1  # SPDX-FileCopyrightText: 2018 Kattni Rembor for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import time
 6  
 7  import board
 8  import pwmio
 9  
10  led = pwmio.PWMOut(board.D13, frequency=5000, duty_cycle=0)
11  
12  while True:
13      for i in range(100):
14          # PWM LED up and down
15          if i < 50:
16              led.duty_cycle = int(i * 2 * 65535 / 100)  # Up
17          else:
18              led.duty_cycle = 65535 - int((i - 50) * 2 * 65535 / 100)  # Down
19          time.sleep(0.01)