diff --git a/scripts/main.py b/scripts/main.py
index aa1fb14..c42f66f 100644
--- a/scripts/main.py
+++ b/scripts/main.py
@@ -53,6 +53,9 @@ import planktoscope.segmenter
 # Import the planktonscope LED module
 import planktoscope.light
 
+# Import the planktonscope uuidName module
+import planktoscope.uuidName
+
 
 # global variable that keeps the wheels spinning
 run = True
@@ -75,18 +78,17 @@ if __name__ == "__main__":
     # check if gpu_mem configuration is at least 256Meg, otherwise the camera will not run properly
     with open("/boot/config.txt", "r") as config_file:
         for i, line in enumerate(config_file):
-            if line.startswith("gpu_mem"):
-                if int(line.split("=")[1].strip()) < 256:
-                    logger.error(
-                        "The GPU memory size is less than 256, this will prevent the camera from running properly"
-                    )
-                    logger.error(
-                        "Please edit the file /boot/config.txt to change the gpu_mem value to at least 256"
-                    )
-                    logger.error(
-                        "or use raspi-config to change the memory split, in menu 7 Advanced Options, A3 Memory Split"
-                    )
-                    sys.exit(1)
+            if line.startswith("gpu_mem") and int(line.split("=")[1].strip()) < 256:
+                logger.error(
+                    "The GPU memory size is less than 256, this will prevent the camera from running properly"
+                )
+                logger.error(
+                    "Please edit the file /boot/config.txt to change the gpu_mem value to at least 256"
+                )
+                logger.error(
+                    "or use raspi-config to change the memory split, in menu 7 Advanced Options, A3 Memory Split"
+                )
+                sys.exit(1)
 
     # Let's make sure the used base path exists
     img_path = "/home/pi/PlanktonScope/img"
@@ -101,8 +103,7 @@ if __name__ == "__main__":
         # create the path!
         os.makedirs(export_path)
 
-    with open("/sys/firmware/devicetree/base/serial-number", "r") as config_file:
-        logger.info(f"This PlanktoScope unique ID is {config_file.readline()}")
+    logger.info(f"This PlanktoScope unique ID is {planktoscope.uuidName.getSerial()}")
 
     # Prepare the event for a gracefull shutdown
     shutdown_event = multiprocessing.Event()
diff --git a/scripts/planktoscope/imager.py b/scripts/planktoscope/imager.py
index c692c85..c1dd630 100644
--- a/scripts/planktoscope/imager.py
+++ b/scripts/planktoscope/imager.py
@@ -280,7 +280,6 @@ class ImagerProcess(multiprocessing.Process):
                 logger.error("We can't update the configuration while we are imaging.")
                 # Publish the status "Interrupted" to via MQTT to Node-RED
                 self.imager_client.client.publish("status/imager", '{"status":"Busy"}')
-            pass
 
         elif action == "settings":
             if self.__imager.state.name is "stop":
@@ -327,7 +326,6 @@ class ImagerProcess(multiprocessing.Process):
                 )
                 # Publish the status "Interrupted" to via MQTT to Node-RED
                 self.imager_client.client.publish("status/imager", '{"status":"Busy"}')
-            pass
 
         elif action != "":
             logger.warning(
@@ -429,7 +427,6 @@ class ImagerProcess(multiprocessing.Process):
                 self.__imager.change(planktoscope.imager_state_machine.Stop)
                 # Set the LEDs as Green
                 planktoscope.light.setRGB(0, 255, 255)
-                return
             else:
                 # We have not reached the final stage, let's keep imaging
                 # Set the LEDs as Blue
@@ -459,12 +456,11 @@ class ImagerProcess(multiprocessing.Process):
 
                 # Change state towards Waiting for pump
                 self.__imager.change(planktoscope.imager_state_machine.Waiting)
-                return
-
-        elif self.__imager.state.name is "waiting":
             return
 
-        elif self.__imager.state.name is "stop":
+        elif (
+            self.__imager.state.name is "waiting" or self.__imager.state.name is "stop"
+        ):
             return
 
     ################################################################################
diff --git a/scripts/planktoscope/light.py b/scripts/planktoscope/light.py
index fe18db1..d4852e0 100644
--- a/scripts/planktoscope/light.py
+++ b/scripts/planktoscope/light.py
@@ -84,7 +84,7 @@ def light(state):
 
     if state == "on":
         RPi.GPIO.output(21, RPi.GPIO.HIGH)
-    if state == "off":
+    elif state == "off":
         RPi.GPIO.output(21, RPi.GPIO.LOW)
 
 
diff --git a/scripts/planktoscope/segmenter.py b/scripts/planktoscope/segmenter.py
index d3f0607..736dede 100644
--- a/scripts/planktoscope/segmenter.py
+++ b/scripts/planktoscope/segmenter.py
@@ -341,7 +341,6 @@ class SegmenterProcess(multiprocessing.Process):
             self.segmenter_client.client.publish(
                 "status/segmenter", '{"status":"Busy"}'
             )
-            pass
 
         elif action != "":
             logger.warning(
diff --git a/scripts/planktoscope/stepper.py b/scripts/planktoscope/stepper.py
index 7297741..841cc13 100644
--- a/scripts/planktoscope/stepper.py
+++ b/scripts/planktoscope/stepper.py
@@ -188,7 +188,7 @@ class StepperProcess(multiprocessing.Process):
             logger.info(
                 "The hardware configuration file doesn't exists, using defaults"
             )
-            configuration = dict()
+            configuration = {}
 
         reverse = False
 
@@ -371,7 +371,7 @@ class StepperProcess(multiprocessing.Process):
         )
 
         # Validation of inputs
-        if direction != "UP" and direction != "DOWN":
+        if direction not in ["UP", "DOWN"]:
             logger.error("The direction command is not recognised")
             logger.error("It should be either UP or DOWN")
             return
@@ -431,7 +431,7 @@ class StepperProcess(multiprocessing.Process):
         logger.info(f"The pump will move {direction} for {volume}mL at {speed}mL/min")
 
         # Validation of inputs
-        if direction != "FORWARD" and direction != "BACKWARD":
+        if direction not in ["FORWARD", "BACKWARD"]:
             logger.error("The direction command is not recognised")
             logger.error("It should be either FORWARD or BACKWARD")
             return