Products for USB Sensing and Control

Products for USB Sensing and Control

PHIDGETS Inc.

Unit 1 - 6115 4 St SE
Calgary AB  T2H 2H9
Canada
+1 403 282-7335

Barometer Phidget

ID: PRE1000_0

Precisely measure the absolute air pressures between 50 and 110 kPa with this barometer that connects to any VINT port.

$15.00

Quantity Available: 488

Qty Price
5 $14.25
10 $13.50
25 $12.00
50 $10.50
100 $9.75
250 $9.00
500 $8.25
1000 $7.50

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 "Compatible Products" 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.



Altitude Measurement

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.

Product Specifications

Board Properties
Controlled By VINT
Sensor Properties
Sensor Type Gas Pressure (Absolute)
Pressure Min 50 kPa
Pressure Max 110 kPa
Pressure Resolution 250 mPa
Measurement Error Max ± 0.62 %
Relative Measurement Error Max ± 0.08 %
Sampling Interval Max 60 s/sample
Sampling Interval Min 100 ms/sample
Electrical Properties
Current Consumption Min 25 μA
Current Consumption Max 4 mA
Physical Properties
Operating Temperature Min -40 °C
Operating Temperature Max 85 °C

Software Objects

Channel NameAPIChannel
Barometer PressureSensor 0

API


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Documents

Library & Driver Downloads

Code Samples

APILanguageOS
PressureSensor C Multiple Download
PressureSensor C# Windows Download
PressureSensor Java Multiple Download
PressureSensor JavaScript Any Download
PressureSensor Objective-C macOS Download
PressureSensor Python Multiple Download
PressureSensor Visual Basic .NET Windows Download

Product History

Date Board Revision Device Version Comment
June 20170104Product Release

Getting Started

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:

PRE1000 Functional.jpeg
  1. Connect the PRE1000 to the VINT Hub using the Phidget cable.
  2. Connect the VINT Hub to your computer with a USB cable.


Now that you have everything together, let's start using the PRE1000!

Using the PRE1000

Phidget Control Panel

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. If you would like to follow along, first 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.

First Look

After plugging the PRE1000 into your computer and opening the Phidget Control Panel, you will see something like this:

PRE1000 Panel.jpg


The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:

  • Serial number: allows you to differentiate between similar Phidgets.
  • Channel: allows you to differentiate between similar objects on a Phidget.
  • Version number: corresponds to the firmware version your Phidget is running. If your Phidget is listed in red, your firmware is out of date. Update the firmware by double-clicking the entry.


The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.

Pressure Sensor

Double-click on the Pressure Sensor object, labelled Barometer Phidget, in order to run the example

PressureSensor Example.jpg


General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:

  • Modify the change trigger and/or data interval value by dragging the sliders. For more information on these settings, see the data interval/change trigger page.

Technical Details

Barometric Temperature Correction

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.

Use as an Altimeter

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:



where

is the pressure at height
is the pressure at height zero
is the molar mass of earth's air (0.0289644 kg/mol)
is the gravitational constant (9.80665 m/s^2)
is the current height
is the universal gas constant (8.3144598 J/(mol*K))
is the standard temperature in degrees Kelvin.


This formula can be rearranged for as follows:


Accuracy

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.

VINTBAR graph.jpg


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.

What to do Next

  • Software Overview - Find your preferred programming language here to learn how to write your own code with Phidgets!
  • General Phidget Programming - Read this general guide to the various aspects of programming with Phidgets. Learn how to log data into a spreadsheet, use Phidgets over the network, and much more.
  • Phidget22 API - The API is a universal library of all functions and definitions for programming with Phidgets. Just select your language and device and it'll give you a complete list of all properties, methods, events, and enumerations that are at your disposal.

VINT Hubs

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:

Product Board
Image Part Number Price Number of VINT Ports
HUB0000_0 $30.00 6
SBC3003_0 $120.00 6

Phidget Cables

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.

Product Physical Properties
Image Part Number Price Cable Length
3002_0 $2.00 600 mm
3003_0 $1.50 100 mm
3004_0 $3.00 3.5 m
3034_0 $1.50 150 mm
3038_0 $2.25 1.2 m
3039_0 $2.75 1.8 m

Here's a list of our gas pressure sensors:

Product Sensor Properties
Image Part Number Price Sensor Type Pressure Min Pressure Max Pressure Differential Min Pressure Differential Max Pressure Resolution
1126_1 $32.00 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_0 $32.00 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