diff --git a/.gitignore b/.gitignore
index 7ef2324..96f0431 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,10 +4,10 @@
 /.idea/libraries
 /.idea/modules.xml
 /.idea/workspace.xml
+/.idea/caches
 .DS_Store
 /build
 /captures
 .externalNativeBuild
 .idea/assetWizardSettings.xml
 /documentation/.~lock.doku.ods#
-.idea/caches/build_file_checksums.ser
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index bdc2025..ab530b5 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -52,48 +52,48 @@
         android:layout_width="62dp"
         android:layout_height="21dp"
         app:srcCompat="@drawable/zyl1"
-        tools:layout_editor_absoluteX="190dp"
-        tools:layout_editor_absoluteY="172dp" />
+        tools:layout_editor_absoluteX="91dp"
+        tools:layout_editor_absoluteY="118dp" />
 
     <ImageView
         android:id="@+id/b1_icon"
         android:layout_width="62dp"
         android:layout_height="21dp"
         app:srcCompat="@drawable/zyl1"
-        tools:layout_editor_absoluteX="242dp"
-        tools:layout_editor_absoluteY="95dp" />
+        tools:layout_editor_absoluteX="91dp"
+        tools:layout_editor_absoluteY="54dp" />
 
     <ImageView
         android:id="@+id/sp1_icon"
         android:layout_width="62dp"
         android:layout_height="21dp"
         app:srcCompat="@drawable/zyl1"
-        tools:layout_editor_absoluteX="86dp"
-        tools:layout_editor_absoluteY="93dp" />
+        tools:layout_editor_absoluteX="9dp"
+        tools:layout_editor_absoluteY="54dp" />
 
     <ImageView
         android:id="@+id/pu1_icon"
         android:layout_width="62dp"
         android:layout_height="21dp"
         app:srcCompat="@drawable/zyl1"
-        tools:layout_editor_absoluteX="76dp"
-        tools:layout_editor_absoluteY="172dp" />
+        tools:layout_editor_absoluteX="9dp"
+        tools:layout_editor_absoluteY="119dp" />
 
     <ImageView
         android:id="@+id/ls5_icon"
         android:layout_width="26dp"
         android:layout_height="38dp"
         app:srcCompat="@drawable/ls1"
-        tools:layout_editor_absoluteX="179dp"
-        tools:layout_editor_absoluteY="77dp" />
+        tools:layout_editor_absoluteX="205dp"
+        tools:layout_editor_absoluteY="54dp" />
 
     <ImageView
         android:id="@+id/ind1_icon"
         android:layout_width="26dp"
         android:layout_height="38dp"
         app:srcCompat="@drawable/ls1"
-        tools:layout_editor_absoluteX="29dp"
-        tools:layout_editor_absoluteY="76dp" />
+        tools:layout_editor_absoluteX="262dp"
+        tools:layout_editor_absoluteY="54dp" />
 
     <ImageView
         android:id="@+id/h2_icon"
@@ -114,7 +114,23 @@
         tools:layout_editor_absoluteY="239dp" />
 
     <ImageView
-        android:id="@+id/pu1_status_light_off_mainview "
+        android:id="@+id/ls4_icon"
+        android:layout_width="26dp"
+        android:layout_height="38dp"
+        app:srcCompat="@drawable/ls1"
+        tools:layout_editor_absoluteX="262dp"
+        tools:layout_editor_absoluteY="139dp" />
+
+    <ImageView
+        android:id="@+id/ls1_icon"
+        android:layout_width="26dp"
+        android:layout_height="38dp"
+        app:srcCompat="@drawable/ls1"
+        tools:layout_editor_absoluteX="205dp"
+        tools:layout_editor_absoluteY="139dp" />
+
+    <ImageView
+        android:id="@+id/pu1_status_light_off_mainview"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginBottom="8dp"
@@ -127,7 +143,7 @@
         app:srcCompat="@android:drawable/presence_invisible" />
 
     <ImageView
-        android:id="@+id/pu1_status_light_on_mainview "
+        android:id="@+id/pu1_status_light_on_mainview"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginBottom="8dp"
@@ -338,7 +354,6 @@
         app:layout_constraintStart_toStartOf="@+id/m1_icon"
         app:srcCompat="@android:drawable/presence_online" />
 
-
     <ImageView
         android:id="@+id/m2_status_light_off_mainview"
         android:layout_width="wrap_content"
@@ -378,7 +393,6 @@
         app:layout_constraintTop_toTopOf="@+id/m1_icon"
         app:layout_constraintVertical_bias="1.0" />
 
-
     <TextView
         android:id="@+id/m2_textview_mainview"
         android:layout_width="wrap_content"
@@ -481,4 +495,74 @@
         app:layout_constraintEnd_toEndOf="@+id/sp1_icon"
         app:layout_constraintStart_toStartOf="@+id/sp1_icon"
         app:layout_constraintTop_toBottomOf="@+id/sp1_icon" />
+
+    <TextView
+        android:id="@+id/ls4_textview_mainview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:text="LS4"
+        app:layout_constraintEnd_toEndOf="@+id/ls4_icon"
+        app:layout_constraintStart_toStartOf="@+id/ls4_icon"
+        app:layout_constraintTop_toBottomOf="@+id/ls4_icon" />
+
+    <ImageView
+        android:id="@+id/ls4_status_light_off_mainview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        app:layout_constraintBottom_toTopOf="@+id/ls4_icon"
+        app:layout_constraintEnd_toEndOf="@+id/ls4_icon"
+        app:layout_constraintStart_toStartOf="@+id/ls4_icon"
+        app:srcCompat="@android:drawable/presence_invisible" />
+
+    <ImageView
+        android:id="@+id/ls4_status_light_on_mainview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        app:layout_constraintBottom_toTopOf="@+id/ls4_icon"
+        app:layout_constraintEnd_toEndOf="@+id/ls4_icon"
+        app:layout_constraintStart_toStartOf="@+id/ls4_icon"
+        app:srcCompat="@android:drawable/presence_online" />
+
+    <TextView
+        android:id="@+id/ls1_textview_mainview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        android:text="LS1"
+        app:layout_constraintEnd_toEndOf="@+id/ls1_icon"
+        app:layout_constraintStart_toStartOf="@+id/ls1_icon"
+        app:layout_constraintTop_toBottomOf="@+id/ls1_icon" />
+
+    <ImageView
+        android:id="@+id/ls1_status_light_off_mainview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        app:layout_constraintBottom_toTopOf="@+id/ls1_icon"
+        app:layout_constraintEnd_toEndOf="@+id/ls1_icon"
+        app:layout_constraintStart_toStartOf="@+id/ls1_icon"
+        app:srcCompat="@android:drawable/presence_invisible" />
+
+    <ImageView
+        android:id="@+id/ls1_status_light_on_mainview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        app:layout_constraintBottom_toTopOf="@+id/ls1_icon"
+        app:layout_constraintEnd_toEndOf="@+id/ls1_icon"
+        app:layout_constraintStart_toStartOf="@+id/ls1_icon"
+        app:srcCompat="@android:drawable/presence_online" />
 </android.support.constraint.ConstraintLayout>
\ No newline at end of file
diff --git a/documentation/doku.ods b/documentation/doku.ods
index 396e80d..b298697 100644
Binary files a/documentation/doku.ods and b/documentation/doku.ods differ