LCD4Bit problem

Using Arduino Displays
1

I use KS0073 Display 20x4. See this video

Lib LCD4Bit

RS -> 12
RW -> 11
E -> 2
D7 -> 10
D6 -> 9
D5 -> 8
D4 -> 7

2

You've been around for over a year.
You should know by now you didn't provide enough information to have us guess what your problem is about.

So nice sketch, printing 3 dots one after the other after each random print.
Can you share your sketch so others can enjoy this too, and maybe add some more efects ?

3

Why are you not using the standard LiquidCrystal library available here: ?

Post your code and a photo of youir wiring ...

4

The LCD4bit library is obsolete and unneeded. It is also poorly written by someone who didn't completely understand the operation of the HD44780U controller. Just read the comments and you will see what I mean.

Don

5

raschemmel:
Why are you not using the standard LiquidCrystal library available here: ?
http://arduino.cc/en/Tutorial/LiquidCrystal
Post your code and a photo of youir wiring ...

Blue Wire is Display RESET. Don't know where to.

examples\HelloWorld

Changed in lcd.begin(20,4);

6

If i use LiquidCrystal440. This result. Because LCD 40x4 works. I think, 20x4 will works too.

#include <LiquidCrystal440.h>

LiquidCrystal lcd(13,12,11, 5,4,3,2); //RS, RW, E, D4, D5, D6, D7

void setup() {
  lcd.begin(20,4);
  lcd.clear();
  
  lcd.setCursor(0,0);
  lcd.print("Line1");
  lcd.setCursor(0,1);
  lcd.print("Line2");
  lcd.setCursor(0,2);
  lcd.print("Line3");
  lcd.setCursor(0,3);
  lcd.print("Line4");  
}

void loop() {
}

//Alternate interfaces to test for 2x16,4x20,4x16:
//LiquidCrystal lcd(49,47,45, 35,33,31,29); // rs,rw,en, 4 data pins remember to set rw = 255 above
//LiquidCrystal lcd(49,47,45, 43,41,39,37, 35,33,31,29); // rs,rw,en 8 data pins remember to set rw = 255 above
//LiquidCrystal lcd(49,45, 35,33,31,29); // rs,en, 4 data pins remember to set rw = 47 above
//LiquidCrystal lcd(49,45, 43,41,39,37, 35,33,31,29); // rs,en 8 data pins remember to set rw = 47 above