Knight_Rider 2.0

from machine import Pin, PWM
from time import sleep

led_pins = [13, 14, 15, 16, 17, 18, 19, 20, 21, 22]
leds = [PWM(Pin(pin)) for pin in led_pins]

fade_values = [65535, 20000, 15000, 8000, 0]
delay = 0.08
trailing_leds = 3

while True:
    # Fading in the forward direction
    for i in range(len(leds)):
        for j in range(trailing_leds + 1):
            if i - j >= 0:
                leds[i - j].duty_u16(fade_values[j])
        sleep(delay)
        for j in range(trailing_leds + 1):
            if i - j >= 0:
                leds[i - j].duty_u16(0)

    # Fading in the reverse direction
    for i in range(len(leds) - 2, -1, -1):
        for j in range(trailing_leds + 1):
            if i + j < len(leds):
                leds[i + j].duty_u16(fade_values[j])
        sleep(delay)
        for j in range(trailing_leds + 1):
            if i + j < len(leds):
                leds[i + j].duty_u16(0)