from machine import Pin
import time
import neopixel

PIN  =       13
NUMPIXELS =  64          # NeoPixel ring size
pixDELAY  =  100         # Delay for pixel persistence

# Start Function
if __name__ == '__main__':
  pixels = neopixel.NeoPixel(Pin(PIN), NUMPIXELS)

  while True:
    for n in range(0,8):
      start = n*8 + 1
      end = n*9 + 1
      for x in range(start,end+1):
        pixels[x-1] = (255, 0, 0)
      pixels.write()
      time.sleep_ms(pixDELAY)
    pixels.fill((0, 0, 0))
    time.sleep_ms(pixDELAY)

    for n in range(1,9):
      start = n*7 + 1
      end = n*8 + 0
      for x in range(start,end+1):
        pixels[x-1] = (255, 0, 0)
      pixels.write()
      time.sleep_ms(pixDELAY)
    pixels.fill((0, 0, 0))
    time.sleep_ms(pixDELAY)