from time import sleep
from machine import Pin, PWM
sleep(0.1) # Wait for USB to become ready

print("Hello, Pi Pico!")

# full brightness LED - no PWM control
ledBright = Pin(0, Pin.OUT)
ledBright.toggle()

# dimmable LED - with PWM control
ledDimmable = PWM(Pin(3))
ledDimmable.freq(50)

while True:
    for duty in range(0, 65536, 256):  # Fade in
        ledDimmable.duty_u16(duty)
        sleep(0.02)
    for duty in range(65535, -1, -256):  # Fade out
        ledDimmable.duty_u16(duty)
        sleep(0.02)