// NeoPixel test program showing use of the WHITE channel for RGBW
// pixels only (won't look correct on regular RGB NeoPixel strips).

#include <Adafruit_NeoPixel.h>

// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1:
#define LED_PIN     6

// How many NeoPixels are attached to the Arduino?
#define LED_COUNT  16

// NeoPixel brightness, 0 (min) to 255 (max)
#define BRIGHTNESS 255 // Set BRIGHTNESS to about 1/5 (max = 255)
#define att 20
#define delta 2
#define delta2 30
int pos=-1;
int k=0;
// Declare our NeoPixel strip object:
// Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel strip = Adafruit_NeoPixel(LED_COUNT+1, LED_PIN, NEO_GRB + NEO_KHZ800);
// Argument 1 = Number of pixels in NeoPixel strip
// Argument 2 = Arduino pin number (most are valid)
// Argument 3 = Pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)

void setup() {
  // These lines are specifically to support the Adafruit Trinket 5V 16 MHz.
  // Any other board, you can remove this part (but no harm leaving it):
  // END of Trinket-specific code.

  strip.begin();           // INITIALIZE NeoPixel strip object (REQUIRED)
  strip.clear();
  strip.show();            // Turn OFF all pixels ASAP
  strip.setBrightness(BRIGHTNESS);

  
  for(int j=0; j<=255; j=j+delta) {
    //for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(j,j,j));
      strip.setPixelColor(LED_COUNT, strip.Color(j,j,j));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(k,k,k));}
//      else {strip.setPixelColor(pos+1, strip.Color(k,k,k));}
      strip.show();
      delay(att);
    //}
//    strip.show();
//    delay(att);
  }


  for(int j=255; j>=0; j=j-delta) {
//    for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(255,j,j));
      strip.setPixelColor(LED_COUNT, strip.Color(255,j,j));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(255,k,k));}
//      else {strip.setPixelColor(pos+1, strip.Color(255,k,k));}
      strip.show();
      delay(att);
//    }
//    strip.show();
//    delay(att);
  }
}

void loop() {
  // Fill along the length of the strip in various colors...

  for(int j=0; j<=255; j=j+delta) {
//    for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(255,j,0));
      strip.setPixelColor(LED_COUNT, strip.Color(255,j,0));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(255,k,0));}
//      else {strip.setPixelColor(pos+1, strip.Color(255,k,0));}
      strip.show();
      delay(att);
//    }
//    strip.show();
//    delay(att);
  }

  for(int j=255; j>=0; j=j-delta) {
//    for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(j,255,0));
      strip.setPixelColor(LED_COUNT, strip.Color(j,255,0));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(k,255,0));}
//      else {strip.setPixelColor(pos+1, strip.Color(k,255,0));}
      strip.show();
      delay(att);
//    }
//    strip.show();
//    delay(att);
  }

  for(int j=0; j<=255; j=j+delta) {
//    for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(0,255,j));
      strip.setPixelColor(LED_COUNT, strip.Color(0,255,j));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(0,255,k));}
//      else {strip.setPixelColor(pos+1, strip.Color(0,255,k));}
      strip.show();
      delay(att);
//    }
//    strip.show();
//    delay(att);
  }

  for(int j=255; j>=0; j=j-delta) {
//    for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(0,j,255));
      strip.setPixelColor(LED_COUNT, strip.Color(0,j,255));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(0,k,255));}
//      else {strip.setPixelColor(pos+1, strip.Color(0,k,255));}
      strip.show();
      delay(att);
//    }
//    strip.show();
//    delay(att);
  }

  for(int j=0; j<=255; j=j+delta) {
//    for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(j,0,255));
      strip.setPixelColor(LED_COUNT, strip.Color(j,0,255));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(k,0,255));}
//      else {strip.setPixelColor(pos+1, strip.Color(k,0,255));}
      strip.show();
      delay(att);
//    }
//    strip.show();
//    delay(att);
  }
 
  for(int j=255; j>=0; j=j-delta) {
//    for(int i=0; i<LED_COUNT; i++) {
      pos++;
      if ( pos==LED_COUNT ) { pos=0; }
      strip.setPixelColor(pos, strip.Color(255,0,j));
      strip.setPixelColor(LED_COUNT, strip.Color(255,0,j));
      if (j<255-delta2) {k=j+delta2;} else {k=j-delta2;}
//      if (pos==LED_COUNT-1) {strip.setPixelColor(0, strip.Color(255,0,k));}
//      else {strip.setPixelColor(pos+1, strip.Color(255,0,k));}
      strip.show();
      delay(att);
//    }
//    strip.show();
//    delay(att);
  }

}