from machine import Pin
from neopixel import myNeopixel
import time

NUM_LEDS = 8
np = myNeopixel(NUM_LEDS, 16)

red   = 0                #red
green = 0                #green
blue  = 0                #blue

# 255を2色で分ける
def wheel(pos):
    global red, green, blue

    # 2色選択
    WheelPos = pos % 255

    # 3分割しているので1/3の値を求める
    one_third = (WheelPos % 85)
    big   = one_third * 3
    small = 255 - big

    # 赤<=>緑
    if WheelPos < 85:
        red   = small
        green = big
        blue  = 0
    # 緑<=>青
    elif 85 <= WheelPos < 170:
        red   = 0
        green = small
        blue  = big
    # 青<=>赤
    else :
        red   = big
        green = 0
        blue  = small

np.brightness(20)
while True:
    for i in range(0, 255):
        for j in range(0, 8):
            wheel(i + j*255 // 8)
            np.set_pixel(j, red, green, blue)
        np.show()
        time.sleep_ms(1)