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libraries/Adafruit_NeoPixel/examples/simple_new_operator/simple_new_operator.ino

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+// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
+// Released under the GPLv3 license to match the rest of the
+// Adafruit NeoPixel library
+// This sketch shows use of the "new" operator with Adafruit_NeoPixel.
+// It's helpful if you don't know NeoPixel settings at compile time or
+// just want to store this settings in EEPROM or a file on an SD card.
+
+#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?
+int pin         =  6; // On Trinket or Gemma, suggest changing this to 1
+
+// How many NeoPixels are attached to the Arduino?
+int numPixels   = 16; // Popular NeoPixel ring size
+
+// NeoPixel color format & data rate. See the strandtest example for
+// information on possible values.
+int pixelFormat = NEO_GRB + NEO_KHZ800;
+
+// Rather than declaring the whole NeoPixel object here, we just create
+// a pointer for one, which we'll then allocate later...
+Adafruit_NeoPixel *pixels;
+
+#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.
+  
+  // Right about here is where we could read 'pin', 'numPixels' and/or
+  // 'pixelFormat' from EEPROM or a file on SD or whatever. This is a simple
+  // example and doesn't do that -- those variables are just set to fixed
+  // values at the top of this code -- but this is where it would happen.
+
+  // Then create a new NeoPixel object dynamically with these values:
+  pixels = new Adafruit_NeoPixel(numPixels, pin, pixelFormat);
+
+  // Going forward from here, code works almost identically to any other
+  // NeoPixel example, but instead of the dot operator on function calls
+  // (e.g. pixels.begin()), we instead use pointer indirection (->) like so:
+  pixels->begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
+  // You'll see more of this in the loop() function below.
+}
+
+void loop() {
+  pixels->clear(); // Set all pixel colors to 'off'
+
+  // The first NeoPixel in a strand is #0, second is 1, all the way up
+  // to the count of pixels minus one.
+  for(int i=0; i<numPixels; i++) { // For each pixel...
+
+    // pixels->Color() takes RGB values, from 0,0,0 up to 255,255,255
+    // Here we're using a moderately bright green color:
+    pixels->setPixelColor(i, pixels->Color(0, 150, 0));
+
+    pixels->show();   // Send the updated pixel colors to the hardware.
+
+    delay(DELAYVAL); // Pause before next pass through loop
+  }
+}