from machine import Pin
from machine import PWM
import time

LED_RED = PWM(Pin(23), freq=1000, duty=0)
LED_GREEN = PWM(Pin(22), freq=1000, duty=0)
LED_BLUE = PWM(Pin(21), freq=1000, duty=0)

while True:
    LED_RED.duty(0)
    time.sleep(1.0)

    LED_RED.duty(400)
    time.sleep(1.0)

    LED_RED.duty(800)
    time.sleep(1.0)

    LED_RED.duty(1023)
    time.sleep(1.0)