#include <Adafruit_NeoPixel.h> 

#define PIN       6 

Adafruit_NeoPixel pixels(16, PIN);

void setup() {   pixels.begin();  }

void loop() {   pixels.clear(); 
  for(int i=0; i<16; i++) { 
    // pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(0, 150, 0));  // a moderately bright green color:
                                     // (R,  G,  B)
    pixels.show(); 
    delay (200) ; 
  }
}