micropython/examples/rp2/pwm_fade.py

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# Example using PWM to fade an LED.
import time
from machine import Pin, PWM
# Construct PWM object, with LED on Pin(25).
pwm = PWM(Pin(25))
# Set the PWM frequency.
pwm.freq(1000)
# Fade the LED in and out a few times.
duty = 0
direction = 1
for _ in range(8 * 256):
duty += direction
if duty > 255:
duty = 255
direction = -1
elif duty < 0:
duty = 0
direction = 1
pwm.duty_u16(duty * duty)
time.sleep(0.001)