title: gpiozero.exc.PinPWMUnsupported: PWM is not supported on pin GPIO7 (Raspberry Pi 4B)
body: <p>I am working on my first Raspberry Pi project while following a course for creating a line-following robot. <a href="https://www.futurelearn.com/courses/robotics-with-raspberry-pi/4/todo/97316" rel="nofollow noreferrer">This</a> is the course. I followed all the instructions and connected the pins as it describes but when I run the code on the Raspberry Pi OS it throws an error:</p>
  <blockquote>
  <p>gpiozero.exc.PinPWMUnsupported: PWM is not supported on pin GPIO7
  This is the code:</p>
  </blockquote>
  <pre><code>from gpiozero import Robot
  from time import sleep
  
  my_robot = Robot(left=(7,8), right=(9,10))
  
  my_robot.forward()
  sleep(1)
  my_robot.stop()
  </code></pre>
  <p>I tried to search for solutions and checked the <a href="https://gpiozero.readthedocs.io/en/stable/api_exc.html#gpiozero.PinPWMError" rel="nofollow noreferrer">official documentation</a> but it hasn't been helpful. How can I fix this?</p>