 #define TUNING 9 // Tunes range-finding to cm distance between pixels
 #define FPS 50
 #define NUM_PIXELS 50
-#define TRAIL_LENGTH 10
+#define TRAIL_LENGTH 4
 
 Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_PIXELS, PIN, NEO_GRB + NEO_KHZ800);
 

        colors[i] = strip.Color(255, 255, 0);
        break;
      case 4:
        colors[i] = strip.Color(255, 0, 255);
        break;
    }
  }

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  #if defined(__AVR_ATtiny85__)
    if (F_CPU == 16000000)
      clock_prescale_set(clock_div_1);
  #endif

  initColors();

