diff --git a/app/src/main/java/com/example/co2sense_app/BLEDevice.java b/app/src/main/java/com/example/co2sense_app/BLEDevice.java
index 7b0ec82..969c9a6 100644
--- a/app/src/main/java/com/example/co2sense_app/BLEDevice.java
+++ b/app/src/main/java/com/example/co2sense_app/BLEDevice.java
@@ -29,7 +29,10 @@ import androidx.annotation.RequiresApi;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
 
+import java.util.EnumMap;
+import java.util.HashMap;
 import java.util.LinkedList;
+import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.PriorityQueue;
 import java.util.Queue;
@@ -57,6 +60,18 @@ public abstract class BLEDevice {
 
     LinkedList<Runnable> commandQueue = new LinkedList<>();
     boolean commandLock=false;
+    private boolean newStatusAvailable;
+
+    public enum connectionState{ERROR, STARTING_BLUETOOTH, SCANNING, CONNECTING, CONNECTED, DISCOVERING_SERVICES, DISCOVERED_CHAR, REGISTERING_NOTIFS, READING_DATA, IDLE, DISCONNECTED};
+    private EnumMap<connectionState, String> stateText = new EnumMap<>(connectionState.class);
+
+    public connectionState currentState = connectionState.ERROR;
+
+    public interface onStatusChangedCallback{
+        void onStatusChanged(connectionState newState);
+    }
+
+    private onStatusChangedCallback statusChangedCallback;
 
     @RequiresApi(api = Build.VERSION_CODES.S)
     BLEDevice(Activity activity) {
@@ -68,11 +83,24 @@ public abstract class BLEDevice {
         if (bluetoothManager == null)
             throw new NoSuchElementException("No Bluetooth manager found");
         bluetoothAdapter = bluetoothManager.getAdapter();
+
+        stateText.put(connectionState.ERROR, activity.getString(R.string.status_text_error));
+        stateText.put(connectionState.STARTING_BLUETOOTH, activity.getString(R.string.status_text_starting_bluetooth));
+        stateText.put(connectionState.SCANNING, activity.getString(R.string.status_text_scanning));
+        stateText.put(connectionState.CONNECTING, activity.getString(R.string.status_text_connecting));
+        stateText.put(connectionState.CONNECTED, activity.getString(R.string.status_text_connected));
+        stateText.put(connectionState.DISCOVERING_SERVICES, activity.getString(R.string.status_text_discovering_services));
+        stateText.put(connectionState.DISCOVERED_CHAR, activity.getString(R.string.status_text_discovered_char));
+        stateText.put(connectionState.REGISTERING_NOTIFS, activity.getString(R.string.status_text_reg_notif));
+        stateText.put(connectionState.READING_DATA, activity.getString(R.string.status_text_reading_data));
+        stateText.put(connectionState.DISCONNECTED, activity.getString(R.string.status_text_disconnected));
+        stateText.put(connectionState.IDLE, activity.getString(R.string.status_text_idle));
     }
 
     @RequiresApi(api = Build.VERSION_CODES.S)
     public void startBT() {
         Log.d("bt", "startBT");
+        setStatus(connectionState.STARTING_BLUETOOTH);
         if (bluetoothAdapter == null)
             throw new NoSuchElementException("No Bluetooth adapter found");
 
@@ -96,6 +124,7 @@ public abstract class BLEDevice {
             Log.d("bt", "no perm");
             return;
         }*/
+        setStatus(connectionState.CONNECTING);
         Log.d("bt", device.toString());
         BLEDevice mainClass = this;
         bluetoothGatt = device.connectGatt(activity, false, new BluetoothGattCallback() {
@@ -103,9 +132,12 @@ public abstract class BLEDevice {
             public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
                 if (newState == BluetoothProfile.STATE_CONNECTED) {
                     Log.d("bt", "connected");
+                    setStatus(connectionState.CONNECTED);
                     bluetoothGatt.discoverServices();
+                    setStatus(connectionState.DISCOVERING_SERVICES);
                 } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                     Log.d("bt", "disconnected");
+                    setStatus(connectionState.DISCONNECTED);
                     connect();
                 }
             }
@@ -114,9 +146,11 @@ public abstract class BLEDevice {
             public void onServicesDiscovered(BluetoothGatt gatt, int status) {
                 if (status == BluetoothGatt.GATT_SUCCESS) {
                     Log.d("bt", "onServicesDiscovered: finished");
+                    setStatus(connectionState.DISCOVERED_CHAR);
                     mainClass.onServicesDiscovered();
                 } else {
                     Log.w("bt", "onServicesDiscovered received: " + status);
+                    setStatus(connectionState.ERROR);
                 }
             }
 
@@ -200,9 +234,11 @@ public abstract class BLEDevice {
 
     protected void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status){
         eventCallback.onDescriptorRead(gatt, descriptor, status);
+        setStatus(connectionState.IDLE);
     }
     protected void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status){
         eventCallback.onCharacteristicRead(gatt, characteristic, status);
+        setStatus(connectionState.IDLE);
     }
 
     @RequiresApi(api = Build.VERSION_CODES.S)
@@ -230,6 +266,7 @@ public abstract class BLEDevice {
         Log.d("BLE_device", "startScan: ");
         BluetoothLeScanner bluetoothLeScanner = bluetoothAdapter.getBluetoothLeScanner();
         bluetoothLeScanner.startScan(callback);
+        setStatus(connectionState.SCANNING);
     }
 
     @RequiresApi(api = Build.VERSION_CODES.S)
@@ -248,6 +285,7 @@ public abstract class BLEDevice {
             @Override
             public void run() {
                 bluetoothGatt.writeDescriptor(descr);
+                setStatus(connectionState.REGISTERING_NOTIFS);
             }
         });
         runNextCommand();
@@ -261,6 +299,7 @@ public abstract class BLEDevice {
             @Override
             public void run() {
                 bluetoothGatt.readCharacteristic(charact);
+                setStatus(connectionState.READING_DATA);
             }
         });
         runNextCommand();
@@ -271,6 +310,25 @@ public abstract class BLEDevice {
         if(commandQueue.size()==0) return;
         commandLock=true;
         Log.d("bt", "runNextCommand: ");
-        commandQueue.poll().run();
+        Runnable command = commandQueue.poll();
+        command.run();
+    }
+
+    void setStatus(connectionState newState){
+        currentState = newState;
+        activity.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                statusChangedCallback.onStatusChanged(newState);
+            }
+        });
+    }
+
+    void registerStatusCallback(onStatusChangedCallback callback){
+        statusChangedCallback = callback;
+    }
+
+    String getStatusText(connectionState state){
+        return stateText.get(state);
     }
 }
diff --git a/app/src/main/java/com/example/co2sense_app/MainActivity.java b/app/src/main/java/com/example/co2sense_app/MainActivity.java
index 11cbd34..ee168c7 100644
--- a/app/src/main/java/com/example/co2sense_app/MainActivity.java
+++ b/app/src/main/java/com/example/co2sense_app/MainActivity.java
@@ -17,6 +17,7 @@ import android.os.Bundle;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.widget.TextView;
 
 public class MainActivity extends AppCompatActivity {
     CO2Sensor sensor;
@@ -41,6 +42,14 @@ public class MainActivity extends AppCompatActivity {
 
         sensor = new CO2Sensor(this);
 
+        TextView statusText = findViewById(R.id.status);
+        sensor.registerStatusCallback(new BLEDevice.onStatusChangedCallback(){
+            @Override
+            public void onStatusChanged(BLEDevice.connectionState newState){
+                statusText.setText(sensor.getStatusText(newState));
+            }
+        });
+
         if(targetDeviceMAC != null) {
             sensor.setDeviceFromMAC(targetDeviceMAC);
             sensor.startConnectOnBTStart(true);
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index adf2eb1..53db44e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -5,4 +5,15 @@
     <string name="status_erreur">erreur</string>
     <string name="select_ble_device">select</string>
     <string name="main_shared_pref">com.example.co2sense_app.SHARED_PREF_MAIN</string>
+    <string name="status_text_error">Error</string>
+    <string name="status_text_starting_bluetooth">starting bluetooth</string>
+    <string name="status_text_scanning">scanning</string>
+    <string name="status_text_connecting">connecting</string>
+    <string name="status_text_connected">connected</string>
+    <string name="status_text_discovered_char">discovering characteristics</string>
+    <string name="status_text_reg_notif">registering notifs</string>
+    <string name="status_text_disconnected">disconnected</string>
+    <string name="status_text_reading_data">reading data</string>
+    <string name="status_text_idle">waiting</string>
+    <string name="status_text_discovering_services">discovering services</string>
 </resources>
\ No newline at end of file