void PlotWindow::realtimeDataSlot(double value0)
{
    double key = QDateTime::currentDateTime().toMSecsSinceEpoch()/1000.0;
    plot_ui->customPlot->graph(0)->addData(key, value0);
    plot_ui->customPlot->graph(1)->clearData();
    plot_ui->customPlot->graph(1)->addData(key, value0);
    plot_ui->customPlot->graph(0)->removeDataBefore(key-10);
    plot_ui->customPlot->xAxis->setRange(key+0.25, 10, Qt::AlignRight);
    plot_ui->customPlot->replot();
}