add

libraries/FastLED-3.2.9/examples/RGBSetDemo/RGBSetDemo.ino

@@ -0,0 +1,22 @@
+#include <FastLED.h>
+#define NUM_LEDS 40
+
+CRGBArray<NUM_LEDS> leds;
+
+void setup() { FastLED.addLeds<NEOPIXEL,6>(leds, NUM_LEDS); }
+
+void loop(){ 
+  static uint8_t hue;
+  for(int i = 0; i < NUM_LEDS/2; i++) {   
+    // fade everything out
+    leds.fadeToBlackBy(40);
+
+    // let's set an led value
+    leds[i] = CHSV(hue++,255,255);
+
+    // now, let's first 20 leds to the top 20 leds, 
+    leds(NUM_LEDS/2,NUM_LEDS-1) = leds(NUM_LEDS/2 - 1 ,0);
+    FastLED.delay(33);
+  }
+}
+