使用QSerialPort更改arduino值以使用python进行绘图

如何解决使用QSerialPort更改arduino值以使用python进行绘图

以this question和this question为基础，我正在尝试将值发送到arduino，以使用arduino代码更改值以使用matplotlib和pyqt5进行绘图（使用引脚11和A0之间的RC电路） ，因此建议使用here，将其DC设置为A0，在这里，我将进一步研究python代码可能出现的错误），

int PinOutput = 11;
int PinInput = A0;
int inph;
int inpl;
int input;

void setup() {
  // put your setup code here,to run once:
Serial.begin(9600);
pinMode(PinInput,INPUT);
pinMode(PinOutput,OUTPUT);
delay(100);
}

void loop() {
  // put your main code here,to run repeatedly:
  if(Serial.available())

  {

    input = Serial.read();         
 
  }

  else
{
 
    input = 255;

}
    inpl = analogRead(PinInput)/4;
    Serial.println(inpl);
    analogWrite(PinOutput,input);
    delay(100);
    inph = analogRead(PinInput)/4;
    Serial.println(inph);
    analogWrite(PinOutput,input/2);
    delay(100); 

}

和python代码

import sys

from PyQt5 import QtCore,QtWidgets,QtSerialPort

from matplotlib.figure import Figure
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg

class SerialManager(QtCore.QObject):
    valueChanged = QtCore.pyqtSignal(float)

    def __init__(self,parent=None):
        super().__init__(parent)
        self.serial_port = QtSerialPort.QSerialPort("COM3")
        self.serial_port.setBaudRate(QtSerialPort.QSerialPort.Baud9600)
        self.serial_port.errorOccurred.connect(self.handle_error)
        self.serial_port.readyRead.connect(self.handle_ready_read)
        self.serial_port.open(QtCore.QIODevice.ReadWrite)

    def handle_ready_read(self):
        while self.serial_port.canReadLine():
            codec = QtCore.QTextCodec.codecForName("UTF-8")
            line = codec.toUnicode(self.serial_port.readLine()).strip().strip("\x00")
            try:
                value = float(line)
            except ValueError as e:
                print("error",e)
            else:
                self.valueChanged.emit(value)

    def handle_error(self,error):
        if error == QtSerialPort.QSerialPort.NoError:
            return
        print(error,self.serial_port.errorString())
        
    def send(self,value):
        self.serial_port.write(value.text().encode())

class MainWindowm(QtWidgets.QMainWindow):
    def __init__(self,*args,**kwargs):
        super(MainWindowm,self).__init__(*args,**kwargs)

        self.canvas = FigureCanvasQTAgg(Figure(figsize=(5,4),dpi=100))
        self.setCentralWidget(self.canvas)

        self.axes = self.canvas.figure.subplots()

        n_data = 10
        self.xdata = list(range(n_data))
        self.ydata = [0 for i in range(n_data)]

    def update_plot(self,value):
        self.ydata = self.ydata[1:] + [value]
        self.axes.cla()
        self.axes.plot(self.xdata,self.ydata,"r")
        self.canvas.draw()

class Ui_MainWindow(object):
    def setupUi(self,MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(325,300)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(110,20,61,16))
        self.label.setObjectName("label")
        self.textEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.textEdit.setGeometry(QtCore.QRect(90,60,104,71))
        self.textEdit.setObjectName("textEdit")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(100,150,75,23))
        self.pushButton.setObjectName("pushButton")
        self.pushButton2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton2.setGeometry(QtCore.QRect(100,200,100,23))
        self.pushButton2.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0,325,21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

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

    def retranslateUi(self,MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow","test window"))
        self.label.setText(_translate("MainWindow","pyqt5 tests"))
        self.textEdit.setPlaceholderText('enter text')
        self.pushButton.setText(_translate("MainWindow","plot button"))
        self.pushButton.clicked.connect(self.display) 
        self.pushButton.clicked.connect(self.plot)     
        self.pushButton2.setText(_translate("MainWindow","update plot button"))
        self.pushButton2.clicked.connect(self.write)        
        
    def plot(self):
        self.w = MainWindowm()
        self.w.show()
        manager.valueChanged.connect(self.w.update_plot)    
        
    def display(self):
        print(self.textEdit.text())    
        
    def write(self):
        manager.send(self.textEdit)

class MainWindow(QtWidgets.QMainWindow,Ui_MainWindow):
    def __init__(self,parent=None):
        super().__init__(parent)
        self.setupUi(self)

    def update_text(self,value): 
        self.label.setNum(value)        

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    manager = SerialManager()    
    w1 = MainWindow()
    w1.show()

    manager.valueChanged.connect(w1.update_text)

    sys.exit(app.exec_())

因此，我尝试使用“绘图”按钮开始绘图，然后使用“更新绘图”按钮对其进行更新以绘制新值。但是，当我输入一个值并按“更新绘图”按钮时，当我尝试输入数字时（它在DC值之间振荡），所有绘图都停滞不前，并且绘图不使用新值进行更新。任何有关如何使arduino更新和绘制新值的想法都将有所帮助。