import time
from machine import Pin
import neopixel

NUM_PIXELS=8
LED_PIN=2
np=neopixel.NeoPixel(Pin(LED_PIN),NUM_PIXELS)

def set_all(r,g,b):
    for i in range(NUM_PIXELS):
        np[i]=(r,g,b)
    np.write()
def clear_all():
    set_all(0,0,0)

def knight_rider(color=(255,0,0),delay=0.05):
    for i in range(NUM_PIXELS):
        clear_all()
        np[i]=color
        np.write()
        time.sleep(delay)

    for i in range(NUM_PIXELS-2,-1,-1):
        clear_all()
        np[i]=color
        np.write()
        time.sleep(delay)

def chase(color1=(255,0,0),color2=(0,0,255),delay=0.1):
    for i in range(NUM_PIXELS*2):
        clear_all()
        np[i%NUM_PIXELS]=color1
        np[(i+1)%NUM_PIXELS]=color2
        np.write()
        time.sleep(delay)

while True:
    print("runnimg knight rider effect ...")
    for _ in range(3):
        knight_rider((255,255,0),0.03)
        time.sleep(1)
    print("runnimg knight rider effect ...")
    chase((0,255,255),(255,0,0),0.08)
    time.sleep(1)