LCD strange character and no text

Hello, I have a problem trying to show text on my LCD.
I have already tested several ways to show and several codes but it always shows strange characters. Sometimes I even get it right in one letter or another, but I never got it to show that the text is all correct.
I have already checked the panel welds and none of them appear to be shorted.

VSS- GND
VDD- 5v
VO-potentiomter
RS-pin 12
RW-GND
E-pin 11
D0-
D1-
D2-
D3-
D4-pin 5
D5-pin 4
D6-pin3
D7-pin2
A-5v
K-GND


type or paste code here
//Carrega a biblioteca LiquidCrystal
#include <LiquidCrystal.h>
 
//Define os pinos que serão utilizados para ligação ao display
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
//LiquidCrystal lcd (2,3,4,5,11,12);
 
void setup()
{
  //Define o número de colunas e linhas do LCD
  lcd.begin(16, 2);
}
 
void loop()
{
  //Limpa a tela
  lcd.clear();
  //Posiciona o cursor na coluna 3, linha 0;
  lcd.setCursor(3, 0);
  //Envia o texto entre aspas para o LCD
  lcd.print("FILIPEFLOP");
  lcd.setCursor(3, 1);
  lcd.print(" LCD 16x2");
  delay(5000);
   
  //Rolagem para a esquerda
  for (int posicao = 0; posicao < 3; posicao++)
  {
    lcd.scrollDisplayLeft();
    delay(300);
  }
   
  //Rolagem para a direita
  for (int posicao = 0; posicao < 6; posicao++)
  {
    lcd.scrollDisplayRight();
    delay(300);
  }
}

as your pictures don’t show the wiring, the only guess is:

  • the wiring is not correct.

Todo: double check your wiring.
After your check and correction, make a table which pin is used for what and which wire color is used and upload pictures were we can clearly see each and every connection. Use different colors to make the routing visible.
Example

LCD_PIN  ARDUINO_PIN  COLOR
E        42           white

if we get a correct table and good pictures, one will be able to help you.
But for 99% probability, you will find the mistake on your own during the preparation of good information.

I gave update with new photos.
I have already reviewed the wiring several times and it is correct.
But I write here how it is connected

VSS- GND
VDD- 5v
VO-potentiomter
RS-pin 12
RW-GND
E-pin 11
D0-
D1-
D2-
D3-
D4-pin 5
D5-pin 4
D6-pin3
D7-pin2
A-5v
K-GND

im still missing the color table.
Where is the GND connection between Arduino and LCD and or breadboard?

the GND connection is made through Breadboard. I have chain in it (third photo).
The colors of the wires were the wires that came to me, but I sent the table for each connection where it is connected.

there is no GND connection between Arduino and the other devices.

picture 3 shows
2,3,4,5,11,12 connected.
No GND.

Swap the jumper wires to D4 to D7 with ones that have been tested. I should not be surprised if the “D7” (yellow) wire was broken.


By the way, in the English language, we solder connections, not “weld” them. :grin:

Sorted out. I had a problem like using a servant and now I didn’t remember that detail. Thank you very much.

fine.
Then we can talk about something different: you don’t need to connect the contrast potentiometer to VDD. Connect both ends to GND and the wiper to the LCD-V0

Could you explain that in more detail? What exactly was the problem?

Hi
The problem is solved. forgot to connect the GND to the motherboard
thank you all