import machine
import time

# Define the pin for the LED
led_pin = machine.Pin(5, machine.Pin.OUT)  # Assuming pin 5 for the LED

# Create a PWM object
pwm = machine.PWM(led_pin)

# Set the PWM frequency (in Hz)
pwm.freq(1000)  # Adjust as needed

while True:
    # Increase brightness to maximum
    for duty_cycle in range(1024):
        pwm.duty(duty_cycle)
        time.sleep(0.005)  # Adjust the delay for desired fade speed

    # Set to maximum brightness (100%) and hold for 5 seconds
    pwm.duty(1023)
    time.sleep(5)  # Hold at maximum brightness for 5 seconds

    # Decrease brightness to 50%
    for duty_cycle in range(1023, 512, -1):  # Fade from 100% to 50%
        pwm.duty(duty_cycle)
        time.sleep(0.005)  # Adjust the delay for desired fade speed
    
    # Set brightness to 50% and hold for 5 seconds
    pwm.duty(512)  # 50% brightness
    time.sleep(5)  # Hold at 50% brightness for 5 seconds