def __init__(self, parent=None): QtGui.QWidget.__init__(self, parent) self.ui = Ui_Dialog() self.ui.setupUi(self) # Set your serial Port/Baudrate/time between two value changes(in second) Here. self.device = copter('/dev/ttyUSB0', 19200, 0) #def event(self, event): #print event.type() #if (event.type()==QtCore.QEvent.KeyPress) and (event.key()==QtCore.Qt.Key_Tab): #self.emit(QtCore.SIGNAL("tabPressed")) #return True #QtCore.QObject.connect(self.ui.verticalSlider, QtCore.SIGNAL("sliderMoved(int)"), self.adjust_rotor) #QtCore.QObject.connect(self.ui.verticalSlider, QtCore.SIGNAL("valueChanged(int)"), self.adjust_rotor) QtCore.QObject.connect(self.ui.pushButton, QtCore.SIGNAL("clicked()"), QtCore.QCoreApplication.instance().quit) QtCore.QObject.connect(self.ui.dial, QtCore.SIGNAL("leftPressed"), lambda: self.device.adjust_direction('x', '-')) QtCore.QObject.connect(self.ui.dial, QtCore.SIGNAL("rightPressed"), lambda: self.device.adjust_direction('x', ' ')) QtCore.QObject.connect(self.ui.dial, QtCore.SIGNAL("downPressed"), lambda: self.device.adjust_direction('y', '-')) QtCore.QObject.connect(self.ui.dial, QtCore.SIGNAL("upPressed"), lambda: self.device.adjust_direction('y', ' ')) QtCore.QObject.connect(self.ui.dial, QtCore.SIGNAL("rotorUp"), lambda: self.device.adjust_rotor(' ')) QtCore.QObject.connect(self.ui.dial, QtCore.SIGNAL("rotorDown"), lambda: self.device.adjust_rotor('-')) QtCore.QObject.connect(self.ui.dial, QtCore.SIGNAL("directionReleased"), self.device.init_direction)