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If you're looking for an air pressure sensor that's accurate and affordable, the Barometer Phidget has you covered. It connects to a VINT port and measures absolute pressures within the range of 50kPa and 110kPa, making it great for barometer applications (See the Connection & Compatibility tab for a list of VINT Hubs). If you happen to read a pressure outside of this range, an error will be thrown telling you that the measurement has saturated.
Once you have an absolute pressure reading, you can correct for altitude, resulting in a corrected atmospheric pressure reading. Alternatively, you could calibrate the sensor to measure changes in elevation, making it an altimeter. For more details on how to implement these calculations, see the technical section of the User Guide.
This Phidget is a smart device that must be controlled by a VINT Hub. For more information about VINT, have a look at the VINT Primer. You can use a Phidget Cable to simply and easily connect the two devices. Here's a list of all of the different VINT Hubs currently available:
|Image||Part Number||Price||Number of VINT Ports||Controlled By|
|HUB5000_0||$60.00||6||Local Network (Ethernet or Wi-Fi)|
Use a Phidget cable to connect this device to the hub. You can solder multiple cables together in order to make even longer Phidget cables, but you should be aware of the effects of having long wires in your system.
Welcome to the PRE1000 user guide! In order to get started, make sure you have the following hardware on hand:
Next, you will need to connect the pieces:
Now that you have everything together, let's start using the PRE1000!
In order to demonstrate the functionality of the PRE1000, the Phidget Control Panel running on a Windows machine will be used.
The Phidget Control Panel is available for use on both macOS and Windows machines.
To open the Phidget Control Panel on Windows, find the icon in the taskbar. If it is not there, open up the start menu and search for Phidget Control Panel
To open the Phidget Control Panel on macOS, open Finder and navigate to the Phidget Control Panel in the Applications list. Double click on the icon to bring up the Phidget Control Panel.
For more information, take a look at the getting started guide for your operating system:
Linux users can follow the getting started with Linux guide and continue reading here for more information about the PRE1000.
After plugging the PRE1000 into your computer and opening the Phidget Control Panel, you will see something like this:
The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:
The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.
Double-click on the Pressure Sensor object, labelled Barometer Phidget, in order to run the example
General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:
Before you can access the device in your own code, and from our examples, you'll need to take note of the addressing parameters for your Phidget. These will indicate how the Phidget is physically connected to your application. For simplicity, these parameters can be found by clicking the button at the top of the Control Panel example for that Phidget.
In the Addressing Information window, the section above the line displays information you will need to connect to your Phidget from any application. In particular, note the Channel Class field as this will be the API you will need to use with your Phidget, and the type of example you should use to get started with it. The section below the line provides information about the network the Phidget is connected on if it is attached remotely. Keep track of these parameters moving forward, as you will need them once you start running our examples or your own code.
You are now ready to start writing your own code for the device. The best way to do that is to start from our Code Samples.
Select your programming language of choice from the drop-down list to get an example for your device. You can use the options provided to further customize the example to best suit your needs.
Once you have your example, you will need to follow the instructions on the page for your programming language to get it running. To find these instructions, select your programming language from the Programming Languages page.
The PRE1000 reports the absolute pressure of its surroundings. In other words, the pressure compared to a perfect vacuum. If you plan on using this sensor as a barometer, you need to convert to barometric pressure. You can use conversion calculators such as this above sea level barometer reading correction calculator to make the adjustment based on your location's elevation.
Since the PRE1000 makes absolute pressure measurements, you could use it with a temperature sensor to measure changes in altitude, as long as you know your pressure and height to begin with. The following is the barometric formula:
This formula can be rearranged for as follows:
A long-run test was performed to compare the accuracy of the PRE1000 with that of the 1141 - Asolute Gas Pressure Sensor. For 87 hours, both sensors measured the absolute air pressure indoors in the same room, with the same change sensitivity.
As you can see, the PRE1000 is significantly less noisy. The average difference between any two successive samples for the 1141 is 237.17Pa, while for the PRE1000, it is 3.19Pa. Both sensors consistently differ by an average of 1.23kPa, but this error could be easily calibrated out due to the consistency of the offset.
|Sensor Type||Gas Pressure (Absolute)|
|Pressure Min||50 kPa|
|Pressure Max||110 kPa|
|Pressure Resolution||250 mPa|
|Pressure Noise Max||* 5 Pa|
|Sampling Interval Max||60 s/sample|
|Sampling Interval Min||100 ms/sample|
|Current Consumption Min||25 μA|
|Current Consumption Max||4 mA|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||85 °C|
|Date||Board Revision||Device Version||Comment|
|June 2017||0||104||Product Release|
|PressureSensor||Visual Studio GUI||C#||Windows||Download|
|PressureSensor||Visual Basic .NET||Windows||Download|
|Image||Part Number||Price||Sensor Type||Pressure Min||Pressure Max||Pressure Differential Min||Pressure Differential Max||Pressure Resolution|
|1126_1B||$30.00||Gas Pressure (Differential)||—||—||-25 kPa||25 kPa||55 Pa|
|1136_0||$32.00||Gas Pressure (Differential)||—||—||-2 kPa||2 kPa||5 Pa|
|1137_0||$32.00||Gas Pressure (Differential)||—||—||-7 kPa||7 kPa||17 Pa|
|1138_0||$32.00||Gas Pressure (Differential)||—||—||0 Pa||50 kPa||56 Pa|
|1140_1B||$30.00||Gas Pressure (Absolute)||20 kPa||400 kPa||—||—||413 Pa|
|1141_0||$32.00||Gas Pressure (Absolute)||15 kPa||115 kPa||—||—||111 Pa|
|PRE1000_0||$15.00||Gas Pressure (Absolute)||50 kPa||110 kPa||—||—||250 mPa|