import machine, neopixel
import time

num_neopixels = 16
pin_neopixels = 4

ring = neopixel.NeoPixel(machine.Pin(pin_neopixels), num_neopixels)

def clear_all () :
    for led in range(num_neopixels) :
        ring[led] = (0,0,0)
        ring.write()
        
def leds (r , g , b) :
    for led in range(num_neopixels) :
        ring[led] = (r,g,b)
        ring.write()

while True :
    leds (250 , 250 , 0)
    time.sleep(0.5)
    clear_all ()
    time.sleep(0.5)