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+// Simple demonstration on using an input device to trigger changes on your
+// NeoPixels. Wire a momentary push button to connect from ground to a
+// digital IO pin. When the button is pressed it will change to a new pixel
+// animation. Initial state has all pixels off -- press the button once to
+// start the first animation. As written, the button does not interrupt an
+// animation in-progress, it works only when idle.
+
+#include <Adafruit_NeoPixel.h>
+#ifdef __AVR__
+ #include <avr/power.h> // Required for 16 MHz Adafruit Trinket
+#endif
+
+// Digital IO pin connected to the button. This will be driven with a
+// pull-up resistor so the switch pulls the pin to ground momentarily.
+// On a high -> low transition the button press logic will execute.
+#define BUTTON_PIN  1
+
+#define LED_PIN     2  // in-switch LED
+
+#define PIXEL_PIN   3  // Digital IO pin connected to the NeoPixels.
+
+#define PIXEL_COUNT 4  // Number of NeoPixels
+
+// Declare our NeoPixel strip object:
+Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_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)
+
+boolean oldState = HIGH;
+int     mode     = 0;    // Currently-active animation mode, 0-9
+
+void setup() {
+  pinMode(BUTTON_PIN, INPUT_PULLUP);
+  strip.begin(); // Initialize NeoPixel strip object (REQUIRED)
+  strip.show();  // Initialize all pixels to 'off'
+  pinMode(LED_PIN, OUTPUT);
+  digitalWrite(LED_PIN, LOW);
+}
+
+void loop() {
+  // Get current button state.
+  boolean newState = digitalRead(BUTTON_PIN);
+
+  // Check if state changed from high to low (button press).
+  if((newState == LOW) && (oldState == HIGH)) {
+    // Short delay to debounce button.
+    delay(20);
+    // Check if button is still low after debounce.
+    newState = digitalRead(BUTTON_PIN);
+    if(newState == LOW) {      // Yes, still low
+      digitalWrite(LED_PIN, !digitalRead(LED_PIN)); //Toggle the in-switch LED
+      if(++mode > 8) mode = 0; // Advance to next mode, wrap around after #8
+      switch(mode) {           // Start the new animation...
+        case 0:
+          colorWipe(strip.Color(  0,   0,   0), 50);    // Black/off
+          break;
+        case 1:
+          colorWipe(strip.Color(255,   0,   0), 50);    // Red
+          break;
+        case 2:
+          colorWipe(strip.Color(  0, 255,   0), 50);    // Green
+          break;
+        case 3:
+          colorWipe(strip.Color(  0,   0, 255), 50);    // Blue
+          break;
+        case 4:
+          theaterChase(strip.Color(127, 127, 127), 50); // White
+          break;
+        case 5:
+          theaterChase(strip.Color(127,   0,   0), 50); // Red
+          break;
+        case 6:
+          theaterChase(strip.Color(  0,   0, 127), 50); // Blue
+          break;
+        case 7:
+          rainbow(10);
+          break;
+        case 8:
+          theaterChaseRainbow(50);
+          break;
+      }
+    }
+  }
+
+  // Set the last-read button state to the old state.
+  oldState = newState;
+}
+
+// Fill strip pixels one after another with a color. Strip is NOT cleared
+// first; anything there will be covered pixel by pixel. Pass in color
+// (as a single 'packed' 32-bit value, which you can get by calling
+// strip.Color(red, green, blue) as shown in the loop() function above),
+// and a delay time (in milliseconds) between pixels.
+void colorWipe(uint32_t color, int wait) {
+  for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
+    strip.setPixelColor(i, color);         //  Set pixel's color (in RAM)
+    strip.show();                          //  Update strip to match
+    delay(wait);                           //  Pause for a moment
+  }
+}
+
+// Theater-marquee-style chasing lights. Pass in a color (32-bit value,
+// a la strip.Color(r,g,b) as mentioned above), and a delay time (in ms)
+// between frames.
+void theaterChase(uint32_t color, int wait) {
+  for(int a=0; a<10; a++) {  // Repeat 10 times...
+    for(int b=0; b<3; b++) { //  'b' counts from 0 to 2...
+      strip.clear();         //   Set all pixels in RAM to 0 (off)
+      // 'c' counts up from 'b' to end of strip in steps of 3...
+      for(int c=b; c<strip.numPixels(); c += 3) {
+        strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'
+      }
+      strip.show(); // Update strip with new contents
+      delay(wait);  // Pause for a moment
+    }
+  }
+}
+
+// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.
+void rainbow(int wait) {
+  // Hue of first pixel runs 3 complete loops through the color wheel.
+  // Color wheel has a range of 65536 but it's OK if we roll over, so
+  // just count from 0 to 3*65536. Adding 256 to firstPixelHue each time
+  // means we'll make 3*65536/256 = 768 passes through this outer loop:
+  for(long firstPixelHue = 0; firstPixelHue < 3*65536; firstPixelHue += 256) {
+    for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
+      // Offset pixel hue by an amount to make one full revolution of the
+      // color wheel (range of 65536) along the length of the strip
+      // (strip.numPixels() steps):
+      int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
+      // strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or
+      // optionally add saturation and value (brightness) (each 0 to 255).
+      // Here we're using just the single-argument hue variant. The result
+      // is passed through strip.gamma32() to provide 'truer' colors
+      // before assigning to each pixel:
+      strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
+    }
+    strip.show(); // Update strip with new contents
+    delay(wait);  // Pause for a moment
+  }
+}
+
+// Rainbow-enhanced theater marquee. Pass delay time (in ms) between frames.
+void theaterChaseRainbow(int wait) {
+  int firstPixelHue = 0;     // First pixel starts at red (hue 0)
+  for(int a=0; a<30; a++) {  // Repeat 30 times...
+    for(int b=0; b<3; b++) { //  'b' counts from 0 to 2...
+      strip.clear();         //   Set all pixels in RAM to 0 (off)
+      // 'c' counts up from 'b' to end of strip in increments of 3...
+      for(int c=b; c<strip.numPixels(); c += 3) {
+        // hue of pixel 'c' is offset by an amount to make one full
+        // revolution of the color wheel (range 65536) along the length
+        // of the strip (strip.numPixels() steps):
+        int      hue   = firstPixelHue + c * 65536L / strip.numPixels();
+        uint32_t color = strip.gamma32(strip.ColorHSV(hue)); // hue -> RGB
+        strip.setPixelColor(c, color); // Set pixel 'c' to value 'color'
+      }
+      strip.show();                // Update strip with new contents
+      delay(wait);                 // Pause for a moment
+      firstPixelHue += 65536 / 90; // One cycle of color wheel over 90 frames
+    }
+  }
+}