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AMC board + LCD

Discussion in 'New users start here - FAQ' started by stowaway, Jun 13, 2009.

  1. stowaway

    stowaway New Member

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    Well, Im happy to say ive made progress on my AMC board (thanks tronic and others)

    I found a short in my board, and now i get the 2 lcd lights lighting up, i am able to program the chip and everything is working great!

    HOWEVER.. the LCD i just bought and connected lights up but nothign is on it.. no blocks. nothing.. althoug hte back light is on.

    I just solidered the wires according to the LCD datasheet to the corraspoding spots on the AMC board. (ie the VCC to VDD, 0 to ground, db4 to db4 ect ect ect)

    Can anyone give me hints on the LCD?
    stowaway, Jun 13, 2009
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  2. stowaway

    stowaway New Member

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    I just noticed in the schematic that the LCD has some sort of board.. Is there any info on making this board?

    the first picture below is from the sacamtic that tronic made.. The second i the schematic how my lcd is currently attached.

    notice on my the RW is not connected.

    lcd1.jpg

    lcd2.jpg
    stowaway, Jun 14, 2009
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  3. tronicgr

    tronicgr

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    Hi,

    The R/W of the LCD should be connected to Ground... !!

    If you still have problems with it take a look in this post on how to power the backlight directly from the powersupply, and use a potentiometer to fix the contrast (needed for most Blue LCD's...!)

    post13837.html#p13837

    Regards, Thanos
    tronicgr, Jun 14, 2009
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  4. stowaway

    stowaway New Member

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    i have now connected R/W to ground.

    I am still getting the same problem. The back light comes on but nothing else. (no blocks or anything)

    I will try connecting a pot to it as in ur post, however it is not a blue LCD its a standard Green one..

    I also tried connecting A to +v nd K to gnd. however this didnt do anything differnet. (i didnt think this was the problem as the back light was coming on)

    i am using this lcd:

    http://www.jaycar.com.au/productView.as ... rm=KEYWORD


    next step for me. (for the weekend coming) create the board with the pot.

    - Just an update. Since its not a blue LCD (its a green one) im assuming its not the pot issue..
    I currently have the Contrast pin N/C to anything. I'll connect it to groudn and see how that goes.
    stowaway, Jun 14, 2009
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  5. stowaway

    stowaway New Member

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    wahoo

    Wahoo, I figured it out.

    I didnt have the contrast pin set to 0. It works now.

    for those noobs (like me) who might have problems with their LCD this is the wiring i did to get mine to work.

    Im onto the next step now!!! :) correct lcd.jpg
    stowaway, Jun 15, 2009
    #5