# Example using PWM to fade an LED.
# note: 65535 = 100% duty cycle
# 0 = 0% duty cycle
# PWM is an 8-bit number, shifted left 8x

import time
from machine import Pin, PWM

# Construct PWM object, with LED on Pin(25)
pwm = PWM(Pin(16))

# Set the PWM frequency.
pwm.freq(1000)

# Fade the LED in and out a few times.
duty = 0
direction = 1
while(1):
    duty += direction
    if duty > 255:
        duty = 255
        direction = -1
    elif duty < 0:
        duty = 0
        direction = 1
    pwm.duty_u16(duty << 8)
    time.sleep(0.002)