Using USB-6008fdsfsfsdfaafds in CSharp.pdf

Using USB-6008
in Visual Studio/C#
Hans-Petter Halvorsen

Contents
• Visual Studio/C#
• What is DAQ?
• Using USB-6008 in C#
• Analog In
• Analog Out
• Using Timer, Charts, etc.
USB-6008
I/O Module

Software
• Visual Studio/C#
• DAQmx Driver
• DAQmx Driver can be downloaded for free
from Internet

DAQ
Hans-Petter Halvorsen, M.Sc.
Data Acquisition

DAQ – Data Acquisition
A DAQ System consists of 4 parts:
1. Physical input/output signals, sensors
2. DAQ device/hardware
3. Driver software
4. Your software application (Application software)
NI DAQmx Driver
Your App created
with C#
NI USB 6008 DAQ Device
Sensors, etc.

AD Converter
DA Converter
Measurement Signal
Control Signal
USB
AD & DA Converters
AD – Analog to Digital
DA – Digital to Analog
All Analog Signals needs to be converted to
Digital Signals before the Computer can use
them (AD Converter).

Continuous Signal
Discrete Signal A computer can only deal
with discrete signals
k = 0, 1, 2, 3, 4, ....
Ts = Sampling Time
When Ts -> 0, we have a continuous signal,
but in a computer that is not possible.
Continuous
vs.
Discrete
Signals

Sampling and Aliasing
Original Signal
Aliasing (“Nedfolding”) -> The Sampling Rate is to low!
Sampling Time
Sampling Frequency

USB-6008

How-To use USB-6008 with Visual Studio
USB
Analog I/O
Digital I/O
USB-6008
PC with Visual Studio

NI USB-6008 I/O Module
Specifications:
• 8 analog inputs, AI (12-bit, 10 kS/s, -10-10V)
• 2 analog outputs, AO (12-bit, 150 S/s, 0-5V)
• 12 digital I/O (DI/DO)
• 32-bit counter
Note! DAQmx Driver is needed!!
4 different types of Signals:
AO – Analog Output
AI – Analog Input
DO – Digital Output
DI – Digital Input
USB Connection -10-10V
0-5V

DAQmx Driver

NI DAQmx Driver
• National Instruments provides a native .NET API for NI-
DAQmx. This is available as a part of the NI-DAQmx
driver
• In order to install the DAQmx API for C#, make sure to
select “Custom” and then “.NET Support” when
installing the DAQmx driver.
• Next, make sure that you select .NET Framework X.x
Support for the version of .NET that your version of
Visual Studio is using.

MAX – Measurement & Automation Explorer
NI USB-6008 “Dev1”
You may change the name (“Dev1”)

Analog In
C# Examples

Read Analog Values
We will read the voltage values on different batteries

Read Analog Signals with USB-6008
Multimeter
USB
9V
9V

A 9V Battery is connected to
Analog In on USB-6008

Simple DAQ in C# with DAQmx
using NationalInstruments.DAQmx;
…
Task analogInTask = new Task();
AIChannel myAIChannel;
myAIChannel = analogInTask.AIChannels.CreateVoltageChannel(
"dev1/ai0",
"myAIChannel",
AITerminalConfiguration.Differential,
0,
5,
AIVoltageUnits.Volts
);
AnalogSingleChannelReader reader = new
AnalogSingleChannelReader(analogInTask.Stream);
double analogDataIn = reader.ReadSingleSample();
txtAnalogIn.Text = analogDataIn.ToString("0.00");
Analog In Example

…
"dev1/ai0",
"myAIChannel",
0,
5,
);
AnalogSingleChannelReader reader = new
AnalogSingleChannelReader(analogInTask.Stream);
txtAnalogIn.Text = analogDataIn.ToString("0.00");

Add References to the DAQmx Driver
in Visual Studio
We also need to add the following Namespaces: NationalInstruments.DAQmx.dll
Select «Browse» and Find
NationalInstruments.DAQmx.dll
C:Program Files (x86)National Instruments...

Using USB-6008fdsfsfsdfaafds in CSharp.pdf

using System;
using System.Windows.Forms;
namespace DAQRead
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnRead_Click(object sender, EventArgs e)
{
"dev1/ai0",
"myAIChannel",
0,
10,
);
AnalogSingleChannelReader reader = new AnalogSingleChannelReader(analogInTask.Stream);
txtDaqValue.Text = analogDataIn.ToString("0.00");
}
}
}

Analog Out
C# Examples

Simple DAQ in C# with DAQmx
…
Task analogOutTask = new Task();
AOChannel myAOChannel;
myAOChannel = analogOutTask.AOChannels.CreateVoltageChannel(
"dev1/ao0",
"myAOChannel",
0,
5,
AOVoltageUnits.Volts
);
AnalogSingleChannelWriter writer = new
AnalogSingleChannelWriter(analogOutTask.Stream);
double analogDataOut;
analogDataOut = Convert.ToDouble(txtAnalogOut.Text);
writer.WriteSingleSample(true, analogDataOut);
Analog Out Example

…
"dev1/ao0",
"myAOChannel",
0,
5,
);

DAQ in C# with DAQmx – Analog Out
private void btnWriteAnalogOut_Click(object sender, EventArgs e)
{
"dev1/ao0",
"myAOChannel",
0,
5,
);
}

Analog Out + Analog In

Write/Read Data using USB-6008

Improvements

Improvements
• Using a Timer
• Trend/Plot the Data from the DAQ device in a
Chart
• Create and Use separate Classes for
implementing the DAQ code
• …

Timer
public Form1()
{
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
… //Read from DAQ Device
… //Formatting
… //Plot Data
}
Timer Event:
Initialization:
Properties:
Structure your Code
properly!!
Define Classes and Methods
which you can use here
In Visual Studio you may want to use a Timer instead of a While Loop in
order to read values at specific intervals.
You may specify the Timer Interval
in the Properties Window
Select the “Timer” component in the
Toolbox
Double-click on the Timer object in
order to create the Event
2
3
4
1

using System;
using System.Windows.Forms;
namespace DAQReadwithTimer
{
public partial class Form1 : Form
{
public Form1()
{
timer1.Interval = 1000;//ms
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
"dev1/ai0",
"myAIChannel",
0,
10,
);
AnalogSingleChannelReader reader = new AnalogSingleChannelReader(analogInTask.Stream);
txtDaqRead.Text = analogDataIn.ToString("0.00");
}
}
}

Trending Data in Visual Studio
https://msdn.microsoft.com/en-us/library/dd489237.aspx
Visual Studio has a Chart control that you can use in Windows Forms or Web application (ASP.NET)
http://www.i-programmer.info/programming/uiux/2756-getting-started-with-net-charts.html
using System.Windows.Forms.DataVisualization.Charting;
...
chart1.Series.Clear();
chart1.Series.Add("My Data");
chart1.Series["My Data"].ChartType = SeriesChartType.Line;
...
int[] x = {1, 2, 3, 4, 5, 6, 7, 8};
int[] y = {20, 22, 25, 24, 28, 27, 24, 26};
for (int i = 0; i < x.Length; i++)
{
chart1.Series["My Data"].Points.AddXY(x[i],y[i]);
}
Creating a Web App? Use the following Namespace instead:
System.Web.UI.DataVisualization.Charting

Hans-Petter Halvorsen
University of South-Eastern Norway
www.usn.no
E-mail: hans.p.halvorsen@usn.no
Web: https://www.halvorsen.blog

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