#include <Adafruit_NeoPixel.h>
const int pin = 2;
const int ledsCount = 300;
Adafruit_NeoPixel strip(ledsCount, pin, NEO_GRB + NEO_KHZ800);

unsigned long timestamp;
const int time = 100;       // time in ms
const int ledOn = 2;
const int ledOff = 2;



void setup() {
  strip.begin();
  strip.setBrightness(100);
  strip.show(); 

  strip.setPixelColor(0, strip.Color(255,0,0));

  for(int i = 0; i < strip.numPixels(); i++){

  }
}

void loop() { 
  if(millis() - timestamp > time){
    timestamp = millis();
    moveOneLed();
  }
}

void moveOneLed(){
  uint32_t lastColor = strip.getPixelColor(strip.numPixels() - 1);
  for(int i = strip.numPixels() - 1; i > 0; i--){
    strip.setPixelColor(i, strip.getPixelColor(i-1));
  }
  strip.setPixelColor(0, lastColor);
  strip.show();
}