hardware:
  raspberrypi:
    fan:
      has_fan: True
      controller: /usr/local/bin/fan_ctrl.py
      service_name: fancontroller

systemd:
  service:
   fancontroller:
      Unit:
        Description: Controlling the Fan via PWM
        After: base.target

      Service:
        ExecStart: /usr/local/bin/fan_ctrl.py 
        User: pi
        Group: gpio
        Environment: RPI_FANPIN=21 
      Install:
        WantedBy: multi-user.target