NeoPixelsBlueWheel.ino

#include <Adafruit_NeoPixel.h>

#define PIN 6

Adafruit_NeoPixel strip = Adafruit_NeoPixel(20, PIN, NEO_GRB + NEO_KHZ800);

int fadeControl = 255;//will hold the current brightness level
int fadeDirection = -1;//change sigen to fade up or down

void setup() {
  strip.begin();
  strip.show();
}

void loop() {
  bluepulse(150);
}

void bluepulse(uint8_t fadeStep) {
  uint16_t i, j;

  for(j=0; j<256; j++) {
    for(i=0; i<20; i++) {
      strip.setPixelColor(i, 0, 0, Wheel((i+j)));
      //strip.setPixelColor(i, (0, 0, 127)); //Blue Color pixels 

strip.setBrightness(fadeControl);//set the strip brightness
  
  fadeControl = fadeControl + fadeDirection;//increment the brightness value
  if (fadeControl <20 || fadeControl > 255)
  //If the brightness value has gone past its limits...
  {
    fadeDirection = fadeDirection * -1;//change the direction...
    fadeControl = fadeControl + fadeDirection;//...and start back.
  }
    }
   
  strip.show();
  delay(fadeStep);//wait a bit before doing it again.

  }
}
  
  
  
uint32_t Wheel(byte WheelPos) {
  if(WheelPos < 85) {
   return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  } else if(WheelPos < 170) {
   WheelPos -= 85;
   return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else {
   WheelPos -= 170;
   return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
}