from machine import Pin, PWM
import time

led_pin = Pin(15)

# Initialize PWM on the LED pin
pwm = PWM(led_pin)
pwm.freq(1000)  # Set PWM frequency (1 kHz)

while True:
    # Gradually increase brightness
    for duty in range(0, 65535, 256):  # 256-step increments for smooth fade
        pwm.duty_u16(duty) 
        time.sleep(0.001)  # This introduces a
        #small delay of 0.01 seconds (10 milliseconds) between each step of the loop.The delay ensures that the brightness changes smoothly rather than instantly, creating a fading effect.

    # Gradually decrease brightness
    for duty in range(65535, -1, -256):
        pwm.duty_u16(duty)
        time.sleep(0.001)
# PWM operates with 16-bit resolution 2^16 =65536