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4 x 40 lcd (PARALLEL) — Parallax Forums

4 x 40 lcd (PARALLEL)

Brian CarpenterBrian Carpenter Posts: 728
edited 2006-06-14 04:13 in General Discussion
I bought a few of these.· http://www.allelectronics.com/cgi-bin/item/LCD-112/search/40_X_4_LCD_DISPLAY_.html
From allelectronics.· they are parallel.· Is there any place someone cand send me to help me make an sx talk to these?

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Comments

  • BeanBean Posts: 8,129
    edited 2006-06-02 11:00
    Look at the LCD example in the SX/B help file. It says "Serial LCD" but it is actually a project to create a serial interface to a parallel LCD.

    Bean.

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    Cheap 4-digit LED display with driver IC·www.hc4led.com


    COMING SOON "SD DATA LOGGER" www.sddatalogger.com

    "I reject your reality, and substitute my own." Mythbusters
    ·
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2006-06-02 13:23
    this is for a 2 x 16. how much trouble will i have making it work with a 4 x 40?

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  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-06-02 15:19
    Hello,

    ·· The concept will be the same...That is, communicating and sending commands...One thing to be aware of with 4X40 Parallel LCDs is that the Hitachi Compatible ones use dual-controllers for that size.· Usually the display is split up in a strange way such that lines 1 and 3 are on the first controller and lines 2 and 4 are on the second controller.· In any event to use them all you will need to handle two enable lines to access the full display.· I hope this helps.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • SawmillerSawmiller Posts: 276
    edited 2006-06-02 23:27
    or you could go to this site ...



    http://www.phanderson.com/
    ·and get his lcd kit #117

    its a serial to parallel converter for about 5 dollars... has also a BIG NUMBER mode for 4 X 20's
    i have several 4 x 20's off ebay and i've hooked them up in parallel with my sx tech board and have hooked them up with his lil chip so i could use them as serials..... fun learning both ways
    dan
    ·
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-06-03 00:46
    Dan,

    ·· I have a few of these kits, but I don't recall them supporting dual-controller displays such as the 4X40 LCD Displays.· If not he wouldn't be able to use that chip.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2006-06-03 01:25
    Does anyone know if that will work?

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  • SawmillerSawmiller Posts: 276
    edited 2006-06-03 02:23
    your right , he says that the #117 kit will support 4 X 20, not 4 X 40....
    sorry...
    i'm sure you could hook it up to the sx....
    qiuck look at the pdf file shows 2 enable lines
    dan
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-06-03 03:24
    Yeah 4X40 LCD Displays are the tough ones because of the extra Enable line and the often weird layout.· I checked and I do have three of the LCD #107 kits and two #106 kits.· I never used them since I had been using the PIC-an-LCD for many years.· Don't really use either anymore, but I still have the parts.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • John CoutureJohn Couture Posts: 370
    edited 2006-06-07 17:28
    altitudep,

    These look like interesting modules. Give me a week or two to order some so I can play around with them.

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    John J. Couture

    San Diego Miramar College
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2006-06-07 20:04
    Thanks John. You guys are the best!

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • Direct Digital LabsDirect Digital Labs Posts: 27
    edited 2006-06-09 21:25
    Here is a simple "driver" I quickly threw together for these amazingly cheap displays using an SX48.

    It includes code for using all 8 custom characters.
    ·
    ·Cheers,scool.gif

    -Dan
    src
    src
    Character LCD Driver (40x4).src
    12K
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2006-06-09 23:38
    could you show a schematic of the sx to lcd connections?

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  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2006-06-09 23:42
    how did the display look? was it visible without a backlit?

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  • Direct Digital LabsDirect Digital Labs Posts: 27
    edited 2006-06-10 02:35
    · "could you show a schematic of the sx to lcd connections?"
    The pin connection is in the code but here is the LCD pin to SX connection. If you need an actual schematic I can make one for you.
    LCD············ SX
    ·1············· RB7
    ·2············· RB6
    ·3············· RB5
    ·4············· RB4
    ·5············· RB3
    ·6············· RB2
    ·7············· RB1
    ·8············· RB0
    ·9············· RA2
    10············· RA1
    11············· RA0
    12············· thru 10K pot to GND
    13············· GND
    14············· +5V
    15············· RA3
    16············· N/C
    17············· N/C
    18············· N/C
    Attached is a picture of how the LCD looks.
    -Dan
    40x4.jpg
    1024 x 768 - 272K
    40x4.jpg 271.5K
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2006-06-10 04:55
    this is great Dan. Thanks

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2006-06-14 04:13
    wow so i was so excited, but didnt get a chance to work with it all weekend.· Finally, today was the day.· Plugged every thing into my ProDev Board and the darn thing wont program....· Wow,· Looks like i need to get some sleep.· You specifically said that it ws for the sx48 and the dev has a 28.· I just ordered an sx48 proto board.· thanks again Dan

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