Programmable Stranger Things Light Wall Costume

/* Prototype for haloween costume 2016, read input string from serial and perfrom action character by character with delay */
// Built from StringLength Arduino example and Adafruit StrandTest example

#include "Adafruit_WS2801.h"
#include "SPI.h" // Comment out this line if using Trinket or Gemma

#define ONDELAY 750
#define OFFDELAY 500

String txtMsg = "welcome";    // Initialize default string for incoming text
uint8_t dataPin  = 3;    // Yellow wire on Adafruit Pixels
uint8_t clockPin = 2;    // Green wire on Adafruit Pixels
Adafruit_WS2801 strip = Adafruit_WS2801(25, dataPin, clockPin);

// Array to handle colors of alphabet, 3 element subarrays represent rgb
const int colors[26][3] {
  {255, 100, 0}, // a
  {0, 100, 255}, // b
  {255, 0, 100}, // c
  {100, 255, 0}, // d
  {0, 100, 255}, // e
  {255, 100, 0}, // f
  {255, 0, 100}, // g
  {100, 255, 0}, // h
  {0, 100, 255}, // i
  {255, 0, 100}, // j
  {0, 100, 255}, // k
  {100, 255, 0}, // l
  {255, 100, 0}, // m
  {255, 0, 100}, // n
  {255, 0, 100}, // o
  {100, 255, 0}, // p
  {255, 0, 100}, // q
  {100, 255, 0}, // r
  {255, 100, 0}, // s
  {255, 100, 0}, // t
  {0, 100, 255}, // u
  {255, 0, 100}, // v
  {0, 100, 255}, // w
  {255, 100, 0}, // x
  {255, 0, 100}, // y
  {255, 0, 100}, // z
};

// Array to transpose incoming ascii positions to corresponding positions in light fixture
const int charPos[25] {
  19, //A
  20, //B
  21, //C
  22, //D
  23, //E
  24, //F
  18, //G
  17, //H
  16, //I
  15, //J
  14, //K
  13, //L
  12, //M
  5, //N
  6, //O
  7, //P
  8, //Q
  9, //R
  10, //S
  11, //T
  4, //U
  3, //V
  2, //W
  1, //X
  0, //Y
};

void setup() {
  
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  strip.begin();

  // Update LED contents, to start they are all 'off'
  strip.show(); // write all pixels out
}

// Create a 24 bit color value from R,G,B
uint32_t Color(byte r, byte g, byte b) {
  uint32_t c;
  c = r;
  c <<= 8;
  c |= g;
  c <<= 8;
  c |= b;
  return c;
}

// Program to step through string character by character and perform an action 
void printChar(String input) {

  for (int i = 0; i < input.length(); i++) {
    int pos = (((int)input[i]) - 97);
    // Get color from colors array 
    // Subtract one from pos to properly index charPos Array
    strip.setPixelColor(charPos[pos], Color(colors[pos][0], colors[pos][1], colors[pos][2]));
    strip.show();
    delay(ONDELAY);
    strip.setPixelColor(charPos[pos], Color(0, 0, 0));
    strip.show();
    delay(OFFDELAY);
  }
}

// Function to blink all lights at constant speed
void blinkConst(void) {
  
  int blinkCount = 0;
  int i;
  
  while (blinkCount < 3) {
    for (i = 0; i < strip.numPixels(); i++) {
      strip.setPixelColor(i, Color(colors[i][0], colors[i][1], colors[i][2]));
    }
    strip.show();
    delay(ONDELAY);
    for (i = 0; i < strip.numPixels(); i++) {
      strip.setPixelColor(i, Color(0, 0, 0));
    }
    strip.show();
    delay(OFFDELAY);
    blinkCount++;
  }
}

// Function to blink all lights at variable speed
void blinkVar(int speed) {

  int i;
  
  for (i = 0; i < strip.numPixels(); i++) {
     strip.setPixelColor(i, Color(colors[i][0], colors[i][1], colors[i][2]));
  }
  strip.show();
  delay(speed);
  for (i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(i, Color(0, 0, 0));
  }
  strip.show();
  delay(speed);
}

// Function to blink all lights randomly
void blinkRandom(int speed) {

  int i, randomNum;

  for (i = 0; i <= 50; i++) {
    randomNum = random(strip.numPixels());
    strip.setPixelColor(randomNum, Color(colors[i][0], colors[i][1], colors[i][2]));
    strip.show();
    delay(speed);
    strip.setPixelColor(randomNum, Color(0, 0, 0));
    strip.show();
    delay(speed);
  }
}

// Function to blink all lights in a row
void blinkRow(int speed) {

  int i;
  
  for (i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(charPos[i], Color(colors[i][0], colors[i][1], colors[i][2]));
    strip.show();
    delay(speed);
  }
  for (i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(i, Color(0, 0, 0));
  }
  strip.show();
}

// Main program body, loop checks for new serial input and runs functions based on character input or default print function
void loop() {
  
  // Set string to incoming text
  while (Serial.available() > 0) {
    delay(10);
    char inChar = Serial.read();
    if(inChar == '*'){  // Clear string using '*' input
      txtMsg = "";
    } 
    else if (inChar == '%'){  // Run other functions using specified inputs
      blinkConst();
    }
    else if (inChar == '&'){  // Run other functions using specified inputs
      for (int i = 500; i >= 50; i -= 50)
      {
        blinkVar(i);
      }
    }
    else if (inChar == '$'){  // Run other functions using specified inputs
      blinkRandom(50);
    }
    else if (inChar == '#'){  // Run other functions using specified inputs
      blinkRow(50);
    }
    else {  // Other wise add input serial character to cleared string
    txtMsg += inChar;
    }
  }

  //blinkBlink();
  printChar(txtMsg);
}