New LCD Screens with no part numbers.

Discussion in 'General Electronics Chat' started by kbyrne, Oct 8, 2016.

  1. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    I just bought two LCD screens that were advertised as double digits with decimal points only to have them arrive at
    $1.00 each. My question is how do I set them up on bread board as they have 9 pins each side. I need advise as I am new to LCD screens and 330ohm resistors are used a lot on my schematics but what is the proper way to do this with no data sheet due to no part number? Can any body show me the proper way so I can use them in a circuit design?
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Do the pins has labels, such as D1, D2..., E, and so forth?

    John
     
  3. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    Not that I can see with bad eye sight with glasses on, but of course. Clear plastic on front with clear plexiglass under neath. Pins are silver in color. .100 on centers, fit into pin headers real nice of the stackable type.
     
  4. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    The labels, if any, should be on the PCB. Like this:
    upload_2016-10-8_12-20-31.png

    Not all displays have them. The order is fairly standard, so if you can find a 9-pin display that is labeled, you could try using those labels.

    John
     
  5. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    They sound more like 7 segment LEDs. You can deduce the connections with the diode test on a multimeter.
     
  6. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Can you show us a picture of the displays?
    That way we can tell if they are LCD or LED.

    Bertus
     
  7. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    These LCD displays have 16 pins as you can see in this picture. So far as I know none of these have only two characters.
    The TS says "9 pins on each side" (total 18 pins) and "double digits with decimal points". For two digit 7 segment LEDs there would be 7 pins for the segments plus one for the decimal point, for each digit, plus the two anodes or cathodes making a total of 18 pins.
     
  8. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    Enclosed are two pics of new displays. All Corporation listing Cat# LCD-200. REF 1801479 Ln#5 LOC L3-3?
     
  9. AlbertHall

    Well-Known Member

    Jun 4, 2014
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    Cancel all my previous, they are definitely LCDs. I know LCDs don't like DC but does anyone know if you can establish the connections in a similar way to LEDs with a multimeter?
     
  10. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    There is a small bump on the right side of display with some tan paint. Will that tell which side goes up?
     
  11. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Those are bare LCDs. You need a driver chip to make a module. Some ADC chips could do it if it is a two-digit display. Some microcontrollers can do it to.
     
  12. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    Can you tell me which ADC chip not a microcontroller to get a data sheet for?
     
  13. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    Advertised as double digit by a small corporation. Screens themselves measure at 1.100 in wide times .900 in high.
     
  14. GopherT

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    Nov 23, 2012
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    kbyrne likes this.
  15. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    Will do. They are supposed to be dual digit with decimal points.
     
  16. kbyrne

    Thread Starter Member

    Dec 10, 2011
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    GopherT likes this.
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