1  # SPDX-FileCopyrightText: 2018 Kattni Rembor for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  """CircuitPython Essentials: PWM with Fixed Frequency example."""
 6  import time
 7  import board
 8  import pwmio
 9  
10  # LED setup for most CircuitPython boards:
11  led = pwmio.PWMOut(board.LED, frequency=5000, duty_cycle=0)
12  # LED setup for QT Py M0:
13  # led = pwmio.PWMOut(board.SCK, frequency=5000, duty_cycle=0)
14  
15  while True:
16      for i in range(100):
17          # PWM LED up and down
18          if i < 50:
19              led.duty_cycle = int(i * 2 * 65535 / 100)  # Up
20          else:
21              led.duty_cycle = 65535 - int((i - 50) * 2 * 65535 / 100)  # Down
22          time.sleep(0.01)