How do i create a button to get the following updates of a signal in PyQt5?

Question

This is my code. It simulate a signal that i get from a oscilloscope. I'm trying to create a interface, but i am new at coding (and english), and i got some problems.

i already create a real time plot graph and a button,but when clicked, the signal stop to update and i just get the same signal over and over again. I just need to know how to keeping updating the signal while i'm in the loop, if it is possible.

import pyqtgraph as pg
import numpy as np 
import sys
from PyQt5 import QtGui
from PyQt5.QtWidgets import *
from PyQt5.QtCore import QThread, pyqtSignal

class plotarT(QThread):
    signal = pyqtSignal(object)

    def __init__(self):
        QThread.__init__(self)
        self.phase = 0

    def __del__(self):
        self.wait()

    def update(self):
        self.t = np.arange(0, 3.0, 0.01)
        self.s = np.sin(2 * np.pi * self.t + self.phase) #sin function
        self.phase += 0.1
        QThread.msleep(2500) #To simulate the time that oscilloscope take to respond


    def run(self):
        while True:
            self.update()
            self.signal.emit(self.s) #this emit the vectors


class Window(QDialog):
    def __init__(self):
        self.app = QtGui.QApplication(sys.argv)
        super().__init__()
        self.title = "PyQt5 GridLayout"
        self.top = 100
        self.left = 100
        self.width = 1000
        self.height = 600
        self.InitWindow()
        self.traces = dict()
        pg.setConfigOptions(antialias=True)

    def InitWindow(self):
        self.setWindowIcon(QtGui.QIcon("icon.png"))
        self.setWindowTitle(self.title)
        self.setGeometry(self.top, self.left, self.width, self.height)

        self.gridLayoutCreation()
        vboxLayout = QVBoxLayout()
        vboxLayout.addWidget(self.groupBox)
        self.setLayout(vboxLayout)

        self.show()

    def gridLayoutCreation(self): #my interface
        self.groupBox = QGroupBox("Grid Layout Example")

        gridLayout = QGridLayout()
        self.guiplot = pg.PlotWidget()
        gridLayout.addWidget(self.guiplot,0,8,8,12)


        BtnL = QPushButton('Test')
        gridLayout.addWidget(BtnL, 0, 1)
        self.tlg = QLineEdit('')
        gridLayout.addWidget(self.tlg, 1,1)

        self.groupBox.setLayout(gridLayout)

        BtnL.clicked.connect(self.get_data)

    def get_data(self):
        raw1 = []
        raw2 = []
        for i in range(2): #the signal does not update while running the loop
            raw1.append(self.s)
            time.sleep(1)
            print(self.s)

    def plotar(self,s): #here i plot the vector
        self.s = s
        self.guiplot.clear()
        self.guiplot.plot(s)

    def teste(self):
        self.get_thread = plotarT()
        self.get_thread.signal.connect(self.plotar) #connect to function
        self.get_thread.start()


def main():  
    app = QtGui.QApplication(sys.argv)
    form = Window()
    form.show()
    form.teste()
    app.exec_()

if __name__ == '__main__': #Run my aplicattion
    main()

Answer 1

Try it:

import pyqtgraph as pg
import numpy as np 
import sys
from PyQt5 import QtGui
from PyQt5.QtWidgets import *
from PyQt5.QtCore import QThread, pyqtSignal, QTimer                       # + QTimer

class plotarT(QThread):
    signal = pyqtSignal(object)

    def __init__(self):
        QThread.__init__(self)
        self.phase = 0

    def __del__(self):
        self.wait()

    def update(self):
        self.t = np.arange(0, 3.0, 0.01)
        self.s = np.sin(2 * np.pi * self.t + self.phase) #sin function
        self.phase += 0.1
        QThread.msleep(500)                                                 # 500

    def run(self):
        while True:
            self.update()
            self.signal.emit(self.s)       #this emit the vectors


class Window(QDialog):
    def __init__(self):
        self.app = QtGui.QApplication(sys.argv)
        super().__init__()
        self.title = "PyQt5 GridLayout"
        self.top = 100
        self.left = 100
        self.width = 1000
        self.height = 600
        self.InitWindow()
        self.traces = dict()
        pg.setConfigOptions(antialias=True)

        self.timer = QTimer(self, timeout=self.pipe_output, interval=1000)  # +++

    def InitWindow(self):
        self.setWindowIcon(QtGui.QIcon("icon.png"))
        self.setWindowTitle(self.title)
        self.setGeometry(self.top, self.left, self.width, self.height)

        self.gridLayoutCreation()
        vboxLayout = QVBoxLayout()
        vboxLayout.addWidget(self.groupBox)
        self.setLayout(vboxLayout)

        self.show()

    def gridLayoutCreation(self):     #my interface
        self.groupBox = QGroupBox("Grid Layout Example")

        gridLayout = QGridLayout()
        self.guiplot = pg.PlotWidget()
        gridLayout.addWidget(self.guiplot,0,8,8,12)


        BtnL = QPushButton('Test')
        gridLayout.addWidget(BtnL, 0, 1)
        self.tlg = QLineEdit('')
        gridLayout.addWidget(self.tlg, 1,1)

        self.groupBox.setLayout(gridLayout)

        BtnL.clicked.connect(self.get_data)



    def get_data(self):
#        raw1 = []
#        raw2 = []
#        for i in range(2): #the signal does not update while running the loop
#            raw1.append(self.s)
#            time.sleep(1)
#            print(self.s)

# +++ vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv            
        self.timer.start()                                                     
        self.raw1 = []                                                         
        self.raw2 = []                                                         
        self.i = 0                                                             

    def pipe_output(self):    
        self.i += 1 
        self.raw1.append(self.s)   
        print("\n ----------- \n", self.s)        

        if self.i == 2:
            self.timer.stop()
# +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^            


    def plotar(self, s):           # here i plot the vector
        print("def plotar(self, s):", type(s))
        self.s = s
        self.guiplot.clear()
        self.guiplot.plot(self.s)                                  #(s)

    def teste(self):
        self.get_thread = plotarT()
        self.get_thread.signal.connect(self.plotar) #connect to function
        self.get_thread.start()


def main():  
    app = QtGui.QApplication(sys.argv)
    form = Window()
    form.show()
    form.teste()
    app.exec_()

if __name__ == '__main__': #Run my aplicattion
    main()