PDFIntroduction
National Instruments high-performance data acquisition products include our premier NI-DAQmx driver, delivering increased performance and productivity in a variety of programming languages, including C#/Visual Basic .NET (VB .NET), Visual Basic 6.0 (VB 6), LabWindows/CVI and ANSI C/C++. The following text-based NI-DAQmx examples include both shipping and additional examples to help shorten your development time. These examples are divided by programming language and measurement type. Examples without links are shipping examples, and their locations are indicated under each section. Shipping examples may not be installed by default; support for C/C++ and/or .NET must be checked at the beginning of the NI-DAQmx driver installation process.
Choose Your Text Based Language
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| C#/Visual Basic.NET | Visual Basic 6 | CVI | ANSI C |
C#.NET and Visual Basic.NET (VB.NET)
We offer a number NI-DAQmx examples in C# and Visual Basic .NET (VB .NET). In the following table, examples that are not linked are shipping examples. Shipping examples are installed when you install NI-DAQmx and their default location is:
- Windows XP and Prior: C:\Documents and Settings\All Users\Shared Documents\National Instruments\NI-DAQ\Examples\
- Windows Vista: C:\Users\Public\Public Documents\National Instruments\NI-DAQ\Examples.
| Analog Input | Analog Output | Counters | Digital I/O | Switches | Control | Synchronization | Misc |
| Analog Input | Measure Voltage | Acquire One Voltage Sample |
| Acquire Voltage Samples - External Clock | ||
| Acquire Voltage Samples - Internal Clock | ||
| Acquire Voltage Samples - Internal Clock - Analog Start Trigger | ||
| Acquire Voltage Samples - Internal Clock - Digital Reference Trigger | ||
| Acquire Voltage Samples - Internal Clock - Analog Reference Trigger | ||
| Acquire Voltage Samples - Internal Clock - Digital Start and Reference Triggers | ||
| Acquire Multiple Voltage Samples - Software Timed | ||
| Continuously Acquire Voltage Samples - Internal Clock | ||
| Continuously Acquire Voltage Samples - Internal Clock - Software Trigger | ||
| Continuously Acquire Voltage Samples - Internal Clock - Save to File | ||
| Continuously Acquire Voltage Samples - Internal Clock - Pause Trigger | ||
| Continuously Acquire Voltage Samples - Internal Clock - Analog Start | ||
| Continuously Acquire Voltage Samples - External Clock | ||
| Continuously Acquire Voltage Samples - External Clock - Digital Start | ||
| Continuously Acquire Voltage Samples - Software Timed | ||
| Continuously Acquire Voltage Samples - Configure Filter - SCXI 114x | ||
| Measure Temperature | Continuously Acquire RTD Samples - Internal Clock | |
| Continuously Acquire Thermocouple Samples - Internal Clock | ||
| Continuously Acquire Thermocouple Samples - Software Timed | ||
| Measure Strain | Acquire Strain Samples | |
| Acquire Wheatstone Bridge Samples | ||
| Measure Sound Pressure | Continuously Acquire Sound Pressure Samples | |
| Rotary Position | Continuously Acquire RVDT Samples - Internal Clock | |
| Linear Position | Continuously Acquire LVDT Samples - Internal Clock | |
| Frequency | Continuously Acquire Frequency - Internal Clock - SCXI 1126 | |
| Current | Continuously Acquire 20mA Current Samples - Internal Clock | |
| Acceleration | Continuously Acquire Acceleration Sample - Internal Clock - Analog Start | |
| Analog Output | Generate Voltage | Continuously Generate Voltage Waveform - Internal Clock |
| Continuously Generate Voltage Waveform - Internal Clock - Analog Start | ||
| Continuously Generate Voltage Waveform - External Clock | ||
| Continuously Generate Voltage Waveform - External Clock - Digital Start | ||
| Generate Multiple Voltage Updates - Internal Clock | ||
| Generate Multiple Voltage Updates - Internal Clock - Digital Clock | ||
| Generate Multiple Voltage Updates - Software Timed | ||
| Generate Voltage Update | ||
| Counters | Count Digital Events | Count Digital Events |
| Count Digital Events - Pause Trigger | ||
| Count Digital Events - Finite Buffered - External Clock | ||
| Count Digital Events - Continuous Buffered - External Clock | ||
| Measure Period or Pulse Width | Measure Semi Period - Buffered Finite | |
| Measure Single Semi-Period | ||
| Measure Single Period - Low Frequency - 1 Counter | ||
| Measure Digital Periods - Buffered Continuous - High Frequency - 2 Counters | ||
| Measure Pulse Width | ||
| Measure Pulse Width - Buffered Continuous - Sample Clock | ||
| Measure GPS Timestamp | Measure GPS Timestamp | |
| Measure Position | Measure Angular Position - Buffered Continuous - External Clock | |
| Measure Digital Frequency | Measure Digital Frequency - Buffered Continuous - Large Range - 2 Counters | |
| Measure Digital Frequency - Low Frequency - 1 Counter | ||
| Measure Two Edge Separation | Measure Two Edge Separation | |
| Measure Two Edge Separation - Buffered Continuous | ||
| Generate Pulse | Generate Digital Pulse | |
| Generate Single Pulse - Retriggerable | ||
| Generate Single Pulse - Digital Start Trigger | ||
| Generate Digital Pulse Train - Finite | ||
| Generate Digital Pulse Train - Finite - Retriggerable | ||
| Generate Digital Pulse Train - Finite - Digital Start Trigger | ||
| Generate Digital Pulse Train - Continuous | ||
| Generate Digital Pulse Train - Continuous - Digital Start | ||
| Generate Digital Pulse Train - Continuous - Pause Trigger | ||
| Digital I/O | Generate Values | Write Digital Port |
| Write Digital Channel | ||
| Write Digital Channel - External Clock | ||
| Write Digital Channel - Watchdog Timer | ||
| Continuously Write Digital Channel - Burst | ||
| Continuously Write Digital Channel - Pipe Sample Clock | ||
| Continuously Write Digital Channel - Pipe Sample Clock with Handshake | ||
| Read Values | Read Digital Port | |
| Read Digital Port - External Clock | ||
| Read Digital Channel | ||
| Read Digital Channel - Change Detection | ||
| Read Digital Channel - Change Detection - Digital Filter | ||
| Read Digital Channel - Change Detection - Events | ||
| Read Digital Channel - Internal Clock - Pattern Match Start | ||
| Continuously Read Digital Channel - External Clock | ||
| Continuously Read Digital Channel - Pipe Sample Clock with Handshake | ||
| Switches | Switch Connect - 2 Channels | |
| Switch Connect - Multiple Channels | ||
| Sequence Connections On Switch | ||
| Switch Controlling Individual Relay | ||
| Switch Scanning - Software Trigger | ||
| Control | General | PWM Counter Output |
| Synchronization | Multi-Function | Synchronize Analog Input and Read Digital Channel |
| Synchronize Analog Input and Analog Output - Digital Start | ||
| Multi-Device | Analog Input Finite Acquisition | |
| Analog Input Continuous Acquisition | ||
| Analog Input and Analog Output Shared Timebase and Trigger - DSA | ||
| Other Advanced Topics | Properties | List DAQmx Devices Present in System |
Browse NI Developer Zone for More Examples...
Visual Basic 6.0 (VB 6)
The following is a list of our NI-DAQmx examples for Visual Basic 6.0. The default install directory is for shipping examples is C:\Documents and Settings\All Users\Documents\National Instruments\NI-DAQ\Examples\Visual Basic 6.0.
| Analog Input | Measure Voltage |
| Measure Slow Varying Signal | |
| Analog Output | Generate Voltage |
| Counter | Count Digital Events |
| Generate Pulse | |
| Digital I/O | Generate Values |
| Read Values |
Browse NI Developer Zone For More Examples...
LabWindows/CVI
The default installation directory for LabWindows/CVI examples is C:\Documents and Settings\All Users\Documents\National Instruments\CVI\samples\DAQmx.
| Analog Input | Analog Output | Counters | Digital I/O | Switches | Control | Synchronization |
| Analog Input | Measure Voltage | Acquire One Voltage Sample |
| Acquire Voltage Samples - External Clock | ||
| Acquire Voltage Samples - Internal Clock | ||
| Acquire Voltage Samples - Internal Clock - Analog Start Trigger | ||
| Acquire Voltage Samples - Internal Clock - Digital Reference Trigger | ||
| Acquire Voltage Samples - Internal Clock - Digital Start and Reference Triggers | ||
| Acquire Multiple Voltage Samples - Software Timed | ||
| Continuously Acquire Voltage Samples - Internal Clock | ||
| Continuously Acquire Voltage Samples - Internal Clock - Digital Pause Trigger | ||
| Continuously Acquire Voltage Samples - Internal Clock - Analog Start | ||
| Continuously Acquire Voltage Samples - External Clock - Digital Start | ||
| Continuously Acquire Voltage Samples - Software Timed | ||
| Measure Temperature | Continuously Acquire RTD Samples - Internal Clock | |
| Continuously Acquire Thermocouple Samples - Internal Clock | ||
| Measure Strain | Continuously Acquire Strain Samples | |
| Measure Sound Pressure | Continuously Acquire Sound Pressure Samples - Internal Clock | |
| Rotary Position | Continuously Acquire RVDT Samples - Internal Clock - SCXI 1540 | |
| Linear Position | Continuously Acquire LVDT Samples - Internal Clock - SCXI 1540 | |
| Frequency | Continuously Acquire Frequency - Internal Clock - SCXI 1126 | |
| Current | Continuously Acquire 20mA Current Samples - Internal Clock | |
| Acceleration | Continuously Acquire Acceleration Sample - Internal Clock - Analog Start | |
| Analog Output | Voltage | Generate Single Sample |
| Multiple Voltage Updates - Internal Clock | ||
| Multiple Voltage Updates - Internal Clock - Digital Start | ||
| Multiple Voltage Updates - Internal Clock - Done Event | ||
| Multiple Voltage Updates - Software Timed | ||
| Continuously Generate Voltage - Internal Clock | ||
| Continuously Generate Voltage - Internal Clock - Analog Start | ||
| Continuously Generate Voltage - External Clock | ||
| Continuously Generate Voltage - External Clock - Digital Start | ||
| Current | Multiple Current Updates - Internal Clock | |
| Continuously Generate Current - Internal Clock | ||
| Generate 20mA Current | ||
| Counters | Count Digital Events | Count Digital Events |
| Continuously Count Digital Events - Buffered - External Clock | ||
| Digital Frequency | Measure Digital Frequency - Low Frequency - 1 Counter | |
| Measure Digital Frequency - Buffered - Continuous - Large Range - 2 Counters | ||
| GPS Time Stamp | GPS Timestamp | |
| GPS Timestamp - Finite - Buffered | ||
| Period of Pulse Width | Measure Pulse Width | |
| Measure Pulse Width - Buffered - Sample Clock | ||
| Measure Digital Periods - Buffered - Continuous - High Frequency - 2 Counters | ||
| Measure Semi Period - Buffered - Finite | ||
| Position | Measure Angular Position - Buffered - Continuous | |
| Two-Signal Edge-Separation | Measure Two Edge Separation - Buffered - Continuous | |
| Measure Two Edge Separation | ||
| Generate Digital Pulses | Generate Digital Pulse | |
| Generate Digital Pulse Train - Continuous | ||
| Generate Digital Pulse Train - Continuous - Digital Start | ||
| Generate Digital Pulse Train - Continuous - Pause Trigger | ||
| Digital I/O | Generate Values | Write Digital Port |
| Write Digital Channel | ||
| Write Digital Channel - Watchdog Timer | ||
| Write Digital Channel - External Clock | ||
| Continuously Write Digital Port - External Clock | ||
| Continuously Write Digital Channel - Burst | ||
| Continuously Write Digital Channel - Pipe Sample Clock with Handshaking | ||
| Digital Measurements | Read Digital Port | |
| Read Digital Port - External Clock | ||
| Read Digital Channel | ||
| Read Digital Channel - Internal Clock - Digital Reference Trigger | ||
| Read Digital Channel - Change Detection | ||
| Read Digital Channel - Change Detection Event | ||
| Read Digital Channel - Change Detection - Digital Filter | ||
| Continuously Read Digital Channel - External Clock | ||
| Continuously Read Digital Channel - Pipe Sample Clock with Handshake | ||
| Switches | Connect Multiple Channels | |
| Connect Two Channels | ||
| Control Individual Relay | ||
| Sequence Connections On Switch | ||
| Switch Scan - Software Trigger | ||
| Control | General | PID Control - Single Channel |
| PWM - Counter Output | ||
| Synchronization | Multi-Device | Continuous Analog Input |
| DSA Shared Timebase and Triggered Analog Input and Analog Output | ||
| Finite Analog Input | ||
| Multi-Function | Continuous Analog Input and Read Digital Channel |
Browse NI Developer Zone For More Examples...
ANSI C
The default installation directory for ANSI C examples is:
- Windows XP and Prior: C:\Documents and Settings\All Users\Shared Documents\National Instruments\NI-DAQ\Examples\DAQmx ANSI C
- Windows Vista: C:\Users\Public\Public Documents\National Instruments\NI-DAQ\Examples\DAQmx ANSI C.
| Analog Input | Analog Output | Counters | Digital I/O | Switches | Synchronization |
| Analog Input | Measure Voltage | Acquire One Voltage Sample |
| Acquire Voltage Samples - External Clock | ||
| Acquire Voltage Samples - Internal Clock | ||
| Acquire Voltage Samples - Internal Clock - Analog Start Trigger | ||
| Acquire Voltage Samples - Internal Clock - Digital Reference Trigger | ||
| Acquire Voltage Samples - Internal Clock - Digital Start and Reference Triggers | ||
| Acquire Multiple Voltage Samples - Software Timed | ||
| Continuously Acquire Voltage Samples - Internal Clock | ||
| Continuously Acquire Voltage Samples - Internal Clock - Digital Pause Trigger | ||
| Continuously Acquire Voltage Samples - Internal Clock - Analog Start | ||
| Continuously Acquire Voltage Samples - External Clock - Digital Start | ||
| Continuously Acquire Voltage Samples - Software Timed | ||
| Measure Temperature | Continuously Acquire RTD Samples - Internal Clock | |
| Continuously Acquire Thermocouple Samples - Internal Clock | ||
| Measure Strain | Continuously Acquire Strain Samples | |
| Measure Sound Pressure | Continuously Acquire Sound Pressure Samples - Internal Clock | |
| Rotary Position | Continuously Acquire RVDT Samples - Internal Clock - SCXI 1540 | |
| Linear Position | Continuously Acquire LVDT Samples - Internal Clock - SCXI 1540 | |
| Frequency | Continuously Acquire Frequency - Internal Clock - SCXI 1126 | |
| Current | Continuously Acquire 20mA Current Samples - Internal Clock | |
| Acceleration | Continuously Acquire Acceleration Sample - Internal Clock - Analog Start | |
| Analog Output | Voltage | Generate Single Sample |
| Multiple Voltage Updates - Internal Clock | ||
| Multiple Voltage Updates - Internal Clock - Digital Start | ||
| Multiple Voltage Updates - Software Timed | ||
| Continuously Generate Voltage - Internal Clock | ||
| Continuously Generate Voltage - Internal Clock - Analog Start | ||
| Continuously Generate Voltage - External Clock | ||
| Continuously Generate Voltage - External Clock - Digital Start | ||
| Current | Multiple Current Updates - Internal Clock | |
| Continuously Generate Current - Internal Clock | ||
| Generate 20mA Current | ||
| Counters | Count Digital Events | Count Digital Events |
| Continuously Count Digital Events - Buffered - External Clock | ||
| Digital Frequency | Measure Digital Frequency - Low Frequency - 1 Counter | |
| Measure Digital Frequency - Buffered - Continuous - Large Range - 2 Counters | ||
| GPS Time Stamp | GPS Timestamp | |
| GPS Timestamp - Finite - Buffered | ||
| Period of Pulse Width | Measure Pulse Width | |
| Measure Pulse Width - Buffered - Sample Clock | ||
| Measure Digital Periods - Buffered - Continuous - High Frequency - 2 Counters | ||
| Measure Semi Period - Buffered - Finite | ||
| Position | Measure Angular Position - Buffered - Continuous | |
| Two-Signal Edge-Separation | Measure Two Edge Separation - Buffered - Continuous | |
| Measure Two Edge Separation | ||
| Generate Digital Pulses | Generate Digital Pulse | |
| Generate Digital Pulse Train - Continuous | ||
| Generate Digital Pulse Train - Continuous - Digital Start | ||
| Generate Digital Pulse Train - Continuous - Pause Trigger | ||
| Digital I/O | Generate Values | Write Digital Port |
| Write Digital Channel | ||
| Write Digital Channel - Watchdog Timer | ||
| Write Digital Channel - External Clock | ||
| Continuously Write Digital Port - External Clock | ||
| Continuously Write Digital Channel - Burst | ||
| Continuously Write Digital Channel - Pipe Sample Clock with Handshaking | ||
| Digital Measurements | Read Digital Port | |
| Read Digital Port - External Clock | ||
| Read Digital Channel | ||
| Read Digital Channel - Internal Clock - Digital Reference Trigger | ||
| Read Digital Channel - Change Detection | ||
| Read Digital Channel - Change Detection - Digital Filter | ||
| Continuously Read Digital Channel - External Clock | ||
| Continuously Read Digital Channel - Pipe Sample Clock with Handshake | ||
| Switches | Connect Multiple Channels | |
| Connect Two Channels | ||
| Control Individual Relay | ||
| Sequence Connections On Switch | ||
| Switch Scan - Software Trigger | ||
| Synchronization | Multi-Device | Continuous Analog Input |
| DSA Shared Timebase and Triggered Analog Input and Analog Output | ||
| Finite Analog Input | ||
| Multi-Function | Continuous Analog Input and Read Digital Channel |
Browse NI Developer Zone For More Examples...
Code Generation DAQ Assistant with LabWindows/CVI and Measurement Studio
The DAQ Assistant is provided when using Measurement Studio or LabWindows/CVI with NI-DAQmx. The DAQ Assistant is a graphical, interactive guide for configuring, testing, and acquiring measurement data. With a single click, you can generate code based on your configuration, making it easier and faster to develop complex operations. Because the DAQ Assistant is completely menu-driven, the time from setup to first measurement can be drastically reduced.
- Using the DAQ Assistant in LabWindows/CVI
- Using the DAQ Assistant in Measurement Studio for Microsoft Visual Studio
- Getting Started with NI-DAQmx
