   pinMode(TRIG_PIN, OUTPUT);
   pinMode(ECHO_PIN, INPUT);
 
-#if defined(__AVR_ATtiny85__)
-  if (F_CPU == 16000000)
-    clock_prescale_set(clock_div_1);
-#endif
+  #if defined(__AVR_ATtiny85__)
+    if (F_CPU == 16000000)
+      clock_prescale_set(clock_div_1);
+  #endif
 
   initColors();
 

void colorWipe(uint8_t pixel) {
   std::rotate(trailingPixels, trailingPixels + TRAIL_LENGTH - 1, trailingPixels + TRAIL_LENGTH);
   trailingPixels[0] = pixel;
   
  for (uint8_t i = 0; i < strip.numPixels(); i++) {
    int *leaveLit = std::find(std::begin(trailingPixels), std::end(trailingPixels), pixel);
    
//    if (leaveLit == std::end(trailingPixels)) {
    strip.setPixelColor(i, 0);
//    }
  }
}

void initColors() {
  for (int i = 0; i < strip.numPixels(); i++) {
    int rgb = random(5);
    switch (rgb) {
      case 0:
        colors[i] = strip.Color(255, 0, 0);

#define TUNING 9 // Tunes range-finding to cm distance between pixels
#define FPS 50
#define NUM_PIXELS 50
#define TRAIL_LENGTH 4

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_PIXELS, PIN, NEO_GRB + NEO_KHZ800);

