from machine import Pin, PWM
import time

# Configure the LED pin and set it as an output
led_pin = Pin(15, Pin.OUT)  # Replace with the appropriate GPIO pin number

# Create a PWM object with a frequency of 1000 Hz
pwm = PWM(led_pin, freq=1000)

# Gradually increase brightness
for duty in range(0, 65536, 1024):
    pwm.duty_u16(duty)
    time.sleep(0.01)  # Small delay for visual effect

# Gradually decrease brightness
for duty in range(65535, -1, -1024):
    pwm.duty_u16(duty)
    time.sleep(0.01)  # Small delay for visual effect

# Turn off the LED
pwm.deinit()