diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 000000000..5c4762f30
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,37 @@
+name: SonarCloud
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  build:
+    name: Build and analyze
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: 'zulu' # Alternative distribution options are available.
+      - name: Cache SonarCloud packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.sonar/cache
+          key: ${{ runner.os }}-sonar
+          restore-keys: ${{ runner.os }}-sonar
+      - name: Cache Maven packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Build and analyze
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        run: mvn -B verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar -Dsonar.projectKey=szfp98_base
diff --git a/pom.xml b/pom.xml
index 2be9fb5f5..2fc82dd58 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,6 +7,8 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<sonar.organization>szfp98</sonar.organization>
+  		<sonar.host.url>https://sonarcloud.io</sonar.host.url>
 	</properties>
 
     <packaging>pom</packaging>
diff --git a/train-controller/src/main/java/hu/bme/mit/train/controller/TrainControllerImpl.java b/train-controller/src/main/java/hu/bme/mit/train/controller/TrainControllerImpl.java
index 06649d278..f55d75057 100644
--- a/train-controller/src/main/java/hu/bme/mit/train/controller/TrainControllerImpl.java
+++ b/train-controller/src/main/java/hu/bme/mit/train/controller/TrainControllerImpl.java
@@ -43,7 +43,8 @@ private void enforceSpeedLimit() {
 
 	@Override
 	public void setJoystickPosition(int joystickPosition) {
-		this.step = joystickPosition;		
+		this.step = joystickPosition;
+		followSpeed();			
 	}
 
 }
diff --git a/train-interfaces/src/main/java/hu/bme/mit/train/interfaces/TrainUser.java b/train-interfaces/src/main/java/hu/bme/mit/train/interfaces/TrainUser.java
index 046f6fe80..34fe24f4c 100644
--- a/train-interfaces/src/main/java/hu/bme/mit/train/interfaces/TrainUser.java
+++ b/train-interfaces/src/main/java/hu/bme/mit/train/interfaces/TrainUser.java
@@ -2,10 +2,16 @@
 
 public interface TrainUser {
 
+	boolean alarmState = false;
+
 	int getJoystickPosition();
 
 	boolean getAlarmFlag();
 
 	void overrideJoystickPosition(int joystickPosition);
 
+	public boolean getAlarmState();
+
+	public void setAlarmState(boolean alarmState);
+
 }
diff --git a/train-sensor/src/main/java/hu/bme/mit/train/sensor/TrainSensorImpl.java b/train-sensor/src/main/java/hu/bme/mit/train/sensor/TrainSensorImpl.java
index 4a640d1dd..a6c7a8f1d 100644
--- a/train-sensor/src/main/java/hu/bme/mit/train/sensor/TrainSensorImpl.java
+++ b/train-sensor/src/main/java/hu/bme/mit/train/sensor/TrainSensorImpl.java
@@ -24,6 +24,10 @@ public int getSpeedLimit() {
 	public void overrideSpeedLimit(int speedLimit) {
 		this.speedLimit = speedLimit;
 		controller.setSpeedLimit(speedLimit);
+
+		if(speedLimit < 0 || speedLimit > 500 || speedLimit < controller.getReferenceSpeed() / 2) {
+			user.setAlarmState(true);
+		}
 	}
 
 }
diff --git a/train-sensor/src/test/java/hu/bme/mit/train/sensor/TrainSensorTest.java b/train-sensor/src/test/java/hu/bme/mit/train/sensor/TrainSensorTest.java
index ae5dee21b..56b55b701 100644
--- a/train-sensor/src/test/java/hu/bme/mit/train/sensor/TrainSensorTest.java
+++ b/train-sensor/src/test/java/hu/bme/mit/train/sensor/TrainSensorTest.java
@@ -1,19 +1,48 @@
 package hu.bme.mit.train.sensor;
 
+import hu.bme.mit.train.interfaces.TrainController;
+import hu.bme.mit.train.sensor.TrainSensorImpl;
+import hu.bme.mit.train.interfaces.TrainUser;
+
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 import static org.mockito.Mockito.*;
 
-public class TrainSensorTest {
+    public class TrainSensorTest {
+
+    TrainController mockTC;
+    TrainUser mockTU;
+    TrainSensorImpl trainSensor;
 
     @Before
     public void before() {
-        // TODO Add initializations
+        mockTC = mock(TrainController.class);
+        mockTU = mock(TrainUser.class);
+        trainSensor = new TrainSensorImpl(mockTC, mockTU);
+    }
+
+    @Test
+    public void setAlarmState_TrainUser_Min() {
+        trainSensor.overrideSpeedLimit(-1);
+        verify(mockTU, times(1)).setAlarmState(true);
+    }
+
+    @Test
+    public void setAlarmState_TrainUser_Max() {
+        trainSensor.overrideSpeedLimit(501);
+        verify(mockTU, times(1)).setAlarmState(true);
+    }
+
+    @Test
+    public void setAlarmState_TrainUser_RelativeLimit() {
+        trainSensor.overrideSpeedLimit(3);
+        verify(mockTU, times(1)).setAlarmState(true);
     }
 
     @Test
-    public void ThisIsAnExampleTestStub() {
-        // TODO Delete this and add test cases based on the issues
+    public void setAlarmState_TrainUser_Between() {
+        trainSensor.overrideSpeedLimit(300);
+        verify(mockTU, times(0)).setAlarmState(false);
     }
 }
diff --git a/train-user/src/main/java/hu/bme/mit/train/user/TrainUserImpl.java b/train-user/src/main/java/hu/bme/mit/train/user/TrainUserImpl.java
index 93d3b2e59..a3d993ca3 100644
--- a/train-user/src/main/java/hu/bme/mit/train/user/TrainUserImpl.java
+++ b/train-user/src/main/java/hu/bme/mit/train/user/TrainUserImpl.java
@@ -26,6 +26,19 @@ public int getJoystickPosition() {
 	public void overrideJoystickPosition(int joystickPosition) {
 		this.joystickPosition = joystickPosition;
 		controller.setJoystickPosition(joystickPosition);
+		
+		controller.followSpeed();
 	}
 
+	@Override
+	public boolean getAlarmState() {
+		return alarmState;
+	}
+
+	public void setAlarmState(boolean alarmState) {
+		alarmState = alarmState;
+	}
+
+
+
 }