LED Matrix, scrolling text with serial monitor

Projects General Guidance
1

Hello,

after around 4 months I have to ask around for a Little help.
I have build a LED Matrix with 8x39 LED`s. The Goal is to send a Scrolling text from the Serial Monitor to the Arduino. The Text should run on the Matrix until a new Text is typed in the Serial Monitor.

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
 #define PSTR 
#endif

#define PIN 6  // Ausgangspin

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(39, 8, PIN,
  NEO_MATRIX_TOP     + NEO_MATRIX_LEFT +
  NEO_MATRIX_ROWS + NEO_MATRIX_ZIGZAG,
  NEO_GRB            + NEO_KHZ800);

const uint16_t colors[] = {
  matrix.Color(100, 100, 100), matrix.Color(0, 100, 0), matrix.Color(0, 0, 100) };  //Farbkombinationsdurchläufe

void setup() {
  matrix.begin();
  matrix.setTextWrap(false);  //buchstaben laufen von hinten flüssig ins bild; bei true springt jeder Buchstabe einzeln rein
  matrix.setBrightness(40);  // Gesamthelligkeit
  matrix.setTextColor(colors[0]);
  Serial.begin(9600);
}

int x    = matrix.width();
int pass = 0;

void loop() {
  matrix.fillScreen(0);
  matrix.setCursor(x, 0);
  {
   if (Serial.available()) {       // charakter erreichen serial port
     delay(100);                   // warten, bis text ankommt
     while (Serial.available() > 0) {         // lese vorhandene charakter
       matrix.write(Serial.read());             // charakter auf display
         if(--x < -30) {            //Gesamtweite des möglichen Textes
    x = matrix.width();
    if(++pass >= 3) pass = 0;  //Anzahl der Farbdurchläufe
      matrix.setTextColor(colors[pass]);
  }
     }
       matrix.show();
  delay(100);  //Geschwindigkeit des Text-Durchlaufes
   }
   }
   }

So the Text jumps with every send Message one Bit to the left on my Matrix.
Example I type an "A" send it and repeat this often the "A" slowly goes from right to left.
But it should be automatically Scrolling. I hope you guys can see my Problem?

Peace

matrix.jpg
matrix.jpg1959×1170 817 KB

2

You need to get into the habit of using Auto Format (under Tools) to make the code progress legible.

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
#define PSTR 
#endif

#define PIN 6  // Ausgangspin

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(39, 8, PIN,
NEO_MATRIX_TOP     + NEO_MATRIX_LEFT +
NEO_MATRIX_ROWS + NEO_MATRIX_ZIGZAG,
NEO_GRB            + NEO_KHZ800);

const uint16_t colors[] = {
  matrix.Color(100, 100, 100), matrix.Color(0, 100, 0), matrix.Color(0, 0, 100) };  //Farbkombinationsdurchläufe

void setup() {
  matrix.begin();
  matrix.setTextWrap(false);  //buchstaben laufen von hinten flüssig ins bild; bei true springt jeder Buchstabe einzeln rein
  matrix.setBrightness(40);  // Gesamthelligkeit
  matrix.setTextColor(colors[0]);
  Serial.begin(9600);
}

int x    = matrix.width();
int pass = 0;

void loop() {
  matrix.fillScreen(0);
  matrix.setCursor(x, 0);
  {
    if (Serial.available()) {       // charakter erreichen serial port
      delay(100);                   // warten, bis text ankommt
      while (Serial.available() > 0) {         // lese vorhandene charakter
        matrix.write(Serial.read());             // charakter auf display
        if(--x < -30) {            //Gesamtweite des möglichen Textes
          x = matrix.width();
          if(++pass >= 3) pass = 0;  //Anzahl der Farbdurchläufe
          matrix.setTextColor(colors[pass]);
        }
      }
      matrix.show();
      delay(100);  //Geschwindigkeit des Text-Durchlaufes
    }
  }
}

Given that only matrix.fillScreen(0); and matrix.setCursor(x, 0); are executed when there is no input from the serial monitor, which of those do you expect to perform scrolling?

{Caveat: I have no idea whatsoever about these libraries!}