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Thread: HELP!! Confused!! 4x40 lcd help needed

  1. #1
    Join Date
    May 2002

    HELP!! Confused!! 4x40 lcd help needed

    Ok, so I do not get it at all. Seek help from all you gurus here reading this forum. I got the bug I have 60 gigs of mp3s playing perfectly in my I want to hook up an lcd display. I have a 4x20 and a densitron 4x40 both are hd44780 compatible. I haven't a clue what to do now. I am seeing a schematics floating around for a 4x20 and one for a 4x40.... Is a 4x20 lcd the same regardless of who makes it? I hooked the 4x40 up and got the 2 black bars but nothing else...close but no cigar huh? any tips/tricks/hints....ANYTHING would be appricated!!! I know it will be cool...just gotta figure out how to do it.


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  2. #2
    Maximum Bitrate Raas's Avatar
    Join Date
    Jan 2001
    The Netherlands

    First off all.. a question.. how do you manage your mp3's without a display.. Are they all stored in a gigantic playlist ???

    No.. the schematics for a 4x20 and 4x40 are no the same.
    4x40 uses a seconc enable line (e2) to enable the 2nd controller chip (44780)
    One controller chip is good for 80 character.. therefore the 4x40 have 2 of these.

    the 2 bars (1 and 3 ) on a 4x40 indicate that you have properly wired-up your display. It works..
    Reason you don't get anything on the display is because you have to tell your pc to write data to the parallel port. (If you don't get any bars, check the contrast, and the wiring.. I've gone bezerk over my lcd not working.. checked wiring 6 times to find out in the end my contrast was zero, so nothing to read)

    You can test this easily with a dos-proggie called LCDPRINT, do a search for it on google, and it show up.
    It's a nice proggie where you select a text-file to be 'printed' on the lcd.

    When you have tested this, and it all works out. (no garbage on lcd, otherwise check your wiring), then you can head on a search for some visual-plugins for winamp.
    I recommend the Markus Zehnder Plugin because this one supports playlists, is easy configurable, and totally customizable (??spelling??)
    You have to install these plugins into the winamp plugin directory and configure them..

    If lcdprint like you wanted it to work, then you now should be able to view the mp3-tag information on your display !!!!

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

  3. #3
    Join Date
    May 2002
    Thank you a million!! I was so close and I un soldered the whole thing...oh well...back at it! I am using a palm pilot right not to pick and play songs...all of them in one giant playlist. works...stick winamp on shuffle and awway you go.

    thanks again for the help...time to hit the laboratory once again!!


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