LEDTape2.ino

#include <Adafruit_NeoPixel.h>
#define PIN 2
#define NUMPIXELS 300
#define DELAY 10
int frameCount = 0;

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  pixels.begin();
}

void loop() {
  pixels.clear();
  for(int i=0; i<NUMPIXELS/2; i++){
    if(0 < (i+frameCount)/4. && (i+frameCount)/4. < PI){
      pixels.setPixelColor(i, pixels.ColorHSV(((i+frameCount)*500), 255, sin((i+frameCount)/4.)*5));//~65536?, ~256, ~256
      pixels.setPixelColor(NUMPIXELS-i, pixels.ColorHSV(((i+frameCount)*500), 255, sin((i+frameCount)/4.)*5));//~65536?, ~256, ~256
    }
  }
  if(frameCount > 0){
    frameCount = -NUMPIXELS;
  }
  //pixels.setPixelColor(frameCount%NUMPIXELS, pixels.ColorHSV(((frameCount)*500), 255, 5));//~65536?, ~256, ~256
  //pixels.setPixelColor((NUMPIXELS-frameCount)%NUMPIXELS, pixels.ColorHSV(((frameCount)*500), 255, 5));//~65536?, ~256, ~256
  pixels.show();
  delay(DELAY);
  frameCount++;
}