使用Python调用NI DAQmx

一、硬件：
笔记本电脑Windows 10系统
NI USB-6000
二、软件：
（1）Python版本3.7如下

（2）NI DAQmx16.0

查看板卡对应的设备名称；

（3）安装Python下的DAQmx，使用pip install DAQmx进行安装。
三、参考链接：
NI DAQmx Python API说明参考：
https://nidaqmx-python.readthedocs.io/en/latest/index.html
Control NI DAQ Device with Python and NI DAQmx
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019Pf1SAE&l=zh-CN
四、代码示例

import nidaqmx
import pprint
import numpy as np
from matplotlib import pyplot as plt pp = pprint.PrettyPrinter(indent=4)with nidaqmx.Task() as task:task.ai_channels.add_ai_voltage_chan("Dev1/ai0")print('1 Channel 1 Sample Read: ')data = task.read()pp.pprint(data)data = task.read(number_of_samples_per_channel=1)pp.pprint(data)print('1 Channel N Samples Read: ')data = task.read(number_of_samples_per_channel=10)x=np.arange(0,len(data))pp.pprint(data)plt.plot(x,data)task.ai_channels.add_ai_voltage_chan("Dev1/ai1")print('N Channel 1 Sample Read: ')data = task.read()pp.pprint(data)print('N Channel N Samples Read: ')data = task.read(number_of_samples_per_channel=2)pp.pprint(data)

执行结果如下：

五、示例2：

import nidaqmx
import tkinter as tk
from tkinter import ttkimport matplotlib
matplotlib.use("TkAgg")
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figureclass voltageContinuousInput(tk.Frame):def __init__(self, master):tk.Frame.__init__(self, master)#Configure root tk classself.master = masterself.master.title("Voltage - Continuous Input")self.master.iconbitmap("Voltage - Continuous Input.ico")self.master.geometry("1100x600")self.create_widgets()self.pack()self.run = Falsedef create_widgets(self):#The main frame is made up of three subframesself.channelSettingsFrame = channelSettings(self, title ="Channel Settings")self.channelSettingsFrame.grid(row=0, column=1, sticky="ew", pady=(20,0), padx=(20,20), ipady=10)self.inputSettingsFrame = inputSettings(self, title="Input Settings")self.inputSettingsFrame.grid(row=1, column=1, pady=(20,0), padx=(20,20), ipady=10)self.graphDataFrame = graphData(self)self.graphDataFrame.grid(row=0, rowspan=2, column=2, pady=(20,0), ipady=10)def startTask(self):#Prevent user from starting task a second timeself.inputSettingsFrame.startButton['state'] = 'disabled'#Shared flag to alert task if it should stopself.continueRunning = True#Get task settings from the userphysicalChannel = self.channelSettingsFrame.physicalChannelEntry.get()maxVoltage = int(self.channelSettingsFrame.maxVoltageEntry.get())minVoltage = int(self.channelSettingsFrame.minVoltageEntry.get())sampleRate = int(self.inputSettingsFrame.sampleRateEntry.get())self.numberOfSamples = int(self.inputSettingsFrame.numberOfSamplesEntry.get()) #Have to share number of samples with runTask#Create and start taskself.task = nidaqmx.Task()self.task.ai_channels.add_ai_voltage_chan(physicalChannel, min_val=minVoltage, max_val=maxVoltage)self.task.timing.cfg_samp_clk_timing(sampleRate,sample_mode=nidaqmx.constants.AcquisitionType.CONTINUOUS,samps_per_chan=self.numberOfSamples*3)self.task.start()#spin off call to check self.master.after(10, self.runTask)def runTask(self):#Check if task needs to update the graphsamplesAvailable = self.task._in_stream.avail_samp_per_chanif(samplesAvailable >= self.numberOfSamples):vals = self.task.read(self.numberOfSamples)self.graphDataFrame.ax.cla()self.graphDataFrame.ax.set_title("Acquired Data")self.graphDataFrame.ax.plot(vals)self.graphDataFrame.graph.draw()#check if the task should sleep or stopif(self.continueRunning):self.master.after(10, self.runTask)else:self.task.stop()self.task.close()self.inputSettingsFrame.startButton['state'] = 'enabled'def stopTask(self):#call back for the "stop task" buttonself.continueRunning = Falseclass channelSettings(tk.LabelFrame):def __init__(self, parent, title):tk.LabelFrame.__init__(self, parent, text=title, labelanchor='n')self.parent = parentself.grid_columnconfigure(0, weight=1)self.xPadding = (30,30)self.create_widgets()def create_widgets(self):self.physicalChannelLabel = ttk.Label(self, text="Physical Channel")self.physicalChannelLabel.grid(row=0,sticky='w', padx=self.xPadding, pady=(10,0))self.physicalChannelEntry = ttk.Entry(self)self.physicalChannelEntry.insert(0, "Dev1/ai0")self.physicalChannelEntry.grid(row=1, sticky="ew", padx=self.xPadding)self.maxVoltageLabel = ttk.Label(self, text="Max Voltage")self.maxVoltageLabel.grid(row=2,sticky='w', padx=self.xPadding, pady=(10,0))self.maxVoltageEntry = ttk.Entry(self)self.maxVoltageEntry.insert(0, "10")self.maxVoltageEntry.grid(row=3, sticky="ew", padx=self.xPadding)self.minVoltageLabel = ttk.Label(self, text="Min Voltage")self.minVoltageLabel.grid(row=4,  sticky='w', padx=self.xPadding,pady=(10,0))self.minVoltageEntry = ttk.Entry(self)self.minVoltageEntry.insert(0, "-10")self.minVoltageEntry.grid(row=5, sticky="ew", padx=self.xPadding,pady=(0,10))class inputSettings(tk.LabelFrame):def __init__(self, parent, title):tk.LabelFrame.__init__(self, parent, text=title, labelanchor='n')self.parent = parentself.xPadding = (30,30)self.create_widgets()def create_widgets(self):self.sampleRateLabel = ttk.Label(self, text="Sample Rate")self.sampleRateLabel.grid(row=0, column=0, columnspan=2, sticky='w', padx=self.xPadding, pady=(10,0))self.sampleRateEntry = ttk.Entry(self)self.sampleRateEntry.insert(0, "1000")self.sampleRateEntry.grid(row=1, column=0, columnspan=2, sticky='ew', padx=self.xPadding)self.numberOfSamplesLabel = ttk.Label(self, text="Number of Samples")self.numberOfSamplesLabel.grid(row=2, column=0, columnspan=2, sticky='w', padx=self.xPadding, pady=(10,0))self.numberOfSamplesEntry = ttk.Entry(self)self.numberOfSamplesEntry.insert(0, "100")self.numberOfSamplesEntry.grid(row=3, column=0, columnspan=2, sticky='ew', padx=self.xPadding)self.startButton = ttk.Button(self, text="Start Task", command=self.parent.startTask)self.startButton.grid(row=4, column=0, sticky='w', padx=self.xPadding, pady=(10,0))self.stopButton = ttk.Button(self, text="Stop Task", command=self.parent.stopTask)self.stopButton.grid(row=4, column=1, sticky='e', padx=self.xPadding, pady=(10,0))class graphData(tk.Frame):def __init__(self, parent):tk.Frame.__init__(self, parent)self.create_widgets()def create_widgets(self):self.graphTitle = ttk.Label(self, text="Voltage Input")self.fig = Figure(figsize=(7,5), dpi=100)self.ax = self.fig.add_subplot(1,1,1)self.ax.set_title("Acquired Data")self.graph = FigureCanvasTkAgg(self.fig, self)self.graph.draw()self.graph.get_tk_widget().pack()#Creates the tk class and primary application "voltageContinuousInput"
root = tk.Tk()
app = voltageContinuousInput(root)#start the application
app.mainloop()

运行结果如下：

六、其他代码参见以下：
在本论坛搜索：nidaqmx-python-master.zip

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