diff --git a/src/components/rfid_pn532.py b/src/components/rfid_pn532.py
index 3a1e4a0..fde6449 100644
--- a/src/components/rfid_pn532.py
+++ b/src/components/rfid_pn532.py
@@ -45,36 +45,37 @@ class RFID_PN532(Component):
 
     @pyqtSlot()
     def _get(self):
-        if self.mutex.tryLock():
-            try:
-                if not self.connected:
-                    self.open_device()
-                else:
-                    target = self.clf.sense(RemoteTarget('106A'), RemoteTarget('106B'), RemoteTarget('212F'))
-                    if target is not None:
-                        tag = nfc.tag.activate(self.clf, target)
-                        if tag is not None:
-                            self.log.debug("tag present")
-                            if tag.ndef is not None:
-                                tag_content=tag.ndef.records[0].text
-                                if tag_content!=self.current_data:
-                                    self.log.info(f"new tag detected:{tag_content}")
-                                    self.current_data=tag_content
-                                    self.new_id_signal.emit(self.current_data)
-                            else:
-                                self.log.error("tag is not NDEF")
+        if not self.simulate:
+            if self.mutex.tryLock():
+                try:
+                    if not self.connected:
+                        self.open_device()
                     else:
-                        if self.current_data:
-                            self.log.info(f"tag removed:{self.current_data}")
-                            self.current_data = None
-                            self.new_id_signal.emit(None)
-                        self.log.debug("no target present")
+                        target = self.clf.sense(RemoteTarget('106A'), RemoteTarget('106B'), RemoteTarget('212F'))
+                        if target is not None:
+                            tag = nfc.tag.activate(self.clf, target)
+                            if tag is not None:
+                                self.log.debug("tag present")
+                                if tag.ndef is not None:
+                                    tag_content=tag.ndef.records[0].text
+                                    if tag_content!=self.current_data:
+                                        self.log.info(f"new tag detected:{tag_content}")
+                                        self.current_data=tag_content
+                                        self.new_id_signal.emit(self.current_data)
+                                else:
+                                    self.log.error("tag is not NDEF")
+                        else:
+                            if self.current_data:
+                                self.log.info(f"tag removed:{self.current_data}")
+                                self.current_data = None
+                                self.new_id_signal.emit(None)
+                            self.log.debug("no target present")
 
-            except Exception as e:
-                self.log.info(f"{e}")
-                self.connected = False
-            finally:
-                self.mutex.unlock()
+                except Exception as e:
+                    self.log.info(f"{e}")
+                    self.connected = False
+                finally:
+                    self.mutex.unlock()
 
     def write_tag(self,data):
         self.data_to_write=copy.deepcopy(data)
diff --git a/src/components/usb_586x.py b/src/components/usb_586x.py
index 9632f2f..b87b98d 100644
--- a/src/components/usb_586x.py
+++ b/src/components/usb_586x.py
@@ -176,6 +176,7 @@ class USB_586x(Component):
             if is_win or self.simulate:
                 if self.simulate:
                     read=[1,0,0,0,0,0,0,0],[0,0,0,0,0,0,0,0]
+                    break
                 else:
                     if self.io_ok:
                         ret = self.di_read(0, self.in_size)
diff --git a/src/lib/helpers/single_process.py b/src/lib/helpers/single_process.py
new file mode 100644
index 0000000..f085123
--- /dev/null
+++ b/src/lib/helpers/single_process.py
@@ -0,0 +1,25 @@
+from PyQt5.QtCore import QSharedMemory
+
+
+class SingleProcess:
+    def __init__(self, key='memory_condition_key'):
+        self._shm = QSharedMemory(key)
+        if not self._shm.attach():
+            if not self._shm.create(1):
+                raise RuntimeError('error creating shared memory: %s' %
+                                   self._shm.errorString())
+        self.condition = False
+
+    def __enter__(self):
+        self._shm.lock()
+        if self._shm.data()[0] == b'\x00':
+            self.condition = True
+            self._shm.data()[0] = b'\x01'
+        self._shm.unlock()
+        return self.condition
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.condition:
+            self._shm.lock()
+            self._shm.data()[0] = b'\x00'
+            self._shm.unlock()
diff --git a/src/main.py b/src/main.py
index b618aac..fc7f700 100644
--- a/src/main.py
+++ b/src/main.py
@@ -11,6 +11,7 @@ import weakref
 from datetime import datetime
 from pathlib import Path
 
+from lib.helpers.single_process import SingleProcess
 
 if platform.system().lower() == "windows":
     sys.path.append(f"{os.getcwd()}\src\components")
@@ -254,17 +255,24 @@ try:
 
     if __name__ == "__main__":
         app = QApplication(sys.argv)
-        main = Main()
-        if "--no-gui" not in sys.argv:
-            app.exec()
-        if "--interact" in sys.argv:
-            import code
-            import readline
 
-            variables = globals().copy()
-            variables.update(locals())
-            shell = code.InteractiveConsole(variables)
-            shell.interact()
+        with SingleProcess() as single_process_lock:
+            if not single_process_lock:
+                logging.error(f"Program already opened, exiting...")
+                QMessageBox.critical(None, "ERRORE", "IL PROGRAMMA E' GIA' IN ESECUZIONE")
+                exit(0)
+
+            main = Main()
+            if "--no-gui" not in sys.argv:
+                app.exec()
+            if "--interact" in sys.argv:
+                import code
+                import readline
+
+                variables = globals().copy()
+                variables.update(locals())
+                shell = code.InteractiveConsole(variables)
+                shell.interact()
 except Exception:
     logging.exception(traceback.format_exc())
     # extype, value, tb = sys.exc_info()
diff --git a/src/ui/barcode_recipe_selection/barcode_recipe_selection.ui b/src/ui/barcode_recipe_selection/barcode_recipe_selection.ui
index 2805d48..b45d4a3 100644
--- a/src/ui/barcode_recipe_selection/barcode_recipe_selection.ui
+++ b/src/ui/barcode_recipe_selection/barcode_recipe_selection.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>1445</width>
-    <height>793</height>
+    <width>1273</width>
+    <height>698</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -27,30 +27,6 @@
     <number>0</number>
    </property>
    <item row="2" column="0" alignment="Qt::AlignHCenter">
-    <widget class="QLabel" name="state_l">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Maximum" vsizetype="Maximum">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-     <property name="minimumSize">
-      <size>
-       <width>200</width>
-       <height>200</height>
-      </size>
-     </property>
-     <property name="font">
-      <font>
-       <pointsize>12</pointsize>
-      </font>
-     </property>
-     <property name="text">
-      <string/>
-     </property>
-    </widget>
-   </item>
-   <item row="3" column="0" alignment="Qt::AlignHCenter">
     <widget class="QPlainTextEdit" name="barcode_input_l">
      <property name="minimumSize">
       <size>
@@ -70,13 +46,11 @@
       </font>
      </property>
      <property name="plainText">
-      <string>123
-456
-abc</string>
+      <string/>
      </property>
     </widget>
    </item>
-   <item row="4" column="0" alignment="Qt::AlignHCenter">
+   <item row="3" column="0" alignment="Qt::AlignHCenter">
     <widget class="QPushButton" name="recipe_selection_b">
      <property name="font">
       <font>
diff --git a/src/ui/test_assembly/test_assembly.ui b/src/ui/test_assembly/test_assembly.ui
index 20f4c1e..ad12a3e 100755
--- a/src/ui/test_assembly/test_assembly.ui
+++ b/src/ui/test_assembly/test_assembly.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>94</width>
-    <height>130</height>
+    <width>627</width>
+    <height>332</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -26,7 +26,7 @@
    <property name="bottomMargin">
     <number>0</number>
    </property>
-   <item row="0" column="0">
+   <item row="0" column="0" alignment="Qt::AlignHCenter">
     <widget class="QLabel" name="img_l">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Minimum" vsizetype="Minimum">
@@ -34,11 +34,17 @@
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
+     <property name="minimumSize">
+      <size>
+       <width>100</width>
+       <height>100</height>
+      </size>
+     </property>
      <property name="text">
       <string/>
      </property>
      <property name="scaledContents">
-      <bool>false</bool>
+      <bool>true</bool>
      </property>
      <property name="alignment">
       <set>Qt::AlignCenter</set>