diff --git a/pyrelacs/ui/mainwindow.py b/pyrelacs/ui/mainwindow.py
index 8f635b1..351c7a0 100644
--- a/pyrelacs/ui/mainwindow.py
+++ b/pyrelacs/ui/mainwindow.py
@@ -1,5 +1,7 @@
 import time
 from pathlib import Path as path
+from datetime import datetime
+from dataclasses import asdict
 
 from PyQt6.QtGui import QAction, QIcon, QKeySequence
 from PyQt6.QtCore import Qt, QSize, QThreadPool, QMutex
@@ -13,9 +15,8 @@ from PyQt6.QtWidgets import (
     QStatusBar,
 )
 
-from pyqtgraph.Qt.QtCore import QThread
-import uldaq
-import nixio as nix
+
+import nixio
 import pyqtgraph as pg
 import quantities as pq
 
@@ -110,6 +111,7 @@ class PyRelacs(QMainWindow):
         self.sinus_producer = SinProducer(self.buffer)
 
         self.nix_writer = NixWriter(self.buffer)
+        self.create_nix_file(f"{_root}/test.nix", self.config.metadata)
 
     def create_actions(self):
         self._rlx_exitaction = QAction(QIcon(":/icons/exit.png"), "Exit", self)
@@ -222,6 +224,22 @@ class PyRelacs(QMainWindow):
             repro_toolbar.addAction(repro_action)
         self.addToolBar(Qt.ToolBarArea.BottomToolBarArea, repro_toolbar)
 
+    def create_nix_file(self, file_path, metadata):
+        self.nix_file = nixio.File.open(
+            path=f"{file_path}", mode=nixio.FileMode.Overwrite
+        )
+        self.block = self.nix_file.create_block("recording", "testfile")
+        self.section = self.nix_file.create_section("metadata", "config.yaml")
+        for key, value in asdict(metadata).items():
+            self.section[key] = value
+
+        self.data_array_analog1 = self.block.create_data_array(
+            "Analog1", "ndarray", shape=(1000,), dtype=nixio.DataType.Double
+        )
+        self.data_array_analog2 = self.block.create_data_array(
+            "Analog2", "ndarray", shape=(1000,), dtype=nixio.DataType.Double
+        )
+
     def recenter_continously_plot(self):
         self.continously_plot.refresh()
 
@@ -251,12 +269,33 @@ class PyRelacs(QMainWindow):
         self.continously_plot.plot()
 
     def record(self):
-        nix_writer = Worker(self.nix_writer.write_nix)
+        self.create_nix_file("test.nix", self.config.metadata)
+        log.debug("Created nix file")
+
+        nix_writer = Worker(
+            self.nix_writer.write_nix,
+            data_array=self.data_array_analog1,
+            mutex=self.mutex,
+            channel=0,
+            chunk_size=1000,
+        )
         nix_writer.signals.result.connect(self.print_output)
         nix_writer.signals.finished.connect(self.thread_complete)
         nix_writer.signals.progress.connect(self.progress_fn)
         self.threadpool.start(nix_writer)
 
+        nix_writer2 = Worker(
+            self.nix_writer.write_nix,
+            data_array=self.data_array_analog2,
+            mutex=self.mutex,
+            channel=0,
+            chunk_size=1000,
+        )
+        nix_writer2.signals.result.connect(self.print_output)
+        nix_writer2.signals.finished.connect(self.thread_complete)
+        nix_writer2.signals.progress.connect(self.progress_fn)
+        self.threadpool.start(nix_writer2)
+
     def stop_recording(self):
         self.add_to_textfield("Stopping the recording")
         self.continously_plot.stop_plotting()
@@ -272,6 +311,8 @@ class PyRelacs(QMainWindow):
         if hasattr(PyRelacs, "daq_device"):
             log.debug("Stopping DAQ")
             self.daq_producer.stop_aquisition()
+        embed()
+        exit()
 
     def run_repro(self, n, fn):
         self.text.appendPlainText(f"started Repro {n}, {fn}")