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The Barometer Phidget is an air pressure sensor. With this Phidget you can read absolute pressure. It’s great for calculating accurate atmospheric pressure. This Phidget connects to your computer through a VINT Hub.
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.
The Barometer Phidget measures absolute pressures within the range of 50kPa and 110kPa at a resolution of 250 mPa. If you read air pressures outside this range, an error event will trigger.
You can use your Control Panel to explore your Phidget's channels.
1. Open your Control Panel, and you will find the following channel:
2. Double click on the channel to open the example program. This channel belongs to the PressureSensor channel class:
In your Control Panel, double click on "Barometer Phidget":
Before you open a Phidget channel in your program, you can set these properties to specify which channel to open. You can find this information through the Control Panel.
1. Open the Control Panel and double-click on the red map pin icon:
2. The Addressing Information window will open. Here you will find all the information you need to address your Phidget in your program.
See the Phidget22 API for your language to determine exact syntax for each property.
The Change Trigger is the minimum change in the sensor data needed to trigger a new data event. The Data Interval is the time (in ms) between data events sent out from your Phidget. You can modify one or both of these values to achieve different data outputs. You can learn more about these two properties here.
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 - Absolute 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|
|Canadian HS Export Code||9026.20.00|
|American HTS Import Code||9026.20.40.00|
|Country of Origin||CN (China)|
|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|