LCD4884 Arduino Mega 2560

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1

Hello, this is my first post on the Arduino forms, so please go easy on me. I started learning the Adruino 2 years ago and since then I have built many projects with great success, thanks to these forms and Google; however, I am stuck now.

I just bought the LCD4884 shield and I cannot get it working no matter what I do.

I have installed the library for the LCD4884 and everything uploads just fine and my backlight turns on but text is not displayed. I have tried previous versions of the IDE but nothing seems to work, its almost like the contrast is too low and I do not know how to change it.

#include <LCD4884.h>
 
int z=0;
int dd=200;
 
void setup()
{
  lcd.LCD_init(); // creates instance of LCD
  lcd.LCD_clear(); // blanks the display
  pinMode(7, OUTPUT);
}
void loop()
{  // first some text display
lcd.LCD_write_string(0,0,"01234567980123", MENU_NORMAL);
delay(1000);
  for (int a=0; a<5; a++)
  {
    digitalWrite(7, LOW);
    delay(300);
    digitalWrite(7, HIGH);
    delay(300);
  }
  for (int a=0; a<6; a++)
  {
    lcd.LCD_write_string(0,a,"01234567980123", MENU_NORMAL); // ignore MENU_NORMAL for now
    delay(dd);
  }
  delay(dd);
  lcd.LCD_clear();   // blanks the display
  delay(500);
  lcd.LCD_write_string_big(0, 0, "012345", MENU_NORMAL);
  lcd.LCD_write_string_big(0, 3, "-+-+-+", MENU_NORMAL);
  delay(1000);
  lcd.LCD_clear();  // now to read the joystick using analogRead(0). Press RESET whien finished
  do
  {
    z=analogRead(0);
    if (z==0)
    {
      lcd.LCD_write_string(2,2,"Down", MENU_NORMAL);
    }     
    else
      if (z>0 && z<150)
      {
        lcd.LCD_write_string(2,2,"OK   ", MENU_NORMAL);
        delay(dd);
      }       
      else
        if (z>150 && z<350)
        {
          lcd.LCD_write_string(2,2,"Right", MENU_NORMAL);
          delay(dd);
        }         
        else
          if (z>350 && z<510)
          {
            lcd.LCD_write_string(2,2,"Up   ", MENU_NORMAL);
            delay(dd);
          }         
          else
            if (z>510 && z<750)
            {
              lcd.LCD_write_string(2,2,"Left ", MENU_NORMAL);
              delay(dd);
            }           
            else
              if (z>750)
              {
                lcd.LCD_write_string(2,2,"nil  ", MENU_NORMAL);
                delay(dd);
              }
  }  
  while (1>0);
}

I have tried many different example sketches with no luck, I am starting to think I should have purchased a different LCD screen.

Any suggestions or tips would be greatly appreciated.

Thanks.

2

BAM! never mind. the LCD screen was greasy, something from the factory or something, I red that in a post and after tearing it right apart and cleaning it its now working :slight_smile: