import time
from neopixel import NeoPixel
from machine import Pin


N_Leds = 2
NEO_PIN = Pin(14, Pin.OUT)

pix = NeoPixel(NEO_PIN, N_Leds)

print( f"There are {pix.n} pixels")

RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

time.sleep(0.1) # Wait for USB to become ready

pix[0] = RED
pix[1] = GREEN
pix.write()

while True:
    pix[0], pix[1] = pix[1], pix[0]
    pix.write()
    time.sleep(0.5) # Wait for USB to become ready