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Thread: Interfacting 4x40 HDD780 LCD with Printer port (Parallel Port)

  1. #1
    Maximum Bitrate Jarrod's Avatar
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    Post Interfacting 4x40 HDD780 LCD with Printer port (Parallel Port)

    I have just bought a 4x40 EL backlight LCD, and I have all the pinout information as listed below, but I still have NO idea how to interface it with my Printer Port. Please help me.
    Pinouts:
    --------
    1 = switch (GND on switch closure)
    2 = EL backlight
    3 = EL backlight
    4 = LCD bias (appr. -2.5V)
    5 = 44780 Register Select
    6 = 44780 R/W
    7 = 44780 enable IC1 (top 2 rows)
    8 = 44780 enable IC6 (bottom 2 rows)
    9 = Vcc
    10 = N/C
    11 = N/C
    12 = Gnd
    13 = D0
    14 = D1
    15 = D2
    16 = D3
    17 = D4
    18 = D5
    19 = D6
    20 = D7

    Can anybody help me out with a wiring diagram or any information? Thank You.
    Jarrod - Holden VX S!

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  3. #3
    Maximum Bitrate Jarrod's Avatar
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    I have already tried to search existing posts, but as you should be able to tell, my pinouts are completely different to those on all the schematics that other people have used. So can anyone ELSE help me?
    Jarrod - Holden VX S!

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    This is the same position i am in, I found this....
    http://www.mswanson.com/~nstuart/lcd/WinLCDhardware.htm
    "A4 Quattro. Rocket Science."

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    Maximum Bitrate Jarrod's Avatar
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    Thanx, but that diagram doesnt help me, it's the same as all the other ones I've seen....anyone else?
    Jarrod - Holden VX S!

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    Dude I'll post the coresponding pins that will match normal layout that we have with standard LCD screen...
    Only thing im at work now and i cant do it until i get home.
    Check this this BB later on tonight.

    [ 01-31-2002: Message edited by: Fosgate ]
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

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    Maximum Bitrate
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    Sorry dude had some problem with internet last night... Will try to do it tonight.
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  8. #8
    Maximum Bitrate Jarrod's Avatar
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    Can anyone please help me as I am sort of in a hurry.
    Jarrod - Holden VX S!

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    1 = switch (GND on switch closure)
    2 = EL backlight
    3 = EL backlight
    4 = LCD bias (appr. -2.5V)
    5 = 44780 Register Select
    6 = 44780 R/W
    7 = 44780 enable IC1 (top 2 rows)
    8 = 44780 enable IC6 (bottom 2 rows)
    9 = Vcc
    10 = N/C
    11 = N/C
    12 = Gnd
    13 = D0
    14 = D1
    15 = D2
    16 = D3
    17 = D4
    18 = D5
    19 = D6
    20 = D7

    1 - > 13
    2 - > EL Backlight around 100V AC
    3 - > EL Backlight around 100V AC
    4 - > -2.5v To drive the LCD
    5 - > 11
    6 - > 10
    7 - > 9
    8 - > 15
    9 - > 14
    10 - > N/C
    11 - > N/C
    12 - > GND pin 13
    13-20 - > 1 to 8

    Well here it is. Its pretty simple really
    on the left side is your LCD on the right its the standard pin out.
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  10. #10
    Maximum Bitrate Jarrod's Avatar
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    thanx alot, but are you 100% sure those are the correct pinouts? because all the other 40x4 schematics say that R/S should go to pin 16 of the parallel port and you say it should be 11? It just doesnt seem right to me.
    I have another question:
    Where am I supposed to get 100V AC from and -2.5V (DC or AC?) in order to connect my LCD to parallel port and run it in the car?

    [ 02-01-2002: Message edited by: Jarrod Bell ]
    Jarrod - Holden VX S!

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