I designed the interface, and the custom component tried to output multiple drawing components, and the program crashed after a while.

The program probably consists of the following:ble. Py reads the bluetooth values temporarily holding the EMG array. main_plot.py instantiates the Show_EMG plotting class and outputs the Show_EMG plotting class reading the Bluetooth values of ble.PY

The program crashed itself without reporting any errors, I tried to output errors at different terminals.

ERROR MESSAGE:

CMD:

pyqtgraph Component Code(Show_EMG.py):

import ble
from pyqtgraph import PlotWidget
import pyqtgraph as pg
import numpy as np
from PyQt5 import QtCore

class Plot_Show(object):
    '''
    Form,y,x,data,length = 1800, width = 250, high = 120, text = "sEMG Voltage"
    '''
    def __init__(self,Form,y,x,data,text=""):
        # length = 1800, width = 250, high = 120, text = "sEMG Voltage"
        self.Form=Form
        self.y=y
        self.x=x
        self.data=ble.EMG[data]
        self.length=1800
        if(text==""):
            self.test="sEMG Voltage"
        else:
            self.text = text
        self.graphicsView = PlotWidget(self.Form)
        self.initUI()


    def initUI(self):

        self.graphicsView.setGeometry(QtCore.QRect(self.y, self.x, 250, 120))
        self.graphicsView.hideButtons()
        self.graphicsView.setObjectName(self.text)


        self.graphicsView.setLabel(axis="left",text=self.text)
        self.graphicsView.setLabel(axis='bottom',text='Time')
        self.graphicsView.setMouseEnabled(x=False,y=False)
        self.graphicsView.setAntialiasing(True)
        self.graphicsView.setMenuEnabled(False)
        self.graphicsView.hideButtons()
        self.data1 = np.zeros(self.length)
        self.curve1 = self.graphicsView.plot(self.data1)
        self.ptr1 = 0

        def update1():
            global data1, ptr1
            self.graphicsView.setRange(xRange=[self.ptr1,self.ptr1 self.length],yRange=[5,550],padding=0)
            self.data1[:-1] = self.data1[1:]  # shift data in the array one sample left

            self.data1[-1] = self.data

            self.ptr1  = 1
            self.curve1.setData(self.data1)
            self.curve1.setPos(self.ptr1, 0)

        self.timer = pg.QtCore.QTimer()
        self.timer.timeout.connect(update1)
        self.timer.start(10)

main_plot.py Code:

import ble
import sys

import Show_EMG
from PyQt5 import QtCore, QtWidgets
import threading

class Ui_Form(object):
    def __init__(self):
        super().__init__()

    def setupUi(self, Form,**kwargs):
        Form.resize(820, 454)
        Form.setObjectName("Form")

                Show_EMG.Plot_Show(Form=Form, y=10, x=10, data=0, text="sEMG2 Voltage")
        Show_EMG.Plot_Show(Form=Form, y=10, x=140, data=1, text="sEMG2 Voltage")
        Show_EMG.Plot_Show(Form=Form, y=10, x=270, data=2, text="sEMG3 Voltage")
        Show_EMG.Plot_Show(Form=Form, y=280, x=10, data=3, text="sEMG4 Voltage")
        Show_EMG.Plot_Show(Form=Form, y=280, x=140, data=4, text="sEMG5 Voltage")
        Show_EMG.Plot_Show(Form=Form, y=280, x=270, data=5, text="sEMG6 Voltage")
        Show_EMG.Plot_Show(Form=Form, y=550, x=10, data=0, text="sEMG7 Voltage")
        Show_EMG.Plot_Show(Form=Form, y=550, x=140, data=0, text="sEMG8 Voltage")

        self.gridLayoutWidget = QtWidgets.QWidget(Form)
        self.gridLayoutWidget.setGeometry(QtCore.QRect(550, 270, 261, 121))
        self.gridLayoutWidget.setObjectName("gridLayoutWidget")
        self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.gridLayout.setObjectName("gridLayout")
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(370, 410, 75, 23))
        self.pushButton.setObjectName("pushButton")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        self.pushButton.setText(_translate("Form", "开始记录"))
        Form.setWindowTitle(_translate("Form", "Form"))

def main():
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    thread_main=threading.Thread(target=main)
    thread_main.start()
    thread_ble=threading.Thread(target=ble.ble)
    thread_ble.start()

Ble.EMG array default temporarily to:[200. 0. 0. 0. 0. 0.]

More Ble Code detail:

Frankly, if all plots get data from the same source and in the same time then you could use one QTimer to run all update1 in all plots - but this timer should be in UIForm instead of PlotShow