public override void Update()
 {
     if (group.IsNotEmpty())
     {
         if (!WaterLevel.GetWaterLevelGroupAnalogSensorConnected(group))
         {
             textBox.text  = "--";
             label.Visible = true;
         }
         else
         {
             currentValue  = WaterLevel.GetWaterLevelGroupLevel(group);
             label.Visible = false;
         }
     }
 }