I want tried to make a programm to display a text on an I2C LCD-Display. The text should be scrolled for one position every time the function is called.

On the internet I saw a lot of solutions but there were all diffrent from what I need.

So I tried to make my own code. The code works well except of the part where I try to scroll in the Text from the left.

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 16, 2);

char Str[12] = {'T', 'r', 'u', 'e', 't', 'z', 's', 'c', 'h', 'l', 'e', 'r'};
int pos = 0;
int posretry = 0;
bool ledon = false;



void setup()
{
  pinMode(13, OUTPUT);

  lcd.init();
  lcd.backlight(); //lcd.noBacklight();
}

void scroll()
{
  for (int i = 0; i < 12; i++)
  {
    //Print text
    lcd.setCursor(i + pos, 0);
    lcd.print(Str[i]);

    //Move in text from the left

    if (pos >= 6)
    {
      lcd.setCursor(i + pos, 0);
      lcd.print(Str[i]);

      lcd.setCursor(posretry, 0);
      lcd.print(Str[11 - posretry]);

      posretry++;
    }
  }
  delay(500);
  lcd.clear();

  pos++;
}

void changeled()
{
  if (ledon == false)
  {
    digitalWrite(13, LOW);
  }
  else
  {
    digitalWrite(13, HIGH);
  }

  ledon = !ledon;
}

void loop()
{
  scroll();
  changeled();  //Example Event
}

The goal is to move the text to the right and show the not displayed letters on the left.

Example:

|er    Truetzschl|  -->
|                |

Thanks for your help.

I want tried to make a programm to display a text on an I2C LCD-Display. The text should be scrolled for one position every time the function is called.

On the internet I saw a lot of solutions but there were all diffrent from what I need.

So I tried to make my own code. The code works well except of the part where I try to scroll in the Text from the left.

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 16, 2);

char Str[12] = {'T', 'r', 'u', 'e', 't', 'z', 's', 'c', 'h', 'l', 'e', 'r'};
int pos = 0;
int posretry = 0;
bool ledon = false;



void setup()
{
  pinMode(13, OUTPUT);

  lcd.init();
  lcd.backlight(); //lcd.noBacklight();
}

void scroll()
{
  for (int i = 0; i < 12; i++)
  {
    //Print text
    lcd.setCursor(i + pos, 0);
    lcd.print(Str[i]);

    //Move in text from the left

    if (pos >= 6)
    {
      lcd.setCursor(i + pos, 0);
      lcd.print(Str[i]);

      lcd.setCursor(posretry, 0);
      lcd.print(Str[11 - posretry]);

      posretry++;
    }
  }
  delay(500);
  lcd.clear();

  pos++;
}

void changeled()
{
  if (ledon == false)
  {
    digitalWrite(13, LOW);
  }
  else
  {
    digitalWrite(13, HIGH);
  }

  ledon = !ledon;
}

void loop()
{
  scroll();
  changeled();  //Example Event
}

The goal is to move the text to the right and show the not displayed letters on the left.

Example:

|er    Truetzschl|  -->
|                |

A Video about the error can be found here: https://data.jonas-heinze.de/shares/stackexchange/lcd/

Thanks for your help.