python - 传感器读取覆盆子数据

Question

我有以下代码。此代码仅显示代码运行时的传感器读数。它不会自动更新。任何人都可以帮助使传感器读数实时吗？

from PyQt4 import QtGui
from PyQt4 import QtCore
import sys
import Adafruit_DHT
sensor_args = { '11': Adafruit_DHT.DHT11,
        '22': Adafruit_DHT.DHT22,
        '2302': Adafruit_DHT.AM2302 }

humidity, temperature = Adafruit_DHT.read_retry(11, 4)

def main():
    app    = QtGui.QApplication(sys.argv)
    tabs   = QtGui.QTabWidget()
    tab1   = QtGui.QWidget()   
    tab2   = QtGui.QWidget()

    tabs.setWindowTitle('Weather')
    tabs.resize(250, 150)

    vBoxlayout1 = QtGui.QVBoxLayout()
    vBoxlayout2 = QtGui.QVBoxLayout()
    vBoxlayout1.addWidget(QtGui.QLabel('Temp={:0.1f}'.format(temperature) ))
    vBoxlayout2.addWidget(QtGui.QLabel('Humidity={:0.1f}%'.format(humidity) ))
    vBoxlayout1.setAlignment(QtCore.Qt.AlignCenter)
    vBoxlayout2.setAlignment(QtCore.Qt.AlignCenter)

    tab1.setLayout(vBoxlayout1)
    tab2.setLayout(vBoxlayout2)  

    tabs.addTab(tab1,"Temp")
    tabs.addTab(tab2,"Humidity")

    print 'Temp={0:0.1f}*  Humidity={1:0.1f}%'.format(temperature, humidity)

    tabs.show()

    sys.exit(app.exec_())

if ___name___ == '___main___':
    main()

Answer 1

您的代码仅读取传感器一次，因此它永远不会改变，请实现一个线程，以便读取不会中断主线程。

from PyQt4 import QtGui
from PyQt4 import QtCore
import sys

import Adafruit_DHT


class Thread(QtCore.QThread):
    data_sensors = QtCore.pyqtSignal(tuple)

    def run(self):
        while True:
            humidity, temperature = Adafruit_DHT.read_retry(Adafruit_DHT.DHT11, 4)
            self.data_sensors.emit((humidity, temperature))


class TabWidget(QtGui.QTabWidget):
    def __init__(self, parent=None):
        super(TabWidget, self).__init__(parent=parent)
        tab1 = QtGui.QWidget()
        tab2 = QtGui.QWidget()

        self.setWindowTitle('Weather')
        self.resize(250, 150)

        vBoxlayout1 = QtGui.QVBoxLayout()
        vBoxlayout2 = QtGui.QVBoxLayout()
        self.lTemp = QtGui.QLabel('Temp={:0.1f}'.format(0))
        vBoxlayout1.addWidget(self.lTemp)
        self.lHumidity = QtGui.QLabel('Humidity={:0.1f}%'.format(0))
        vBoxlayout2.addWidget(self.lHumidity)

        vBoxlayout1.setAlignment(QtCore.Qt.AlignCenter)
        vBoxlayout2.setAlignment(QtCore.Qt.AlignCenter)

        tab1.setLayout(vBoxlayout1)
        tab2.setLayout(vBoxlayout2)

        self.addTab(tab1, "Temp")
        self.addTab(tab2, "Humidity")

        thread = Thread(self)
        thread.data_sensors.connect(self.update_Sensors)
        thread.start()

    def update_Sensors(self, data):
        humidity, temperature = data
        self.lTemp.setText('Temp={:0.1f}'.format(temperature))
        self.lHumidity.setText('Humidity={:0.1f}%'.format(humidity))


def main():
    app = QtGui.QApplication(sys.argv)
    tabs = TabWidget()
    tabs.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()