python_microcontrollers/02_input_and_output/code/Rainbow_light.py at main · ColinKerr/python_microcontrollers · GitHub

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from machine import Pin
import neopixel
import time
pin = Pin(48, Pin.OUT)
np = neopixel.NeoPixel(pin, 8)

brightness=0.1         #brightness: 0-1.0
red=0                  #red
green=0                #green
blue=0                 #blue

def wheel(pos):
    global red,green,blue
    WheelPos=pos%255
    if WheelPos<85:
        red=(255-WheelPos*3)
        green=(WheelPos*3)
        blue=0
    elif WheelPos>=85 and WheelPos<170:
        WheelPos -= 85;
        red=0
        green=(255-WheelPos*3)
        blue=(WheelPos*3)
    else :
        WheelPos -= 170;
        red=(WheelPos*3)
        green=0
        blue=(255-WheelPos*3)

while True:
    for i in range(0,255):
        for j in range(0,8):
            wheel(i+j*255//8)
            np[j]=(int(red*brightness),int(green*brightness),int(blue*brightness))
            np.write()
        time.sleep_ms(5)