from machine import Pin, PWM
import time

# 青色ピン(GP13)をPWMとして設定
led_blue = PWM(Pin(13))
led_blue.freq(1000)  # 周波数を1000Hzに設定

while True:
    # 徐々に明るくする (0 -> 65535)
    print("Fade In...")
    for brightness in range(0, 65536, 1000):
        led_blue.duty_u16(brightness)
        time.sleep(0.01)
    
    # 徐々に暗くする (65535 -> 0)
    print("Fade Out...")
    for brightness in range(65535, -1, -1000):
        led_blue.duty_u16(brightness)
        time.sleep(0.01)