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Notice: This page contains information for the legacy Phidget21 Library.

Phidget21 is out of support. Bugfixes may be considered on a case by case basis.

Phidget21 does not support VINT Phidgets, or new USB Phidgets released after 2020. We maintain a selection of legacy devices for sale that are supported in Phidget21.

We recommend that new projects be developed against the Phidget22 Library.


Click on the 2phidget22.jpg button in the menu bar to go to the Phidget22 version of this page.

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Contact Us

From Phidgets Legacy Support


Need support? We are here to help. Give us a call, or send us an email. When you send an email be sure to include as much information as possible about the problem, your computer (OS is the important part), which Phidgets you are using or wanting to use (serial numbers aren't important), driver/library version and any other relevant information. The more information you give us the better we can help you!


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If you're looking for a solution right now, check out our documentation. We want our documentation to be so good that when you are, say, coding away with a pressing deadline and the clock reading 1:00 am, you can find the answer right then and there, on our web site. Because we've been there at 1:00 am too.

We know you're the type of person who doesn't need to sit through basic website help. You want to know how to wire something up for more sensitivity, what the API function call for reading raw data is called, how to limit ground loops, or how to build cool projects. So that is what our documentation is full of.

And every week - yes, every single week - we sit down and discuss every technical support request that comes through. And we ask ourselves: how can we make our documentation better for you? So try it out:

  • Check out the product pages on our main website for specifications, products, and photos
  • Or, start at our wiki home page for software documentation and projects, as well as our General Troubleshooting guide.