PyQtGraph实时绘制多行数据

Question

我试图在PyQtGraph中绘制来自arduino的多行数据。我希望代码本身能够识别需要绘制多少行数据，但目前我在PyQtGraph中没有看到任何数据。 这是我的代码，我已经试过了

from PyQt5 import QtWidgets, QtCore
from pyqtgraph import PlotWidget, plot
import pyqtgraph as pg
import sys 
import os
import serial
import numpy as np


class MainWindow(QtWidgets.QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        self.graphWidget = pg.PlotWidget()
        self.graphWidget.plotItem.showGrid(x=True, y=True, alpha=0.5)

        self.setCentralWidget(self.graphWidget)
        self.ser = serial.Serial('/dev/cu.SLAB_USBtoUART', 9600) 
        self.x1 = np.array([])
        self.y1 = np.array([])
        self.xp = np.array([])
        self.yp = np.array([])
        self.dateien = 0 
        self.count = 0

        self.graphWidget.setBackground('w')

        self.timer = QtCore.QTimer()
        self.timer.setInterval(1)
        self.timer.timeout.connect(self.get_Data)
        self.timer.start()

        pen = pg.mkPen(color=(255, 0, 0), width=20)
        self.data_line =  self.graphWidget.plot(self.xp, self.yp, pen=pen)

    def plot(self, xp, yp):
        self.data_line.setData(xp, yp)

    def get_Data(self): 
        self.data = self.ser.readline()
        try:
            self.count = self.count + 1
            self.x1 = np.append(self.x1, self.count)
            self.decoded_data = str(self.data[0:len(self.data)-2].decode("utf-8"))
            self.dataArray = self.decoded_data.split()
            array_length = len(self.dataArray)
            for i in range(array_length): 
                 self.dateien = self.dataArray[i]
                 self.y1 = np.append(self.y1, float(self.dateien))
                 print(self.x1.shape, self.y1.shape)
                 self.data_line.setData(self.x1, self.y1)
        except (UnicodeDecodeError): 
             print("Error")

app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())

“UnicodeDecodeError”在第一次读取串行数据时出现。 我的当前输出如下所示：

Exception: X and Y arrays must be the same shape--got (122,) and (121,).

最后它应该看起来像arduino绘图仪。你知道吗