Fixes bug related to the mux_barrier in hardware system

hardware_system.py

@@ -68,6 +68,7 @@ class OhmPiHardware:
         self.readings = np.array([])  # time series of acquired data
         self._start_time = None  # time of the beginning of a readings acquisition
         self._pulse = 0  # pulse number
+        self.mux_barrier = Barrier(len(self.mux_boards)+1)
 
     def _clear_values(self):
         self.readings = np.array([])