docs: def update_soil_moisture(self):
          """ Method will select the ADC module,
                  turn on the analog sensor, wait for voltage settle, 
                  and then digitize the sensor voltage. 
              Voltage division/signal loss is accounted for by 
                  scaling up the sensor output.
                  This may need to be adjusted if a different sensor is used
          """
          SensorCluster.analog_sensor_power(SensorCluster.bus, "on")  # turn on sensor
          sleep(.2)
          TCA_select(SensorCluster.bus, self.mux_addr, SensorCluster.adc_chan)
          moisture = get_ADC_value(
              SensorCluster.bus, SensorCluster.adc_addr, SensorCluster.moisture_chan)
          status = TCA_select(SensorCluster.bus, self.mux_addr, "off")  # Turn off mux.
          SensorCluster.analog_sensor_power(SensorCluster.bus, "off")  # turn off sensor
          if (moisture >= 0):
              soil_moisture = moisture/2.048 # Scale to a percentage value 
              self.soil_moisture = round(soil_moisture,3)
          else:
              raise SensorError(
                  "The soil moisture meter is not configured correctly.")
          return status