NHD-0420E2Z-NSW-BBW is displaying Japanese Characters instead of my string

shaneyost

• June 02, 2014 09:07

I'm trying to display the string "ABCD" for starters on this LCD NHD-0420E2Z-NSW-BBW. However, the LCD displays Japanese related characters. Instead of creating another discussion for the 5th time and i'm going to point you to the link where one of my discussions is located. You will find pictures, code and even the data sheet to my LCD. Any ideas on how to fix this. It seems it is getting the upper 4 bits wrong in the data byte. I checked my wiring and from what i can tell everything is wired correctly. My arduino code is the only thing that I can think of that could be causing this issue. However, now i'm wondering if my wiring is wrong somewhere. Please refer to the following link.

http://stackoverflow.com/questions/23999145/lcd-outputs-chinese-characters-instead-of-alphanumeric

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• 

  Michael_L

  • June 03, 2014 09:07

  Hi Shane,
  
  Did you receive my response to your email yesterday regarding this?  I will copy it and post it below just in case you did not:
  
  That Arduino library is written for Hitachi HD44780 controller, whereas our display uses the Sitronix ST7066U.  There are some minor timing differences between the two controllers, which can be seen in their respective datasheets. However, I have used this library with our displays before, but I believe it was using an 8-bit interface.  The problem here is not our display but in fact the library you are using.  If it’s possible, try using an 8-bit interface with that library, otherwise you may refer to the attached 4-bit interface Arduino code I have for our 4x20 character displays.
  
  Note:  in the code you will see it mentions “character OLED” display, but the code works for our LCDs as well (I just tested it again to be sure).

  //---------------------------------------------------------
  /*
  NHD_0420DZW_mega.ino
  Program for writing to Newhaven Display 4 x 20 Character OLED (4-bit, 6800 mode)
  
  (c)2014 Michael D. LaVine - Newhaven Display International, LLC.
  
          This program is free software; you can redistribute it and/or modify
          it under the terms of the GNU General Public License as published by
          the Free Software Foundation; either version 2 of the License, or
          (at your option) any later version.
  
          This program is distributed in the hope that it will be useful,
          but WITHOUT ANY WARRANTY; without even the implied warranty of
          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
          GNU General Public License for more details.
  */
  //---------------------------------------------------------
  
  // The 4 bit data bus is connected to PORTD[3..0] of the Arduino Uno
  
  int RS =  9;     // RS signal connected to digital pin 9
  int RW =  10;    // R/W signal connected to digital pin 10
  int  E =  11;    // E signal connected to digital pin 11
  
  const char text1[] = {"  Newhaven Display  "};
  const char text2[] = {"   Character OLED   "};
  const char text3[] = {"  4 Line x 20 Char  "};
  const char text4[] = {"0123456789!@#$%^&*()"};
  
  void toggle()
  {
     digitalWrite(E, HIGH);
     delay(1);
     digitalWrite(E, LOW);
  }
  
  void command(char c)
  { 
     PORTD = (c>>4);
     digitalWrite(RS, LOW);
     toggle();
     PORTD = c;
     toggle();
  }
  
  void data(char d)
  {
     PORTD = (d>>4);
     digitalWrite(RS, HIGH);
     toggle();
     PORTD = d;
     toggle();
  }
  
  void disp()
  {
     int i;
     delay(50);
     command(0x02);  //Home Command  [Set DDRAM address to Line 1 position 1]
     delay(5);
     for (i=0;i<20;i++)
     {
        data(text1[i]);
     }
     command(0xC0);  //Second Line  [Set DDRAM address to Line 2 position 1]
     for (i=0;i<20;i++)
     {
        data(text2[i]);
     }
     command(0x94);  //Third Line  [Set DDRAM address to Line 3 position 1]
     for (i=0;i<20;i++)
     {
        data(text3[i]);
     }
     command(0xD4);  //Fourth Line  [Set DDRAM address to Line 4 position 1]
     for (i=0;i<20;i++)
     {
        data(text4[i]);
     }
  }
  
  void setup()
  {
     DDRD = 0xFF;    //set PORTD (data bus) as output
     PORTD = 0x00;   //initialize PORTD to 0x00
     DDRB = 0xFF;    //set PORTB (control lines) as output
     PORTB = 0x00;   //initialize PORTB to 0x00
     delay(5);
     toggle();
     delay(5);
     PORTD = 0x2;
     toggle();
     command(0x28);
     PORTD = 0x0;
     toggle();
     PORTD = 0x8;
     toggle();
     PORTD = 0x0;
     toggle();
     PORTD = 0x1;
     toggle();
     delay(5);
     PORTD = 0x0;
     toggle();
     PORTD = 0x6;
     toggle();
     PORTD = 0x0;
     toggle();
     PORTD = 0x2;
     toggle();
     PORTD = 0x0;
     toggle();
     PORTD = 0xC;
     toggle();
     delay(10);
  }
  
  void loop()
  { 
    disp();
    delay(3000);
  }

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