schematic for 8051 interfaced with LCD

Discussion in 'Embedded Systems and Microcontrollers' started by BrendanCarroll, Jan 20, 2009.

  1. BrendanCarroll

    Thread Starter New Member

    Jan 20, 2009
    Hello everyone

    I am currently trying to interface a 2 x 40 LCD with an 8051 microcontroller. Not too sure if my layout is correct as I have three different layouts at this stage. I am designing this in Proteus (ISIS) and cannot get any text to the LCD module. I have tried various codes but I'm afraid if the layout is incorrect then the code will be useless.
    I have also attached all three attempts !!!
    I would greatly appreciate any help on this matter.

  2. jnvarsha

    New Member

    Jan 21, 2009
    Hi,I went through ur first attempt of schematic & found that there is some connection issue that is ur hardware needs to be modified .In ur schematic the LCD pins r not connected properly. In LCD, named pins must be connected as follows: Pin RS- port 2.0 pin R/W- port 2.1 Pin E- port 2.2 just check this c
  3. BrendanCarroll

    Thread Starter New Member

    Jan 20, 2009
    Thanks for your reply and help on this matter. I have made relevant
    changes to this circuit design and re-did the code. The LCD is now displaying text.
    Do you know how to place a character in a certain column on the LCD.
    I have attached the new diagram and code.
    Again I just want to say thanks a million for all your help.

  4. Arm_n_Legs

    AAC Fanatic!

    Mar 7, 2007
    To place character is certain column or location. Move the cursor by shifting command into the command register.

    RS=0; // Set to command register
    P0=0x85; // 5th position
    strobe(); // Strobe the data
    RS=1; // Switch to Data Register
    P0=0x41; // Print A
  5. BrendanCarroll

    Thread Starter New Member

    Jan 20, 2009
    Thanks for the help with this.
    Unfortunately the code will not run onto the second line which is what I'm after.
    I will attach a copy of the code as I have updated all changes.

    Thanks again all