diff --git a/device_worker.py b/device_worker.py
index ff7180e..d1368df 100644
--- a/device_worker.py
+++ b/device_worker.py
@@ -1,4 +1,7 @@
-import threading, queue, time, csv, os, statistics
+import os, sys, time, csv, statistics, threading, queue
+
+scriptDir = os.path.dirname(os.path.realpath(__file__))
+DEFAULT_OUTDIR = os.path.join(scriptDir, "logs")
 
 class DeviceWorker:
     """
@@ -8,10 +11,11 @@ class DeviceWorker:
     - 1 Hz Logging (eine CSV-Zeile pro Sekunde)
     Wichtig: kontrolliert NICHT die Session!
     """
-    def __init__(self, dev, outdir="./logs", filter_window_size=10, interval=0.1):
+    def __init__(self, dev, outdir=DEFAULT_OUTDIR, filter_window_size=10, interval=0.1):
         self.dev = dev
         self.serial = getattr(dev, "serial", "UNKNOWN")
         self.outdir = outdir
+        self._log_path = None
         self.filter_window_size = filter_window_size
         self.interval = interval
 
@@ -25,30 +29,27 @@ class DeviceWorker:
 
     # ---- API ----
     def start(self):
+        print(f"[{self.serial}] Worker.start()")
         if not self._reader_t.is_alive(): self._reader_t.start()
         if not self._writer_t.is_alive(): self._writer_t.start()
         self._cmdq.put(("start", None))
 
     def stop(self):
+        print(f"[{self.serial}] Worker.stop()")
         self._cmdq.put(("stop", None))
 
-    def shutdown(self):
-        self.stop()
-        self._stop_evt.set()
-
-    def set_mode(self, ch, mode):
-        key = {0: "A", 1: "B"}.get(ch, str(ch).upper())
-        self.dev.channels[key].mode = mode
-
-    # ---- Threads ----
     def _reader_loop(self):
+        print(f"[{self.serial}] Reader gestartet (interval={self.interval}, n={self.filter_window_size})")
         last_log = 0.0
         while not self._stop_evt.is_set():
-            # Kommandos
             try:
                 cmd, _ = self._cmdq.get_nowait()
-                if cmd == "start": self._running = True
-                elif cmd == "stop": self._running = False
+                if cmd == "start":
+                    self._running = True
+                    print(f"[{self.serial}] RUNNING")
+                elif cmd == "stop":
+                    self._running = False
+                    print(f"[{self.serial}] STOPPED")
             except queue.Empty:
                 pass
 
@@ -57,9 +58,12 @@ class DeviceWorker:
                 continue
 
             try:
-                # wie im Single-Logger: n Samples holen, mitteln
-                # WICHTIG: kleiner Timeout, damit der Thread nie "fest" hängt
-                samples = self.dev.read(self.filter_window_size, 50)  # timeout ~50 ms
+                # WÄHLE HIER DIE SIGNATUR, DIE DEIN SINGLE-LOGGER NUTZT:
+                # Beispiel A (deine Datei ließ 'read(n, 500, True)' vermuten):
+                samples = self.dev.read(self.filter_window_size, 500, True)
+                # Beispiel B (andere pysmu-Versionen):
+                # samples = self.dev.read(self.filter_window_size, -1)
+
                 if not samples:
                     time.sleep(self.interval)
                     continue
@@ -68,34 +72,38 @@ class DeviceWorker:
                 vB = statistics.mean(row[2] for row in samples)
 
                 now = time.time()
-                if now - last_log >= 1.0:  # 1 Hz ins File
-                    try:
-                        self._writer_q.put((now, vA, vB), timeout=0.2)
-                        last_log = now
-                    except queue.Full:
-                        pass
+                if now - last_log >= 1.0:
+                    self._writer_q.put((now, vA, vB))
+                    last_log = now
+
             except Exception as e:
                 print(f"[{self.serial}] Read-Fehler: {e}")
-                time.sleep(0.02)
+                time.sleep(0.05)
 
-            # Loop-Takt exakt wie beim Single-Logger
             time.sleep(max(0.05, self.interval))
 
     def _writer_loop(self):
-        os.makedirs(self.outdir, exist_ok=True)
-        fn = os.path.join(self.outdir, f"{time.strftime('%Y%m%d_%H%M%S')}_{self.serial}.csv")
         try:
-            with open(fn, "w", newline="") as f:
+            os.makedirs(self.outdir, exist_ok=True)
+        except Exception as e:
+            print(f"[{self.serial}] os.makedirs-Fehler für '{self.outdir}': {e}")
+            return
+
+        self._log_path = os.path.join(self.outdir, f"{time.strftime('%Y%m%d_%H%M%S')}_{self.serial}.csv")
+        print(f"[{self.serial}] Writer startet → {self._log_path}")
+
+        try:
+            with open(self._log_path, "w", newline="") as f:
                 w = csv.writer(f)
-                w.writerow(["timestamp", "A", "B"])
+                w.writerow(["timestamp", "A", "B"])  # Datei wird JETZT angelegt
                 while not (self._stop_evt.is_set() and self._writer_q.empty()):
                     try:
                         ts, vA, vB = self._writer_q.get(timeout=0.5)
                     except queue.Empty:
                         continue
                     w.writerow([ts, vA, vB])
-                    f.flush()  # bei 1 Hz ok
+                    f.flush()
         except Exception as e:
-            print(f"[{self.serial}] Writer-Fehler: {e}")
+            print(f"[{self.serial}] Writer-Fehler ({self._log_path}): {e}")
         finally:
-            print(f"[{self.serial}] Datei geschlossen: {fn}")
\ No newline at end of file
+            print(f"[{self.serial}] Writer beendet: {self._log_path}")
\ No newline at end of file
diff --git a/gui_main.py b/gui_main.py
index e91ef11..a0bb579 100644
--- a/gui_main.py
+++ b/gui_main.py
@@ -1,7 +1,10 @@
-import sys
+import sys, os
 from PyQt5.QtWidgets import QApplication, QWidget, QListWidget, QListWidgetItem, QVBoxLayout, QPushButton, QLabel, QHBoxLayout
 from multi_logger import MultiLogger
 
+scriptDir = os.path.dirname(os.path.realpath(__file__))
+DEFAULT_OUTDIR = os.path.join(scriptDir, "logs")
+
 class ListItemWidget(QWidget):
     def __init__(self, label, worker):
         super().__init__()
@@ -48,11 +51,9 @@ class MainWindow(QWidget):
 
 if __name__ == "__main__":
     # 1) Logger + Geräte
-    ml = MultiLogger(outdir="./logs", filter_window_size=10, interval=0.1)
+    ml = MultiLogger(outdir=DEFAULT_OUTDIR, filter_window_size=10, interval=0.1)
     print("Gefundene Geräte:", [w.serial for w in ml.workers])
     ml.set_default_modes()
-
-    # 2) Session EINMAL im Hauptthread starten (wie beim Single-Logger!)
     ml.start_session()
 
     # 3) GUI