/ 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>

#endif

// Which pin on the Arduino is connected to the NeoPixels?

// On a Trinket or Gemma we suggest changing this to 1

#define PIN            6

// How many NeoPixels are attached to the Arduino?

#define NUMPIXELS      24

// When we setup 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 = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int delayval = 500; // delay for half a second

void setup() {

  // This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket

#if defined (__AVR_ATtiny85__)

  if (F_CPU == 16000000) clock_prescale_set(clock_div_1);

#endif

  // End of trinket special code

  pixels.begin(); // This initializes the NeoPixel library.

}

void loop() {

  // For a set of NeoPixels the first NeoPixel is 0, second is 1, all the way up to the count of pixels minus one.

  for(int i=0;i<NUMPIXELS;i++){

    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255

    pixels.setPixelColor(i, pixels.Color(0,150,0)); // Moderately bright green color.

    pixels.show(); // This sends the updated pixel color to the hardware.

    delay(delayval); // Delay for a period of time (in milliseconds).

  }

}

 The NeoPixel ring will act as the Navy Pier’s Centennial Wheel and the NeoPixel strip will act as Sears Tower’s lights. Also, the Chicago Skyline will be created with interactive LEDs in each building that one can place on each 3V coin battery.