infinite_150924.ino

#include <FastLED.h>
#define LED_PIN 13
#define LED_BUILTIN 2

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 180  // Popular NeoPixel ring size
#define DELAYVAL 10  // Time (in milliseconds) to pause between frames

CRGB leds[NUMPIXELS];
int iter_id = 0;

void setup(void) {
  Serial.begin(115200);
  while (!Serial)
    delay(10);  // will pause Zero, Leonardo, etc until serial console opens

  delay(100);
  pinMode(LED_BUILTIN, OUTPUT);
  FastLED.addLeds<NEOPIXEL, LED_PIN>(leds, NUMPIXELS);
}

void fill_rainbow( struct CRGB * pFirstLED, int numToFill,
                  float initialhue,
                  float deltahue, uint8_t val, uint8_t sat)
{
    float hueshift = 0.00f;
    CHSV hsv;
    hsv.hue = initialhue;
    hsv.val = val;
    hsv.sat = sat;
    for( int i = 0; i < numToFill; ++i) {
        pFirstLED[i] = hsv;
        hueshift += deltahue;
        hsv.hue = initialhue + hueshift;
    }
}

// led modes

void rainbow() {
  auto maxhueshift = 10;
  float initial = 240+27;
  auto deltahue = 0.02;
  auto value = 60;
  auto saturation = 240;
  static float i = 1;
  static float direction = 0.0; //0.005;
  // static float direction = 0.005;
  i += direction;
  // float jitter = random(0,255)/255.0 * 0.1;
  auto jitter = 0;
  if (i > maxhueshift) {direction = -direction;}
  if (i < 1) {direction = -direction;}
  fill_rainbow(leds, NUMPIXELS, initial + (i + jitter), deltahue, value, saturation);
  // CHSV hsv{ hue, 255, 255 };
  // CRGB rgb;
  // hsv2rgb_rainbow(hsv, rgb);
  // FastLED.showColor(rgb);
  FastLED.show();
}


void loop() {
  iter_id++;
  // digitalWrite(LED_BUILTIN, iter_id % 2);
  digitalWrite(LED_BUILTIN, HIGH);
  rainbow();
  delay(DELAYVAL);
}