test.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>724</width>
    <height>436</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <property name="sizePolicy">
    <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
     <horstretch>0</horstretch>
     <verstretch>0</verstretch>
    </sizepolicy>
   </property>
   <layout class="QHBoxLayout" name="horizontalLayout_2">
    <item>
     <widget class="QGroupBox" name="plotBox">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
        <horstretch>0</horstretch>
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
      <property name="title">
       <string>Plot</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout_3">
       <item>
        <widget class="PlotWidget" name="us1_plot">
         <property name="frameShape">
          <enum>QFrame::Box</enum>
         </property>
         <property name="interactive">
          <bool>true</bool>
         </property>
         <property name="dragMode">
          <enum>QGraphicsView::NoDrag</enum>
         </property>
         <property name="resizeAnchor">
          <enum>QGraphicsView::NoAnchor</enum>
         </property>
        </widget>
       </item>
       <item>
        <widget class="PlotWidget" name="us2_plot"/>
       </item>
       <item>
        <widget class="PlotWidget" name="us3_plot"/>
       </item>
       <item>
        <widget class="PlotWidget" name="battery_plot"/>
       </item>
      </layout>
     </widget>
    </item>
    <item>
     <widget class="QGroupBox" name="controlBox">
      <property name="title">
       <string>Control</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout_4">
       <item>
        <widget class="QPushButton" name="pushButton">
         <property name="text">
          <string>PushButton</string>
         </property>
        </widget>
       </item>
      </layout>
      <zorder>plotBox</zorder>
      <zorder>pushButton</zorder>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>724</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <customwidgets>
  <customwidget>
   <class>PlotWidget</class>
   <extends>QGraphicsView</extends>
   <header>pyqtgraph</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

test_GUI.py

'''import sys
from PyQt4 import QtCore, QtGui'''

import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
import sys

from test_ui import Ui_MainWindow

class StartQT4(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.us1_plot.setLabel('bottom', 'Time', 's')
        self.ui.us1_plot.setDownsampling(mode='peak')
        self.ui.us1_plot.setClipToView(True)
        self.ui.us1_plot.setLimits(xMax=0)
        self.curve_us1 =  self.ui.us1_plot.plot()
        
        self.us1_data = np.empty(100)
        self.us1_data_ptr = 0
        self.timer = pg.QtCore.QTimer()
        self.timer.timeout.connect(self.update)
        self.timer.start(50)
        
    def update(self):
        self.us1_data[self.us1_data_ptr] = np.random.normal()
        self.us1_data_ptr += 1
        if self.us1_data_ptr >= self.us1_data.shape[0]:
            tmp = self.us1_data
            self.us1_data = np.empty(self.us1_data.shape[0] * 2)
            self.us1_data[:tmp.shape[0]] = tmp
        self.curve_us1.setData(self.us1_data[:self.us1_data_ptr])
        self.curve_us1.setPos(-self.us1_data_ptr, 0)
        self.curve_us1.setData(self.us1_data[:self.us1_data_ptr])
        
if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    myapp = StartQT4()
    myapp.show()
    sys.exit(app.exec_())