#include <Adafruit_NeoPixel.h>
#include <avr/power.h>

#define NUM_LEDS 100
#define DATA_PIN 3

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUM_LEDS, DATA_PIN, NEO_GRB + NEO_KHZ800);

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

void loop() {
  for (int i=0; i<NUM_LEDS; i++){

    pixels.setPixelColor(i, pixels.Color(random(0, 256), random(0, 256), random(0, 256)));
    pixels.show();
    delay(50);
    pixels.setPixelColor(i, pixels.Color(random(0, 64), random(0, 64), random(0, 64)));
    pixels.show();
  }
}