[PyQt] Assign Label Text as number in Hz

[Alfalfa]

You have to use a QThread for your freq analyzer, then emit a signal to update the gui. For PyQt4 it would be something like this:

import sys
import time
from PyQt4 import QtGui, QtCore

class WorkerThread(QtCore.QObject):
    updateFreq = QtCore.pyqtSignal(int)

    def __init__(self):
        super().__init__()

    @QtCore.pyqtSlot()
    def run(self):
        freq = 0
        while True:
            freq += 1
            self.updateFreq.emit(freq)
            time.sleep(5)

class Main(QtGui.QMainWindow):
    def __init__(self):
        super().__init__()
        self.worker = WorkerThread()
        self.workerThread = QtCore.QThread()  # Move the Worker object to the Thread object
        self.workerThread.started.connect(self.worker.run)  # Init worker run() at startup
        self.worker.moveToThread(self.workerThread)
        self.worker.updateFreq.connect(self.updateFreq)  # Connect your signals/slots
        self.workerThread.start()

    def updateFreq(self, freq):
        #self.ui.freqLabel.setText(str(freq) + " Hz")
        print(freq)

if __name__== '__main__':
    app = QtGui.QApplication([])
    gui = Main()
    sys.exit(app.exec_())