diff --git a/gui/main.py b/gui/main.py
index 55981f4..f98f4cb 100644
--- a/gui/main.py
+++ b/gui/main.py
@@ -165,6 +165,12 @@ class PHControllerGUI(QMainWindow):
         self.total_volume = 0.0  # Total volume pumped in ml
         self.last_flow_rate = 0.0  # Last known flow rate
         
+        # Auto dosing
+        self.auto_dosing = False
+        self.target_volume = 0.0
+        self.auto_dose_timer = QTimer()
+        self.auto_dose_timer.timeout.connect(self.check_auto_dose_progress)
+        
         # Enable/disable controls based on connection
         self.set_controls_enabled(False)
     
@@ -227,6 +233,10 @@ class PHControllerGUI(QMainWindow):
         # Stop flow rate polling
         self.flow_rate_timer.stop()
         
+        # Stop auto dose timer
+        self.auto_dose_timer.stop()
+        self.auto_dosing = False
+        
         self.connect_btn.setText("Verbinden")
         self.status_bar.showMessage("Getrennt")
         self.set_controls_enabled(False)
@@ -237,6 +247,8 @@ class PHControllerGUI(QMainWindow):
         self.pump_is_running = False
         self.total_volume = 0.0
         self.last_flow_rate = 0.0
+        self.auto_dosing = False
+        self.auto_dose_timer.stop()
     
     def set_controls_enabled(self, enabled):
         self.pump_on_btn.setEnabled(enabled)
@@ -296,8 +308,8 @@ class PHControllerGUI(QMainWindow):
             self.total_volume_label.setVisible(True)
             
             # Check if volume should be reset or continue accumulating
-            if self.reset_volume_checkbox.isChecked():
-                # Reset volume counter
+            if self.reset_volume_checkbox.isChecked() or self.auto_dosing:
+                # Reset volume counter (always reset for auto dosing)
                 self.total_volume = 0.0
                 self.total_volume_label.setText("Gesamt: 0.0 ml")
             else:
@@ -312,6 +324,15 @@ class PHControllerGUI(QMainWindow):
             self.flow_rate_label.setVisible(False)
             # Keep total_volume_label visible to show final amount
             self.flow_rate_timer.stop()
+            
+            # Stop auto dosing if it was running
+            if self.auto_dosing:
+                self.auto_dosing = False
+                self.auto_dose_timer.stop()
+                self.auto_dose_btn.setText("Automatisch dosieren")
+                self.auto_dose_btn.setEnabled(True)
+                QMessageBox.information(self, "Automatische Dosierung", 
+                                      f"Dosierung abgeschlossen!\nGepumpte Menge: {self.total_volume:.2f} ml")
     
     def send_tube_command(self, index):
         # Only send command if not updating from Arduino response
@@ -336,12 +357,66 @@ class PHControllerGUI(QMainWindow):
         self.status_bar.showMessage("Debug-Informationen angefragt...")
     
     def start_auto_dose(self):
+        if self.auto_dosing:
+            # Stop auto dosing
+            self.auto_dosing = False
+            self.auto_dose_timer.stop()
+            self.send_pump_command(0)  # Turn off pump
+            self.auto_dose_btn.setText("Automatisch dosieren")
+            return
+            
         volume = self.volume_spin.value()
-        # Calculate pump run time based on tube size and volume
-        # This would need to be implemented based on your specific setup
-        QMessageBox.information(self, "Automatische Dosierung", 
-                              f"Es werden {volume} ml dosiert. Bitte warten...")
-        # Implementation would need to send appropriate commands to Arduino
+        self.target_volume = volume
+        self.auto_dosing = True
+        
+        # Update button text and disable manual pump controls during auto dosing
+        self.auto_dose_btn.setText("Stop Dosierung")
+        self.pump_on_btn.setEnabled(False)
+        self.pump_off_btn.setEnabled(False)
+        
+        # Reset volume counter for accurate measurement
+        self.total_volume = 0.0
+        
+        # Start pumping
+        self.send_pump_command(1)
+        
+        # Start monitoring timer (check every 0.5 seconds for better precision)
+        self.auto_dose_timer.start(500)
+        
+        self.status_bar.showMessage(f"Automatische Dosierung läuft... Ziel: {volume} ml")
+    
+    def check_auto_dose_progress(self):
+        """Check if target volume has been reached during auto dosing"""
+        if not self.auto_dosing:
+            return
+            
+        # Check if we've reached or exceeded the target volume
+        if self.total_volume >= self.target_volume:
+            # Stop dosing
+            self.auto_dosing = False
+            self.auto_dose_timer.stop()
+            self.send_pump_command(0)  # Turn off pump
+            
+            # Re-enable manual controls
+            self.pump_on_btn.setEnabled(True)
+            self.pump_off_btn.setEnabled(True)
+            self.auto_dose_btn.setText("Automatisch dosieren")
+            
+            # Show completion message
+            actual_volume = self.total_volume
+            difference = actual_volume - self.target_volume
+            
+            message = f"Dosierung abgeschlossen!\n"
+            message += f"Zielvolumen: {self.target_volume:.2f} ml\n"
+            message += f"Tatsächliches Volumen: {actual_volume:.2f} ml\n"
+            message += f"Abweichung: {difference:+.2f} ml"
+            
+            QMessageBox.information(self, "Automatische Dosierung", message)
+            self.status_bar.showMessage(f"Dosierung abgeschlossen: {actual_volume:.2f} ml von {self.target_volume:.2f} ml")
+        else:
+            # Update progress in status bar
+            progress = (self.total_volume / self.target_volume) * 100
+            self.status_bar.showMessage(f"Dosierung: {self.total_volume:.2f}/{self.target_volume:.2f} ml ({progress:.1f}%)")
     
     def read_serial_data(self):
         if not self.serial_connection or not self.serial_connection.is_open:
@@ -409,6 +484,7 @@ class PHControllerGUI(QMainWindow):
         self.ph_request_timer.stop()
         self.tube_request_timer.stop()
         self.flow_rate_timer.stop()
+        self.auto_dose_timer.stop()
         self.close_connection()
         event.accept()