code: async def pin_6_pwm_128(my_board):
      
      # set the pin mode
      await my_board.set_pin_mode(6, Constants.PWM)
  
      # set the pin to 128
      await my_board.analog_write(6, 128)
  
      # let the led stay lit for 3 seconds
      await asyncio.sleep(3)
  
      # shutdown
      await my_board.shutdown()
docs: Set digital pin 6 as a PWM output and set its output value to 128
      @param my_board: A PymataCore instance
      @return: No Return Value