Arduino to p5/Neopixel

Arduino code

// Adafruit_NeoMatrix example for single NeoPixel Shield.
// Scrolls 'Howdy' across the matrix in a portrait (vertical) orientation.

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
#define PSTR // Make Arduino Due happy
#endif
String readString; // creates the string scrolling text will be held in

#define PIN 6

// MATRIX DECLARATION:
// Parameter 1 = width of NeoPixel matrix
// Parameter 2 = height of matrix
// Parameter 3 = pin number (most are valid)
// Parameter 4 = matrix layout flags, add together as needed:
//   NEO_MATRIX_TOP, NEO_MATRIX_BOTTOM, NEO_MATRIX_LEFT, NEO_MATRIX_RIGHT:
//     Position of the FIRST LED in the matrix; pick two, e.g.
//     NEO_MATRIX_TOP + NEO_MATRIX_LEFT for the top-left corner.
//   NEO_MATRIX_ROWS, NEO_MATRIX_COLUMNS: LEDs are arranged in horizontal
//     rows or in vertical columns, respectively; pick one or the other.
//   NEO_MATRIX_PROGRESSIVE, NEO_MATRIX_ZIGZAG: all rows/columns proceed
//     in the same order, or alternate lines reverse direction; pick one.
//   See example below for these values in action.
// Parameter 5 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)


// Example for NeoPixel Shield.  In this application we'd like to use it
// as a 5x8 tall matrix, with the USB port positioned at the top of the
// Arduino.  When held that way, the first pixel is at the top right, and
// lines are arranged in columns, progressive order.  The shield uses
// 800 KHz (v2) pixels that expect GRB color data.
Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(8, 8, PIN,
                            NEO_MATRIX_TOP     + NEO_MATRIX_LEFT +
                            NEO_MATRIX_ROWS + NEO_MATRIX_PROGRESSIVE,
                            NEO_GRB            + NEO_KHZ800);

const uint16_t colors[] = {
  matrix.Color(255, 0, 0), matrix.Color(0, 255, 0), matrix.Color(0, 0, 255)
};

#define INLENGTH 16
#define INTERMINATOR 13
const int potInput = A0;
const char* city;
const char* oldCity;
int fill = matrix.Color(0,0,0);

void setup() {
  Serial.begin(9600);
  while (Serial.available() <= 0) {
    Serial.println("hello"); // send a starting message
    delay(300);              // wait 1/3 second
  }
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(40);
  matrix.show();
  
  matrix.setTextColor(matrix.Color(255, 0, 0));
  Serial.setTimeout(10);
}

int x = matrix.width(); //holds the width of the matrix for counting colums
int pass = 0; //used to calculate the number of characters read from the serial input




void loop () {
  matrix.setCursor(x, 0); //set the begining cursor position
  matrix.fillScreen(fill);
  //City Selector
  //Potentiometer split into 5 different ranges of potValues
  // for 5 different cities:
  // 1) 0-204 = New York, USA,
  // 2) 205-408 = Rio de Janeiro, Brasil,
  // 3) 409-612 = Santiago, Chile,
  // 4) 613-816 = Washington DC, USA,
  // 5) 817-1023 = Rome, Italy,

  int potValue = analogRead(potInput);
  if (city  != oldCity) {
    Serial.println(city);
    oldCity = city;
  }

  if (potValue <= 1023/25) {
    city = "New York";
    fill = matrix.Color(255,255,0);
    matrix.setTextColor(matrix.Color(127.5, 127.5, 127.5));
    matrix.show();
  }
  else if (potValue > 1023/25 && potValue <= ((1023/25)*2)) {
    city = "Rio de Janeiro";
    fill = matrix.Color(0, 255 , 0);
    matrix.setTextColor(matrix.Color(255, 255, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*2) && potValue <= ((1023/25)*3)) {
    city = "Santiago";
    fill = matrix.Color(0, 0, 255);
    matrix.setTextColor(matrix.Color(255, 0, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*3) && potValue <= ((1023/25)*4)) {
    city = "Washington DC";
    fill = matrix.Color(255, 0 , 0);
    matrix.setTextColor(matrix.Color(255, 255, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*4) && potValue <= ((1023/25)*5)) {
    city = "Rome";
    fill = matrix.Color(0, 255 , 0);
    matrix.setTextColor(matrix.Color(255, 0, 0));
    matrix.show();
  }
    else if (potValue > ((1023/25)*5) && potValue <= ((1023/25)*6)) {
    city = "Cairo";
    fill = matrix.Color(255, 255 , 0);
    matrix.setTextColor(matrix.Color(255, 110, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*6) && potValue <= ((1023/25)*7)) {
    city = "Tokyo";
    fill = matrix.Color(255, 255 , 255);
    matrix.setTextColor(matrix.Color(255, 0, 0));
    matrix.show();
  }

  else if (potValue > ((1023/25)*7) && potValue <= ((1023/25)*8)) {
    city = "Cape Town";
    fill = matrix.Color(255, 0 , 0);
    matrix.setTextColor(matrix.Color(0, 255, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*8) && potValue <= ((1023/25)*9)) {
    city = "London";
    fill = matrix.Color(255, 100 , 255);
    matrix.setTextColor(matrix.Color(0, 255, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*9) && potValue <= ((1023/25)*10)) {
    city = "Mexico City";
    fill = matrix.Color(255, 0 , 0);
    matrix.setTextColor(matrix.Color(0, 255, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*10) && potValue <= ((1023/25)*11)) {
    city = "Delhi";
    fill = matrix.Color(0, 255 , 0);
    matrix.setTextColor(matrix.Color(255, 140, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*11) && potValue <= ((1023/25)*12)) {
    city = "Moscow";
    fill = matrix.Color(255, 0 , 175);
    matrix.setTextColor(matrix.Color(0, 0, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*12) && potValue <= ((1023/25)*12)) {
    city = "Lagos";
    fill = matrix.Color(0, 255 , 0);
    matrix.setTextColor(matrix.Color(255, 255, 255));
    matrix.show();
  }
   else if (potValue > ((1023/25)*13) && potValue <= ((1023/25)*14)) {
    city = "Seoul";
    fill = matrix.Color(255, 0 , 0);
    matrix.setTextColor(matrix.Color(0, 0, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*14) && potValue <= ((1023/25)*15)) {
    city = "Beijing";
    fill = matrix.Color(255, 0 , 0);
    matrix.setTextColor(matrix.Color(255, 255, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*15) && potValue <= ((1023/25)*16)) {
    city = "Paris";
    fill = matrix.Color(255, 255 , 255);
    matrix.setTextColor(matrix.Color(0, 0, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*16) && potValue <= ((1023/25)*17)) {
    city = "Buenos Aires";
    fill = matrix.Color(0, 255 , 255);
    matrix.setTextColor(matrix.Color(255, 255, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*17) && potValue <= ((1023/25)*18)) {
    city = "Tegucigalpa";
    fill = matrix.Color(0, 0 , 255);
    matrix.setTextColor(matrix.Color(255, 255, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*18) && potValue <= ((1023/25)*19)) {
    city = "Kigali";
    fill = matrix.Color(255, 255 , 0);
    matrix.setTextColor(matrix.Color(0, 200, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*19) && potValue <= ((1023/25)*20)) {
    city = "Caracas";
    fill = matrix.Color(100, 0 , 60);
    matrix.setTextColor(matrix.Color(255, 255, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*20) && potValue <= ((1023/25)*21)) {
    city = "Barcelona";
    fill = matrix.Color(0, 0 , 200);
    matrix.setTextColor(matrix.Color(150, 0, 70));
    matrix.show();
  }
  else if (potValue > ((1023/25)*21) && potValue <= ((1023/25)*22)) {
    city = "Astana";
    fill = matrix.Color(0, 255 , 255);
    matrix.setTextColor(matrix.Color(255, 255, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*22) && potValue <= ((1023/25)*23)) {
    city = "Amsterdam";
    fill = matrix.Color(255, 140 , 0);
    matrix.setTextColor(matrix.Color(255, 255, 255));
    matrix.show();
  }
  else if (potValue > ((1023/25)*23) && potValue <= ((1023/25)*24)) {
    city = "Berlin";
    fill = matrix.Color(140, 0 , 0);
    matrix.setTextColor(matrix.Color(255, 140, 0));
    matrix.show();
  }
  else if (potValue > ((1023/25)*24) && potValue <= 1023) {
    city = "Los Angeles";
    fill = matrix.Color(255, 255 , 0);
    matrix.setTextColor(matrix.Color(150, 0, 215));
    matrix.show();
  }
  


delay(1);
  serialtochar();
  chartoscreen();
} //end loop


void serialtochar()
{
//  while (Serial.available()) //if serial data is available, run the loop
  {
    while (Serial.available() > 0) //if there is serial data continue
    {
      char c = Serial.read(); //read the next byte of data
      readString += c; //append the data to the char variable readString
    }
  }
}


void chartoscreen()
{
//    matrix.fillScreen(matrix.Color(0, 0 , 255));
  if (readString.length() > 0) //if the number of bytes in readString are greater than 0
  {
    matrix.println(readString  ); //print the data in readString
    //Serial.println(city);
    pass = -abs(readString.length()); //set pass to the negative value of the number of characters
    if (--x < pass * 6) //reserve 6 spaces for each character - continue looping until x = pass * 6
    {
      x = matrix.width(); //set x to the number of colums in the matrix
      readString = ""; //set the data to blank
      //if(++pass >= 3) pass = 0;
      //    matrix.setTextColor(colors[pass]);
    }
    matrix.show(); //show the data stored
    delay(75); //wait a bit - sets scrolling speed
  }
}