red.c

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif

#define PIN 8
#define NUM_LEDS 240
#define BRIGHTNESS 100
#define PI 3.1415926535897932384626433832795

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

byte sines[NUM_LEDS];

void setup() {
  strip.setBrightness(BRIGHTNESS);
  strip.begin();
  strip.show();

  for (uint16_t i = 0; i < strip.numPixels(); i++) {
    byte val = (byte) (((sin(((float) i / NUM_LEDS * 4) * 2 * PI) + 1) / 2) * 255);
    sines[i] = (val < 3) ? 3 : val;
  }
}

void loop() {
  for (uint16_t i = 0; i < strip.numPixels(); i++) {
    for (uint16_t j = 0; j < strip.numPixels(); j++) {
      strip.setPixelColor(j, strip.Color(sines[(j + i) % 240], 0, 0, 255) );
    }
    delay(40);
    strip.show();
  }
}