#Import Pin, neopiexl and time modules.
from machine import Pin
import neopixel
import time

#Define the number of pin and LEDs connected to neopixel.
pin = Pin(26, Pin.OUT)
np = neopixel.NeoPixel(pin, 4) 

#brightness :0-255
brightness=100                                
colors=[[brightness,0,0],                    #red
        [0,brightness,0],                    #green
        [0,0,brightness],                    #blue
        [brightness,brightness,brightness],  #white
        [0,0,0]]                             #close

#Nest two for loops to make the module repeatedly display five states of red, green, blue, white and OFF.    
while True:
    for i in range(0,5):
        for j in range(0,4):
            np[j]=colors[i]
            np.write()
            time.sleep_ms(50)
        time.sleep_ms(500)
    time.sleep_ms(500)