# Fade LEDs on and off
from time import sleep_ms
from machine import Pin, PWM

LED = Pin(17, Pin.OUT)
LED = PWM(Pin(17))
LED.freq(100)

x = 0
dx = 100
    
while(1):
    x += dx
    LED.duty_u16(x)
    if(x > 65000):
        dx = -abs(dx)
    if(x <= 0)
        dx = abs(dx)
    sleep_ms(1)