954 is on my list of "to buy" stuff for a project that's out about a month or so.

    Jim
  • BADHABITBADHABIT Posts: 138
    edited 2009-05-24 00:33
    you can get maxim samples @

    www.maxim-ic.com
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