// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// Released under the GPLv3 license to match the rest of the
// Adafruit NeoPixel library

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
 #include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif

// Which pin on the Arduino is connected to the NeoPixels?
#define PIN        6 // On Trinket or Gemma, suggest changing this to 1

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 8 // Popular NeoPixel ring size

// When setting up the NeoPixel library, we tell it how many pixels,
// and which pin to use to send signals. Note that for older NeoPixel
// strips you might need to change the third parameter -- see the
// strandtest example for more information on possible values.
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels

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):
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
  clock_prescale_set(clock_div_1);
#endif
  // END of Trinket-specific code.

  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
}


// Color get_rainbow_color(int index, int total) 
// {
//   return Color(0, 0, 0);
// }


void one_light()
{
  for(int i = 0; i < 3; i++)
  {
    pixels.setPixelColor(0, pixels.Color(0, 0, 0));
    pixels.show();
    delay(500);
    pixels.setPixelColor(0, pixels.Color(255, 0, 255));
    pixels.show();  
    delay(500);
  }
}

void circle_led3()
{
    for(int count=0; count<8*5; count++) { 
      pixels.clear();
      pixels.setPixelColor(count % 8, pixels.Color(0, 150, 0));
      pixels.setPixelColor((count-1) % 8, pixels.Color(0, 150, 0));
      pixels.setPixelColor((count-2) % 8, pixels.Color(0, 150, 0));
      pixels.show();   
      delay(150);
    }
}

void circle_fast()
{
  int delay_time = 200;
  for(int j = 0; j < 5; j++)
  {
    for(int i=0; i<NUMPIXELS; i++) { 
      pixels.setPixelColor(i, pixels.Color(0, 150, 0));
      pixels.show();   
      delay(delay_time);
    }
    for(int i=0; i<NUMPIXELS; i++) { 
      pixels.setPixelColor(i, pixels.Color(0, 0, 0));
      pixels.show();   
      delay(delay_time);
      delay_time -= 5;
    }
  }
}

void breathe() {
  float sinVal, r;
  for(int i = 0; i < 255; i++) {
    sinVal =  126 * sin((float)i/100.0) + 128;
    r = constrain(sinVal, 2, 255);
    pixels.setPixelColor(0, pixels.Color(r, 0, 0));
    pixels.show();   
    delay(10);
  }
}

void loop() {
  pixels.clear(); // Set all pixel colors to 'off'
  // one_light();
  // circle_led3();
  // circle_fast();
  breathe();
}