Language - LabVIEW

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Example Code


Getting Started with LabVIEW

Welcome to using Phidgets with LabVIEW! By using LabVIEW, you will have access to the complete Phidget22 API, including events. We also provide example code in LabVIEW for all Phidget devices.


If you haven't already, please visit the Windows page before you continue reading. There you will be instructed on how to properly set up your Windows machine so you can follow the guides below!

Use our examples

One of the best ways to start programming with Phidgets is to use our example code as a guide. In order to run the examples, you will need to download and install the LabVIEW from National Instruments.

Next, download and unpack the Phidgets LabVIEW library:

Rename the unpacked folder to Phidgets

Labview rename.png

Navigate to the following directory:

  • For 32-bit LabVIEW -> C:/Program Files (x86)/National Instruments/LabVIEW 20xx/instr.lib
  • For 64-bit LabVIEW -> C:/Program Files/National Instruments/LabVIEW 20xx/instr.lib

Place the renamed folder at this location:

Labview copy.png

Next, open LabVIEW and create a new VI:

Labview newvi.png

Navigate to the block diagram window that was generated and open the functions palette (View -> Functions Palette). Next, navigate to the Phidgets palette (Instrument I/O -> Instrument Drivers -> Phidgets):

Labview functionspalette.PNG

Next, select a palette that will work for your Phidget and drag the VI onto your block diagram:

Labview vitree.png

Right-click on VI and select Open Front Panel:

Labview openfrontpanel.png

From the front panel, navigate to the block diagram (Window -> Block Diagram):

Labview showblock.png

The examples are located near the bottom of the block diagram. Right-click the example you would like to use and select Open Front Panel:

Labview runexample.png

When you are ready, press run and the application will demonstrate the Phidget's functionality. Here is an example of an Accelerometer channel on a Spatial Phidget:

Labview run.PNG

You should now have the example up and running for your device. Play around with the device and experiment with some of the functionality. When you are ready, the next step is configuring your environment and writing your own code!

Configure your environment

If you haven't already, jump back and take a look at the use our examples section above. There you will be instructed on how to properly set up LabVIEW so you can follow the guides below. If you are ready, keep reading.

To begin configuring your environment, we recommend enabling the Show constant labels setting in LabVIEW . This setting will reduce complexity when developing, and is especially recommended for beginners. To enable the setting, first navigate to Tools -> Options on your block diagram:

Labview options.png

Select the Environment category and enable Show created constant labels located at the bottom of the screen:

Labview showconstantlabels.png

To begin working with Phidgets, you will need both a StartPhidget VI and a ClosePhidget VI:

Labview startclose.png

Select a class that will work with your Phidget from the drop-down menu:

Labview selectclass.png

You can now add device information or any initialization parameters to the StartPhidget VI. Using your mouse, hover over the connections to see information about it:

Labview hover.png

If you would like to add device information or initialization parameters, right-click the connection and navigate to one of the following:

  • Create -> Constant
  • Create -> Control
Labview createcontrol.png

Creating a constant will allow you to modify device information from the block diagram:

Labview constant.PNG

Creating a control will allow you to modify device information from the front panel:

Labview control.png

The environment now has access to Phidgets. Next, view the write your own code section located below.

Write Code

By following the instructions for your operating system and compiler above, you probably now have a working example and want to understand it better so you can change it to do what you want. This teaching section has resources for you to learn from the examples and write your own.

Your main reference for writing LabVIEW code will be this page, the examples, the Phidget22 API, and the VI help files.

Examples of more complex general topics such as using multiple Phidgets and connecting to a Phidget over the Network Server can be found under the VI Tree for the Phidget Common palette.

Example Flow

Most LabVIEW examples follow the same basic flow of starting a Phidget, reading some data, and closing the Phidget.

Digital Input Example.png

Code Snippets

The following code snippets describe how to do various general tasks with Phidgets. You should be able to find places in the examples where these snippets exist, and modify them to suit your requirements.

Step One: Initialize, Open and Wait for Attachment (plugging in) of the Phidget

The entire process of opening and initializing a Phidget can be done by using the version of that corresponds to your device.

In most cases, will also attempt to wait for the first data to become available from the device for 5 seconds after initialization.

StartPhidget VI.png

If you'd prefer to initialize the device manually, you can use for your device and call the individual functions to set up the device.


Step Two: Do Things with the Phidget

You can read data and interact with your Phidget both by polling it for its current state (or to set a state), or by catching events that trigger when the data changes.

To poll devices, simply place the corresponding blocks.

LabVIEW polling 1.png LabVIEW polling 2.png

To use events, there are three main blocks for each type, to create, execute, and close the event handler.

When creating the event, all devices using an event of the same type must be grouped into an array to ensure the events get processed correctly.

Event Array grouping.png

Once created, the events will be processed by [Name] When an event occurs, the pertinent information will be output, as well as information to reference which device caused it.

Event Exe.png

After a program has run its course, the event handler must be closed.

Event Close.png

Step Three: Close and Delete

Closing a Phidget is done by using the appropriate version of

Close Phidget VI.png

Further Reading

Phidget Programming Basics - Here you can find the basic concepts to help you get started with making your own programs that use Phidgets.

Data Interval/Change Trigger - Learn about these two properties that control how much data comes in from your sensors.

Using Multiple Phidgets - It can be difficult to figure out how to use more than one Phidget in your program. This page will guide you through the steps.

Polling vs. Events - Your program can gather data in either a polling-driven or event-driven manner. Learn the difference to determine which is best for your application.

Logging, Exceptions, and Errors - Learn about all the tools you can use to debug your program.

Phidget Network Server - Phidgets can be controlled and communicated with over your network- either wirelessly or over ethernet.