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Thread: So I cant get my simple LCD to work... :(

  1. #1
    Newbie
    Join Date
    Jul 2002
    Posts
    9

    So I cant get my simple LCD to work... :(

    Yes this has been asked before, I just couldnt find a suitable responce that fit my condition. I have a 24x2 lcd that I cant get to print. It is hooked up to my pararlel port using the pop. pinout diagram. This should be correctly references as I double checked it to my port pinout that came with the display. Anyway when I power it up I get the standard go signal, black boxes accross the top- but I cant get my computer to do anything on it. Not even produce garbage. Ive been trying to use lcdprint. I boot to 98 type command: lcdprint 378 it then says that my port is there. THen I type lcdprint 378 24 2 mytext.txt (i mae a textfile and placed it in my home directory, it just returns me to the dos prompt with no responce from the screen, am I missing something here? the other person who got this display (http://www.allelectronics.com/cgi-bi...-74&type=store) seemed to be doing the same thing I am and got it working! So am I missing anything? Is this a software problem or should I try and rewire? Thanks for helping me out,
    Eben

  2. #2
    Variable Bitrate
    Join Date
    Apr 2002
    Location
    Charlotte, NC
    Posts
    315
    I'm having the same EXACT problem, but mines 40x4. Heres a bump for ya.
    Silver 1999 Nissan Pathfinder!
    Completion: [*********-] 90%
    Everything working! Mobile MP3s ROCK!
    LEFT TO DO: Improve power on circuit, fix slow boot time

    - 550mhz PIII on Abit BH6
    - 128MB RAM
    - 40x4 Backlit Character LCD
    - 17 key numeric keypad - Repainted buttons
    - 2.1GB laptop drive for OS
    - 4.3GB drive for MP3s

    http://www.mp3car.com/usersites/bombboyer/ Redesigned, new pics!

  3. #3
    Maximum Bitrate
    Join Date
    Jun 2001
    Location
    Boise, ID (USA)
    Posts
    551
    most common problem is wiring mistakes! Double check with continuity checker...

  4. #4
    Newbie
    Join Date
    Jul 2002
    Posts
    9

    Angry twister

    Still no luck... I checke dall the connections, three times over at three different sititngs (just in case of brain fog) I cant find any soulution! The only thing I dont have insatlled are the two resistors (ones a variable 10k and the other is a fixed 100k but its for pin 16 that i don thave anyways so I dont know on that one. ) So am I stuck? Where else should I look? I know someone from that website apparently got this up and runnignwithno trouble. Ive got all night so im up for any suggestions (no matter how timely)
    Thanks!!
    E

  5. #5
    Maximum Bitrate
    Join Date
    Jun 2001
    Location
    Boise, ID (USA)
    Posts
    551
    do you have a link to the wiring diagram you are using?

  6. #6
    Newbie
    Join Date
    Jul 2002
    Posts
    9
    I first tried this one : http://lorty.mp3car.com/lcdcorrect_eio.jpg but that didnt seem to work since my display has fewer connectors so I switched to a similier one that wires port 1 to port 6(e) and the other sequentially from that. Reflecting on that it doesnt really mkae sence since theseprogarms must be based on the same general wireing- im going to go and try to wire it up using the one i just posted!Thanks ill be back ina sec!
    E

  7. #7
    Newbie
    Join Date
    Jul 2002
    Posts
    9
    well it turns out they hook up the same. Pin 1 for me is just Vss. and my data channel starts at pin 6 (e) so it lines up straight accross....and yet my display will not respond. Sigh. Any other thoughts?

  8. #8
    Maximum Bitrate Raas's Avatar
    Join Date
    Jan 2001
    Location
    The Netherlands
    Posts
    626

    you need resistors

    Hi,

    i once was having these probs on my 4x40 too.
    Seems you have to turn the contrast all the way up in order to see anything on the display..
    I had the same symptoms.. triple checked everthing, and again and again, but everything seemed right.. untill I started to play with the resistor for the contrast.
    suddenly, the characters became visible on the lcd.. and is working great since then.

    hope this helps you out.

    Greetz,

    Raas
    Raas - The Netherlands
    ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
    GF: IBM Thinkpad 380, ext. 3.5 80gb, 40x4, PB-IR

  9. #9
    Newbie
    Join Date
    Jul 2002
    Posts
    9
    Thank you! IM anxious to try this though I cant till later this weekend. Would this contrast thing still apply since I see black boxes on the toprow?

  10. #10
    Variable Bitrate
    Join Date
    Apr 2002
    Location
    South Coast, UK
    Posts
    437
    No, sorry. The black boxes are the equivelent of characters being displayed. If you can see them, you will be able to see other output as well.
    -------------------------------------------
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    Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
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