Arduino + Stranger Things

gistfile1.txt

#include <Adafruit_NeoPixel.h>

#define PIN 6

// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = 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)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(50, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(9600);
  // put your setup code here, to run once:
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {
  // Some example procedures showing how to display to the pixels:
  delay(200);
  spellMessage("happy birthday lily and natalie", false);
  delay(200);
  glowFlash();
  delay(200);
  spellMessage("run", true);
  delay(200);
  glowFlash();
}

void spellMessage(String message, bool stayLit) {
  for(int i=0; i<message.length(); i++) {
    char letter = message[i];
    if (letter == ' ') {
      delay(500);
      continue;
    }
    int lightIndex = indexForChar(letter);
    strip.setPixelColor(lightIndex, strip.Color(255,255,255));
    strip.show();
    delay(500);
    strip.setPixelColor(lightIndex, strip.Color(0,0,0));
    strip.show();
    delay(1000);
  }

  if (stayLit) {
    for(int i=0; i<message.length(); i++) {
      char letter = message[i];
      int lightIndex = indexForChar(letter);
      strip.setPixelColor(lightIndex, strip.Color(255,255,255));
    }
    strip.show();
    delay(1000);
    colorWipe(strip.Color(0,0,0), 0);
    delay(200);
  }
}
void glow(int startAlpha, int endAlpha, int duration) {
  colorWipe(strip.Color(startAlpha,startAlpha,startAlpha), 0);
  int difference = endAlpha - startAlpha;
  int delayT = duration / difference;
  for(int i=0; i < delayT; i++) {
    int newAlpha = (i * delayT) + startAlpha;
    colorWipe(strip.Color(newAlpha,newAlpha,newAlpha), 0);
    delay(delayT);
  }
}
void glowFlash() {
  int alphaGradient[] = {0, 10, 50, 25, 125, 255, 120, 60, 15, 0};
  colorWipe(strip.Color(0,0,0), 0);
  for (int i=0; i < sizeof(alphaGradient); i++) {
    int alpha = alphaGradient[i];
    colorWipe(strip.Color(alpha,alpha,alpha), 0);
    delay(100);
  }
  colorWipe(strip.Color(0,0,0), 0);
}
void colorWipe(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
      strip.setPixelColor(i, c);
      delay(wait);
  }
  strip.show();
}

int indexForChar(char c) {
  switch (c) {
    case 'a':
    return 0;
    case 'b':
    return 1;
    case 'c':
    return 2;
    case 'd':
    return 3;
    case 'e':
    return 4;
    case 'f':
    return 5;
    case 'g':
    return 6;
    case 'h':
    return 7;
    case 'i':
    return 16;
    case 'j':
    return 15;
    case 'k':
    return 14;
    case 'l':
    return 13;
    case 'm':
    return 12;
    case 'n':
    return 11;
    case 'o':
    return 10;
    case 'p':
    return 9;
    case 'q':
    return 8;
    case 'r':
    return 17;
    case 's':
    return 18;
    case 't':
    return 19;
    case 'u':
    return 20;
    case 'v':
    return 21;
    case 'w':
    return 22;
    case 'x':
    return 23;
    case 'y':
    return 24;
    case 'z':
    return 25;
  }
}