from machine import Pin
from utime import sleep
from neopixel import NeoPixel
from random import randrange
print("started")
NUM_LEDS = 16
leds = NeoPixel(Pin(15, Pin.OUT),NUM_LEDS)
st = 0.025

def turn_off(NUM_LEDS):
    for i in range(NUM_LEDS):
        leds[i] = [0,0,0]
    leds.write()

while True:
    x=0
    turn_off(NUM_LEDS)
    while True:
        
        color = [randrange(255),randrange(255),randrange(255)]
        print(NUM_LEDS-x)
        for i in range(NUM_LEDS-x):
            if i != 0:
                leds[i-1] = [0,0,0]
                leds[i] = color
                
                sleep(st)
                leds.write()
            else: leds[i] = color; leds.write()
        if x == NUM_LEDS:
            break
        x+=1
    sleep(3)