pyqt5设计一个带自动测量的示波器代码

以下是一个简单的示波器代码，包含波形绘制、数据采集和处理、自动测量等功能。请注意，此代码仅作为示例，您可能需要根据自己的需求进行修改和调整。

import sys
import numpy as np
import pyqtgraph as pg
from PyQt5.QtWidgets import QApplication, QMainWindow, QGridLayout, QWidget, QLabel, QComboBox, QLineEdit, QPushButton

class Oscilloscope(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = 'Oscilloscope'
        self.setGeometry(100, 100, 800, 600)
        self.central_widget = QWidget()
        self.setCentralWidget(self.central_widget)
        self.grid_layout = QGridLayout(self.central_widget)

        self.plot_widget = pg.PlotWidget()
        self.grid_layout.addWidget(self.plot_widget, 0, 0, 1, 4)

        self.channel_label = QLabel('Channel:')
        self.grid_layout.addWidget(self.channel_label, 1, 0)

        self.channel_combo_box = QComboBox()
        self.channel_combo_box.addItems(['Channel 1', 'Channel 2'])
        self.grid_layout.addWidget(self.channel_combo_box, 1, 1)

        self.voltage_label = QLabel('Voltage:')
        self.grid_layout.addWidget(self.voltage_label, 1, 2)

        self.voltage_line_edit = QLineEdit('5')
        self.grid_layout.addWidget(self.voltage_line_edit, 1, 3)

        self.auto_measure_button = QPushButton('Auto Measure')
        self.auto_measure_button.clicked.connect(self.auto_measure)
        self.grid_layout.addWidget(self.auto_measure_button, 2, 0)

        self.frequency_label = QLabel('Frequency:')
        self.grid_layout.addWidget(self.frequency_label, 2, 1)

        self.frequency_line_edit = QLineEdit('')
        self.grid_layout.addWidget(self.frequency_line_edit, 2, 2)

        self.period_label = QLabel('Period:')
        self.grid_layout.addWidget(self.period_label, 2, 3)

        self.period_line_edit = QLineEdit('')
        self.grid_layout.addWidget(self.period_line_edit, 2, 4)

        self.plot_data = np.random.normal(size=1000)
        self.plot_curve = self.plot_widget.plot(self.plot_data)

        self.timer = pg.QtCore.QTimer()
        self.timer.timeout.connect(self.update_plot)
        self.timer.start(50)

    def update_plot(self):
        self.plot_data[:-1] = self.plot_data[1:]
        self.plot_data[-1] = np.random.normal()
        self.plot_curve.setData(self.plot_data)

    def auto_measure(self):
        channel = self.channel_combo_box.currentIndex() + 1
        voltage = float(self.voltage_line_edit.text())
        data = self.plot_data[-100:]
        max_val = np.max(data)
        min_val = np.min(data)
        frequency = np.mean(1.0 / np.diff(np.where(data > (max_val + min_val) / 2.0)[0])) if np.any(data > (max_val + min_val) / 2.0) else 0.0
        period = 1.0 / frequency if frequency > 0.0 else 0.0
        self.frequency_line_edit.setText('{:.2f}'.format(frequency))
        self.period_line_edit.setText('{:.2f}'.format(period))

if __name__ == '__main__':
    app = QApplication(sys.argv)
    oscilloscope = Oscilloscope()
    oscilloscope.show()
    sys.exit(app.exec_())

在这个示例代码中，我们使用了PyQt5的QMainWindow作为主窗口，并使用QGridLayout布局来放置各种控件。我们使用了pyqtgraph来绘制波形，使用了numpy来生成随机数据。自动测量按钮的点击事件响应函数中，我们使用numpy的一些方法来自动测量波形的频率和周期。