RGB灯

robotbit扩展板4个rgb灯，r-红，g-绿，b-蓝，值为0~255，可模拟出256*256*256种颜色。

from microbit import *

import neopixel
r = 0
g = 0
b = 0
np = neopixel.NeoPixel(pin16, 4)
for r in range(0,256,10):
    for g in range(0,256,10):
        for b in range(0,256,10):
            np[0] = (r, g, b)
            sleep(200)
            np.show()