diff --git a/mes_gui.py b/mes_gui.py
new file mode 100644
index 0000000..27fd2c2
--- /dev/null
+++ b/mes_gui.py
@@ -0,0 +1,82 @@
+
+from gdx import gdx
+import threading
+import time
+import csv
+from abc import abstractmethod
+import numpy as np
+
+
+class DataWorker(threading.Thread):
+    def __init__(self, out_filename=""):
+        threading.Thread.__init__(self)
+        self._running = False
+        self._start_time = 0
+
+    @abstractmethod
+    def preprocess(self):
+        pass
+
+    @abstractmethod
+    def read(self):
+        pass
+
+    @abstractmethod
+    def postprocess(self):
+        pass
+
+    def run(self):
+        self.preprocess()
+        self._running = True
+        self._data = np.array([tuple([0] * self._cols)])
+        self._start_time = time.perf_counter()
+        while self._running:
+            measurements = self.read()
+            current_time = time.perf_counter() - self._start_time
+            measurements.insert(0, current_time)
+            if len(measurements) == self._cols:
+                self._data = np.vstack([self._data, measurements])
+            # print(measurements)
+
+    def stop(self):
+        self._running = False
+        self.join(1.0)
+        self.postprocess()
+        self._data = self._data[1:, :]
+
+class GoDirectWorker(DataWorker):
+    def __init__(self, out_filename):
+        super().__init__(out_filename)
+        # Connect GoDirect device
+        self._gdx = gdx.gdx()
+        self._gdx.open(connection="usb")
+        self._gdx.select_sensors([1])
+        self._cols = 2
+        print("GoDirect connected.")
+
+    def preprocess(self):
+        self._gdx.start(50)
+
+    def read(self):
+        return self._gdx.read()
+
+    def postprocess(self):
+        self._gdx.stop()
+        self._gdx.close()
+
+if __name__ == "__main__":
+    godirect_worker = GoDirectWorker("")
+    godirect_worker.start()
+
+    # Wait for stop
+    print("measurement start.")
+    recode_dulation = 3  # sec
+    for i in range(recode_dulation):
+        time.sleep(1)
+        print(i + 1, "/", recode_dulation, "sec")
+    # input("Press ENTER to stop")
+    print("measurement end.")
+    print(godirect_worker._data)
+
+    # Closing
+    godirect_worker.stop()
diff --git a/requirements.txt b/requirements.txt
index 8335da9..5e29431 100644
--- a/requirements.txt
+++ b/requirements.txt
Binary files differ