===== Arduino-WS (6) =====

FastLED-Library
<code>
1. http://fastled.io/
     Klick auf "Releases" im Menü
       herunterscrollen zu "Downloads"
         Source code (zip)
         Source code (tar.gz)
2. auspacken, ins arduino_sketch-Unter-Verzeichnis "libraries"
3. Verzeichnis umbenennnen in "FastLED"
4. Ggf. Arduino neustarten
</code>

C-Kenntnisse - Struct
<code>
typedef struct
{ uint8_t r;
  uint8_t g;
  uint8_t b;
} my_RGB;

my_RGB px;
px.r=255;

my_RGB pxs[3];
pxs[0].r=255;

</code>

Das erste Programm mit WS2812b LED-Streifen
<code>
#include <FastLED.h>

const int LEDPin = 4;
const int NPixels = 9;
CRGB leds[NPixels];

int pos=0;

void setup()
{ FastLED.addLeds<NEOPIXEL, LEDPin>(leds, NPixels);
}

void loop()
{ 
  for (int i=0; i<NPixels; i++)
  { leds[i].setRGB(0,0,0);
  }
  //leds[pos].setRGB(32,16,0);
  leds[pos].r=32;
  leds[pos].g=16;
  
  FastLED.show();
  pos++;
  if (pos >= NPixels) pos=0;
  delay(200);
}

/*
Ungefähr (aus FastLEDpixeltypes.h)

struct CRGB
{ union
  { struct
    { union
      { uint8_t r;
        uint8_t red;
      };
      union
      { uint8_t g;
        uint8_t green;
      };
      union
      { uint8_t b;
        uint8_t blue;
      };
    };
    uint8_t raw[3];
  };
  ...
};
struct CRGB
{ uint8_t r;
  uint8_t g;
  uint8_t b;
};
*/
</code>


Experimental..temporär:
<code>
#include <FastLED.h>


const int LEDPin = 4;
const int NPixels = 18;
CRGB leds[NPixels];


typedef struct
{ uint8_t r,g,b;
  int     pos;
} PUNKT;

const int NPunkte = 6;

PUNKT punkte[NPunkte];


int pos=0;

void setup()
{
  FastLED.addLeds<NEOPIXEL, LEDPin>(leds, NPixels+2); // +2 zur Sicherheit für Effekte
  
  for (int j=0; j<NPunkte; j++)
    punkte[j]={random(256),random(256),random(256), random(NPixels)};
}

void loop()
{ 
  for (int i=0; i<NPixels; i++)
  { 
    leds[i].setRGB(0,0,0);
  }
  
  for (int j=0; j<NPunkte; j++)
  { 
    leds[ punkte[j].pos ].setRGB(punkte[j].r, punkte[j].g, punkte[j].b);
  }
  
  /* typedef struct
  { uint8_t r,g,b;
    int     pos;
  } PUNKT; */

  
  /*
  //leds[pos].setRGB(32,16,0);
  //leds[pos].r=32;
  //leds[pos].g=16;
  
  for (int i=0; i<NPixels; i++)
  { leds[(i+pos)%NPixels].r= i* (int)255 /(NPixels-1);
    leds[(i+pos)%NPixels].g= (NPixels-i-1)* (int)255 /(NPixels-1);
    
  }*/
  
  FastLED.show();
  
  // Alternative zu untenstehendem: pos = (pos+1)%NPixels;
  pos++;
  if (pos >= NPixels-1) pos=0;
  
  delay(200);
}

/*
Ungefähr (aus FastLEDpixeltypes.h)

struct CRGB
{ union
  { struct
    { union
      { uint8_t r;
        uint8_t red;
      };
      union
      { uint8_t g;
        uint8_t green;
      };
      union
      { uint8_t b;
        uint8_t blue;
      };
    };
    uint8_t raw[3];
  };
  ...
};
struct CRGB
{ uint8_t r;
  uint8_t g;
  uint8_t b;
};
a[1] = {60,0,0};
*/
}
</code>
{{tag> Frickl}}