NeoPixel enhancements

This starts with Adafruit's NeoPixel library and reworks it a little to
enhance support for animations.

examples/NeeoPixel16Ring/NeoPixel16RingFun.pde

@@ -0,0 +1,123 @@
+#include <NeoPixelBus.h>
+
+NeoPixelBus strip = NeoPixelBus(16, 8);
+uint16_t p = 0;
+
+
+
+void setup()
+{
+  strip.Begin();
+  strip.Show();
+  randomSeed(analogRead(0));
+  Serial.begin(9600);
+
+}
+
+
+void loop()
+{
+  Serial.println("next");
+  
+
+  
+  // LoopAround(192, 200);
+  PickRandom(128);
+  // FadeInFadeOutRinseRepeat(192);
+  
+  // start animating
+  strip.StartAnimating();
+  
+  // wait until no more animations are running
+  while (strip.IsAnimating())
+  {
+    strip.UpdateAnimations();
+    strip.Show();
+    delay(31); // ~30hz change cycle
+  }
+ 
+}
+
+void FadeInFadeOutRinseRepeat(uint8_t peak)
+{
+  if (p == 0)
+  {
+    for (uint8_t pixel = 0; pixel < 16; pixel++)
+    {
+      uint16_t time = random(800,1000);
+      strip.LinearFadePixelColor(time, pixel, RgbColor(random(peak), random(peak), random(peak)));
+    }
+  }
+  else if (p == 1)
+  {
+    for (uint8_t pixel = 0; pixel < 16; pixel++)
+    {
+      uint16_t time = random(600,700);
+      strip.LinearFadePixelColor(time, pixel, RgbColor(0, 0, 0));
+    }
+  }
+  p = (p + 1) % 2; // next procedure and keep within the number of procedures
+  
+}
+
+void PickRandom(uint8_t peak)
+{
+
+  // pick random set of pixels to animate
+  uint8_t count = random(16);
+  while (count > 0)
+  {
+    uint8_t pixel = random(16);
+    
+    // configure the animations
+    RgbColor color; // = strip.getPixelColor(pixel);
+
+      color = RgbColor(random(peak), random(peak), random(peak));
+
+    
+    uint16_t time = random(100,400);
+    strip.LinearFadePixelColor( time, pixel, color);
+    
+    count--;
+  }
+}
+
+void LoopAround(uint8_t peak, uint16_t speed)
+{
+  // Looping around the ring sample
+  uint16_t prev;
+  RgbColor prevColor;
+  
+  // fade previous one dark
+  prev = (p + 11) % 16; 
+  strip.LinearFadePixelColor(speed, prev, RgbColor(0, 0, 0));
+  
+  // fade previous one dark
+  prev = (p + 12) % 16; 
+  prevColor = strip.GetPixelColor( prev );
+  prevColor.Darken(prevColor.CalculateBrightness() / 2);
+  strip.LinearFadePixelColor(speed, prev, prevColor);
+  
+  // fade previous one dark
+  prev = (p + 13) % 16; 
+  prevColor = strip.GetPixelColor( prev );
+  prevColor.Darken(prevColor.CalculateBrightness() / 2);
+  strip.LinearFadePixelColor(speed, prev, prevColor);
+  
+  // fade previous one dark
+  prev = (p + 14) % 16; 
+  prevColor = strip.GetPixelColor( prev );
+  prevColor.Darken(prevColor.CalculateBrightness() / 2);
+  strip.LinearFadePixelColor(speed, prev, prevColor);
+  
+  // fade previous one dark
+  prev = (p + 15) % 16; 
+  prevColor = strip.GetPixelColor( prev );
+  prevColor.Darken(prevColor.CalculateBrightness() / 2);
+  strip.LinearFadePixelColor(speed, prev, prevColor);
+  
+  // fade current one light
+  strip.LinearFadePixelColor(speed, p, RgbColor(random(peak), random(peak), random(peak)));
+  p = (p+1) % 16;
+}
+