Simple Arudino to test a string of NeoPixels. One LED scrolls out the length, as to reduce power constraints

Arduino NeoPixel Chaser

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
 #include <avr/power.h>
#endif

#define PIN        6 
#define NUMPIXELS 200

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 1 // Time (in milliseconds) to pause between pixels

void setup() {

  pixels.begin(); 
}

void loop() {
  pixels.clear(); 

  for(int i=0; i<NUMPIXELS; i++) { 
    pixels.setPixelColor(i-1, pixels.Color(0, 0, 0));
    pixels.setPixelColor(i, pixels.Color(128, 128, 128));

    pixels.show();

    delay(DELAYVAL);
  }
}