Add fast led demo

fastled/FastLED_RGBW.h

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+/* 
+ * Hack to enable SK6812 RGBW strips to work with FastLED.
+ *
+ * Original code by Jim Bumgardner (http://krazydad.com).
+ * Modified by David Madison (http://partsnotincluded.com).
+ * 
+*/
+ 
+#ifndef FastLED_RGBW_h
+#define FastLED_RGBW_h
+ 
+struct CRGBW  {
+  union {
+    struct {
+      union {
+        uint8_t g;
+        uint8_t green;
+      };
+      union {
+        uint8_t r;
+        uint8_t red;
+      };
+      union {
+        uint8_t b;
+        uint8_t blue;
+      };
+      union {
+        uint8_t w;
+        uint8_t white;
+      };
+    };
+    uint8_t raw[4];
+  };
+ 
+  CRGBW(){}
+ 
+  CRGBW(uint8_t rd, uint8_t grn, uint8_t blu, uint8_t wht){
+    r = rd;
+    g = grn;
+    b = blu;
+    w = wht;
+  }
+ 
+  inline void operator = (const CRGB c) __attribute__((always_inline)){ 
+    this->r = c.r;
+    this->g = c.g;
+    this->b = c.b;
+    this->white = 0;
+  }
+};
+ 
+inline uint16_t getRGBWsize(uint16_t nleds){
+  uint16_t nbytes = nleds * 4;
+  if(nbytes % 3 > 0) return nbytes / 3 + 1;
+  else return nbytes / 3;
+}
+ 
+#endif

fastled/fastled.ino

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+/*
+ * Example sketch using FastLED for RGBW strips (SK6812). Includes
+ * color wipes and rainbow pattern.
+ *
+ * Written by David Madison
+ * http://partsnotincluded.com
+*/
+
+#include "FastLED.h"
+#include "FastLED_RGBW.h"
+
+#define NUM_LEDS 60
+#define DATA_PIN 6
+
+CRGBW leds[NUM_LEDS];
+CRGB *ledsRGB = (CRGB *) &leds[0];
+
+const uint8_t brightness = 128;
+
+void setup() { 
+  FastLED.addLeds<WS2812B, DATA_PIN, RGB>(ledsRGB, getRGBWsize(NUM_LEDS));
+  FastLED.setBrightness(brightness);
+  FastLED.show();
+}
+
+void loop(){
+  colorFill(CRGB::Red);
+  colorFill(CRGB::Green);
+  colorFill(CRGB::Blue);
+  fillWhite();
+  rainbowLoop();
+}
+
+void colorFill(CRGB c){
+  for(int i = 0; i < NUM_LEDS; i++){
+    leds[i] = c;
+    FastLED.show();
+    delay(50);
+  }
+  delay(500);
+}
+
+void fillWhite(){
+  for(int i = 0; i < NUM_LEDS; i++){
+    leds[i] = CRGBW(0, 0, 0, 255);
+    FastLED.show();
+    delay(50);
+  }
+  delay(500);
+}
+
+void rainbow(){
+  static uint8_t hue;
+
+  for(int i = 0; i < NUM_LEDS; i++){
+    leds[i] = CHSV((i * 256 / NUM_LEDS) + hue, 255, 255);
+  }
+  FastLED.show();
+  hue++;
+}
+
+void rainbowLoop(){
+  long millisIn = millis();
+  long loopTime = 5000; // 5 seconds
+
+  while(millis() < millisIn + loopTime){
+    rainbow();
+    delay(5);
+  }
+}