from machine import Pin
from neopixel import NeoPixel
from utime import sleep_ms

numpix = 24
np = NeoPixel(Pin(7), numpix)

b = 128          # brightness; 255-full, 128-half, 64-quarter
t = 50           # time [ms]
# ---------------------------------------------------------------------
template1=[(b, 0, 0), (b, 0, 0), (b, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, b, 0), (0, b, 0), (0, b, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, b), (0, 0, b), (0, 0, b), (0, 0, 0), (0, 0, 0), (0, 0, 0), (b, b, 0), (b, b, 0), (b, b, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0)]
template2=[(b, 0, b), (b, 0, b), (b, 0, b), (b, 0, b), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, b, b), (0, b, b), (0, b, b), (0, b, b), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (b, b, b), (b, b, b), (b, b, b), (b, b, b), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0)]
# ---------------------------------------------------------------------
while True:
    for _ in range(numpix):                     #--- shift right ---
        template1 = template1[-1:] + template1[:-1]  
        for i in range(numpix):
            np[i] = template1[i]
        np.write()
        sleep_ms(t)

    for _ in range(numpix):                      #--- shift left---
        template1 = template1[1:] + template1[:1] 
        for i in range(numpix):
            np[i] = template1[i]
        np.write()
        sleep_ms(t)   
    # ------------------------------------------------------------------
    for _ in range(numpix):                     #--- shift right ---
        template2 = template2[-1:] + template2[:-1]  
        for i in range(numpix):
            np[i] = template2[i]
        np.write()
        sleep_ms(t)

    for _ in range(numpix):                      #--- shift left---
        template2 = template2[1:] + template2[:1] 
        for i in range(numpix):
            np[i] = template2[i]
        np.write()
        sleep_ms(t)