Neopixel

Récupérer la bibliothèque neopixel.mpy sur https://circuitpython.org/libraries

# CircuitPython demo - NeoPixel
import time
import board
import neopixel

pixel_pin = board.IO18
num_pixels = 1

pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.3, auto_write=False)


def wheel(pos):
  # Input a value 0 to 255 to get a color value.
  # The colours are a transition r - g - b - back to r.
  if pos < 0 or pos > 255:
    return (0, 0, 0)
  if pos < 85:
    return (255 - pos * 3, pos * 3, 0)
  if pos < 170:
    pos -= 85
    return (0, 255 - pos * 3, pos * 3)
  pos -= 170
  return (pos * 3, 0, 255 - pos * 3)


def color_chase(color, wait):
  for i in range(num_pixels):
    pixels[i] = color
    time.sleep(wait)
    pixels.show()
    time.sleep(0.5)


def rainbow_cycle(wait):
    for j in range(255):
        for i in range(num_pixels):
            rc_index = (i * 256 // num_pixels) + j
            pixels[i] = wheel(rc_index & 255)
            pixels.show()
            time.sleep(wait)


            RED = (255, 0, 0)
            YELLOW = (255, 150, 0)
            GREEN = (0, 255, 0)
            CYAN = (0, 255, 255)
            BLUE = (0, 0, 255)
            PURPLE = (180, 0, 255)

while True:    
    rainbow_cycle(0)  # Increase the number to slow down the rainbow