#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>

#define PIN 6
#define LED_COUNT 256

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 40, 6,
  NEO_MATRIX_TOP     + NEO_MATRIX_LEFT +
  NEO_MATRIX_ROWS + NEO_MATRIX_PROGRESSIVE,
  NEO_GRBW            + NEO_KHZ800);

const uint16_t colors[] = {
  matrix.Color(255, 0, 50), 
  matrix.Color(122, 255, 0), 
  matrix.Color(0, 255, 255) };
  
void setup() {
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(40);
  matrix.setTextColor(colors[0]);
}

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

void loop() {
  matrix.fillScreen(0);
  matrix.setCursor(x, 0);
  matrix.print(F("Howdy"));
  x = x - 1; 
  if(x < -36) {
    x = matrix.width();
    pass = pass + 1;
    if(pass >= 3) pass = 0;
    matrix.setTextColor(colors[pass]);
  }
  matrix.show();
  delay(100);
}