from machine import Pin 
from utime import sleep 
import neopixel 
import random
import time

NUM_LEDS = 60
poz=0
leds = neopixel. NeoPixel (Pin(15), NUM_LEDS)

while True:
    for x in range(60):
        leds[x]=[255,255,255]
        leds.write()
        sleep(0.1)
        if x!=poz:
            leds[x]=[0,0,0]
            leds.write()

    leds[poz-1]=[0,0,0]
    poz+=1