Code

Here's the code for the dress shirt:

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//dress_shirt_v5_slow_color
//dress shirt slow color change, Paul Mirel 20131214
//Open Source. You may use or modify this code any way you wish.
//this code sets two pixels to two different, slowly changing colors. Both start green, and then drift away from each other.
//I based it on the Adafruit NeoPixel sample code.
//The recursive delay I added to rainbow() is a brute force way to get longer delays than the 8 bit integer allows.



#include <Adafruit_NeoPixel.h>

#define PIN 6

// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(2, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {
  rainbow(32); //slow color change for cocktail parties
  //rainbow(4); //faster color change for debugging

}


void rainbow(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256; j++) {
    strip.setPixelColor(0, Wheel(j & 255));
    strip.setPixelColor(1, Wheel((255-j) & 255));
    //strip.setPixelColor(1, Wheel((j+16) & 255));
    strip.show();
  for (i=0; i< wait; ++i) {
       delay (wait);
    }

  }
}



// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
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);
  }
}