如何解决所有线程均未与QThread以及QtSerialPort对于Arduino和Matplotlib一起运行
我正在尝试从arduino获取输出,以在两个pyqt窗口中进行更新,其中一个是matplotlib图。如果我注释掉非绘图线程窗口,则绘图有效。但是当我尝试同时运行两者时,我收到消息
ActiveRecord::Schema.define(version: 2020_08_17_190727) do
create_table "item_instances",options: "ENGINE=InnoDB DEFAULT CHARSET=latin1",force: :cascade do |t|
t.integer "inv_number"
t.string "serial"
t.integer "po_number"
t.date "po_date"
t.date "invoice"
t.date "date_out"
t.decimal "cost",precision: 8,scale: 2
t.string "acro"
t.datetime "created_at",null: false
t.datetime "updated_at",null: false
t.bigint "item_id"
t.index ["item_id"],name: "fk_rails_6ea33fd9d0"
end
create_table "items",force: :cascade do |t|
t.string "description"
t.decimal "cost",scale: 2
t.decimal "list_price",scale: 2
t.datetime "created_at",null: false
t.boolean "active"
end
add_foreign_key "item_instances","items"
end
但是,尽管有窗口,但图中未显示任何内容。非图窗口将使用值进行更新。我不确定是否应该使用QThreadpool而不是QThread。附带说明,如果我尝试重新运行代码,则会收到消息
3 Device is already open
3 Device is already open
因此,在再次运行python脚本之前,我必须拔下并重新插入arduino,再次上传其代码,并且两个窗口均未更新值。 我使用的arduino代码只是在1秒的时间间隔内发出信号以进行测试,
2 Access is denied.
2 Access is denied.
2 Access is denied.
引脚13连接到arduino上的A0的位置。 python代码是
int PinOutput = 13;
int PinInput = A0;
int inph;
int inpl;
void setup() {
// put your setup code here,to run once:
Serial.begin(9600);
pinMode(PinInput,INPUT);
pinMode(PinOutput,OUTPUT);
}
void loop() {
// put your main code here,to run repeatedly:
inpl = analogRead(PinInput)/4;
Serial.println(inpl);
analogWrite(PinOutput,255);
delay(1000);
inph = analogRead(PinInput)/4;
Serial.println(inph);
analogWrite(PinOutput,0);
delay(1000);
}
因此,我正在尝试使arduino输出全局可用,然后供不同线程同时使用,并在两个窗口中进行更新,其中一个带有绘图。有关如何执行此操作的任何信息都会有所帮助,谢谢。
解决方法
我假设OP正在使用my old answer,并且在该解决方案中表明使用QSerialPort避免了不必要的线程使用,在这种情况下也是如此。另一方面,串行端口不能由多个类处理。在这种情况下,您只需要创建一个管理串行端口并将信息分发到其他元素的类即可。
import sys
from PyQt5 import QtCore,QtWidgets,QtSerialPort
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg
class Ui_MainWindow(object):
def setupUi(self,MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(325,237)
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.QTextEdit(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")
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.pushButton.setText(_translate("MainWindow","test button"))
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 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)
self.label.adjustSize()
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:
print(line)
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())
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
w1 = MainWindow()
w1.show()
w = MainWindowm()
w.show()
manager = SerialManager()
manager.valueChanged.connect(w1.update_text)
manager.valueChanged.connect(w.update_plot)
sys.exit(app.exec_())
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