@classmethod
def update_all_sensors(cls, opt=None):
    """ Method iterates over all SensorCluster objects and updates 
            each sensor value and saves the values to the plant record.
                - Note that it must receive an open bus object.
            Usage: 
            Update all sensors exluding analog sensors that need power.
            - update_all_sensors()

            Update all sensors including soil moisture.
            - update_all_sensors("all")

        """
    for sensorobj in cls:
        sensorobj.update_instance_sensors(opt)
        sensorobj.save_instance_sensors()
