diff --git a/measurement.py b/measurement.py
index d17cd7d..2a45ab5 100644
--- a/measurement.py
+++ b/measurement.py
@@ -43,7 +43,7 @@ def measure_all_sensors(debug, filtered_temperature, ds18b20Sensors, bme680Senso
                             ds18b20_temperature = ds18b20_temperature-float(sensor["offset"])
                         ds18b20_temperature = float("{0:.2f}".format(ds18b20_temperature)) # round to two decimals
                         ts_fields.update({sensor["ts_field"]: ds18b20_temperature})
-                elif 'ts_field' and 'device_id' in sensor:
+                elif 'ts_field' in sensor:
                     # Case for filtered_temperature was not filled, use direct measured temperture in this case
                     ds18b20_temperature = measure_temperature(sensor)
                     if sensor["ts_field"] and ds18b20_temperature is not None:
diff --git a/read_bme680.py b/read_bme680.py
index 44abe45..5a527ba 100644
--- a/read_bme680.py
+++ b/read_bme680.py
@@ -34,7 +34,7 @@ def initBME680(ts_sensor):
             print('BME680: The Temperature Offset is ' + str(offset) + ' °C')
         except:
             offset = 0
-            print('BME680: The Temperature Offset is default: ' + str(offset) + '°C')
+            #print('BME680: The Temperature Offset is default: ' + str(offset) + '°C')
 
         # These oversampling settings can be tweaked to change the balance between accuracy and noise in the data.
         sensor.set_humidity_oversample(bme680.OS_2X)
@@ -57,10 +57,9 @@ def initBME680(ts_sensor):
 
 def initBME680FromMain(ts_sensor):
     if isSMBusConnected():
-        print("A Sensor (eg. BME680/WittyPi) is connected to SMBus.")
         return initBME680(ts_sensor)
     else:
-        print("SMBus is not connected.")
+        print("No I2C sensor connected to SMBus. Please check sensor or remove BME680 from settings.")
         return 0
 
 def burn_in_bme680(sensor, burn_in_time):
diff --git a/read_ds18b20.py b/read_ds18b20.py
index 7a6617d..62bf7d5 100644
--- a/read_ds18b20.py
+++ b/read_ds18b20.py
@@ -15,24 +15,30 @@
 
 def measure_temperature(sensor):
     try:
+        if 'device_id' not in sensor:
+            sensor["device_id"] = "undefined"
+
         if 'pin' in sensor and isinstance(sensor["pin"], (int)) and sensor["pin"] > 0:
+            print("GPIO" + str(sensor["pin"]) + " is defined as 3.3V power source for Ds18b20 '" + sensor["device_id"] + "'")
             setup_gpio(sensor["pin"])
 
+        if sensor["device_id"] != "undefined":
+
             if (os.path.isdir("/sys/bus/w1/devices/" + sensor["device_id"]) == False):
-                error_log("Info: Resetting 3.3V GPIO " + str(sensor["pin"]) + " because " + sensor["device_id"] + " was missing.")
+                error_log("Info: Resetting 3.3V GPIO" + str(sensor["pin"]) + " because Ds18b20 with device-id '" + sensor["device_id"] + "' was missing.")
                 reset_ds18b20_3V(sensor["pin"])
 
-        # read 1-wire slave file
-        with open('/sys/bus/w1/devices/' + sensor["device_id"] + '/w1_slave', 'r') as file:
-            file_content = file.read()
-            file.close()
+            # read 1-wire slave file
+            with open('/sys/bus/w1/devices/' + sensor["device_id"] + '/w1_slave', 'r') as file:
+                file_content = file.read()
+                file.close()
 
-            # read temperature and convert temperature
-            string_value = file_content.split("\n")[1].split(" ")[9]
-            temperature = float(string_value[2:]) / 1000
-            temperature = float('%6.2f' % temperature)
+                # read temperature and convert temperature
+                string_value = file_content.split("\n")[1].split(" ")[9]
+                temperature = float(string_value[2:]) / 1000
+                temperature = float('%6.2f' % temperature)
 
-            return temperature
+                return temperature
 
     except FileNotFoundError:
         error_log("Warning: Cannot find Device-ID from Ds18b20 Sensor " + sensor["device_id"])