from machine import Pin, ADC
from time import sleep
import neopixel
import random


nl = 16
leds = neopixel.NeoPixel(Pin(12), nl)
pot = ADC(Pin(4, Pin.IN))
button = Pin(16, Pin.IN, Pin.PULL_UP)


while True: 

        for i in range(nl):
            if button.value() == 0:
                leds.fill([255, 0, 0])
                leds.write()
            else:  
                leds.fill([0, 0, 0])
                leds.write()  
                t=pot.read()/10000
                r = random.randint(0, 255)
                g = random.randint(0, 255)
                b = random.randint(0, 255)
                leds[i] = [r, g, b]
                leds.write()
                sleep(t)
                sleep(0.01)
                leds[i] = [0, 0, 0]
                sleep(t)
                sleep(0.01)
                print(t)