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

Wheatstone Bridge Phidget

ID: DAQ1500_0
Recommended for new designs: This product (or a similar replacement with a compatible form, fit and function) is estimated to be available for ten years or more.

Measure up to 2 load cells or Wheatstone Bridge-based sensors with this input module. Connects to a VINT port.

$30.00

Quantity Available: 598

Qty Price
5 $28.50
10 $27.00
25 $24.00
50 $21.00
100 $19.50
250 $18.00
500 $16.50
1000 $15.00

The Wheatstone Bridge Phidget uses a high-resolution analog-to-digital converter (ADC) to read up to two load cells, strain gauges, pressure sensors, piezoelectric sensors, or Wheatstone Bridge-based sensors. Wheatstone Bridge-based sensors are a common type of resistive sensor that produces a small voltage differential. This Phidget connects to your computer through a VINT Hub.

Features:

  • 24-bit analog to digital converter - Accurate measurements with a maximum resolution of 59.6 nV/V
  • Adjustable Resolution - Change the bridge gain in the software to 1, 2, 64, or 128. This change is not fixed but can be modified in your program when required.
  • Retrieve data as often as every 20 milliseconds.

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 Controlled By
HUB0000_0 $30.00 6 USB (Mini-USB)
HUB5000_0 $60.00 6 Local Network (Ethernet or Wi-Fi)
SBC3003_0 $120.00 6

Load Cells

Functional

You can connect up to four load cells to the DAQ1500 in order to measure the amount of strain in the cell. See the product page or manual for your load cell to learn how to hook it up. We have a variety of types available to measure different types of strain: shear, compression, and tension. See the Load Cell Primer for more information.

Product Sensor Properties
Image Part Number Price Sensor Type Weight Capacity Max Creep Zero Balance Cell Repeatability Error Max Cell Non-Linearity Max Cell Hysteresis Max
3132_0 $6.00 Shear Load Cell 780 g 1.6 g/hr ± 11.7 g ± 390 mg 390 mg 390 mg
3133_0 $7.00 Shear Load Cell 5 kg 5 g/hr ± 75 g ± 2.5 g 2.5 g 2.5 g
3134_0 $7.00 Shear Load Cell 20 kg 20 g/hr ± 300 g ± 10 g 10 g 10 g
3135_0 $7.00 Shear Load Cell 50 kg 50 g/hr ± 750 g ± 25 g 25 g 25 g
3136_0 $45.00 Compression Load Cell 50 kg 20 g/hr ± 500 g ± 100 g 100 g
3137_0 $45.00 Compression Load Cell 200 kg * 40 g/hr * ± 2 kg * ± 200 g * 400 g
3138_0 $45.00 Compression/Tension Load Cell 100 kg
3139_0 $7.00 Shear Load Cell 100 g ± 50 mg 50 mg 50 mg
3140_0 $50.00 Compression/Tension Load Cell 500 kg
3141_0 $50.00 Compression Load Cell 1 Mg

Strain Gauges

Strain gauges are ideal for situations where you want to monitor the strain in a material that's already a part of your project. By attaching strain gauges in a strategic way, you can effectively turn a load-bearing member into a custom load cell. You can read strain gauges using the DAQ1500 by connecting them as described in the Strain Gauge Primer.

Product Sensor Properties Electrical Properties
Image Part Number Price Sensor Type Strain Gauge Mount Type Resistance Value
3142_0 $12.50 Torque Half-bridge Strain Gauge Steel (per quarter-bridge) 1 kΩ
3143_0 $12.50 Torque Half-bridge Strain Gauge Aluminum (per quarter-bridge) 1 kΩ
3144_0 $15.00 Half-bridge Strain Gauge Steel (per quarter-bridge) 1 kΩ
3145_0 $15.00 Half-bridge Strain Gauge Aluminum (per quarter-bridge) 1 kΩ
3146_0 $17.50 Full-bridge Strain Gauge Steel (per quarter-bridge) 1 kΩ
3147_0 $17.50 Full-bridge Strain Gauge Aluminum (per quarter-bridge) 1 kΩ

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
CBL4104_0 $1.75 300 mm
CBL4105_0 $2.00 900 mm
CBL4106_0 $2.50 1.5 m


Part 1: Setup

Welcome to the DAQ1500 user guide! In order to get started, make sure you have the following hardware on hand:


Next, you will need to connect the pieces:

DAQ1500 Functional.jpeg
  1. Connect the DAQ1500 to the VINT Hub using the Phidget cable.
  2. Connect a load cell or strain gauge to the DAQ1500. See your product's data sheet for connection details.
  3. Connect the VINT Hub to your computer with a USB cable.


Now that you have everything together, let's start using the DAQ1500!

Phidget Control Panel

In order to demonstrate the functionality of the DAQ1500, 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.

Windows

To open the Phidget Control Panel on Windows, find the Ph.jpg icon in the taskbar. If it is not there, open up the start menu and search for Phidget Control Panel

Windows PhidgetTaskbar.PNG

macOS

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 Ph.jpg 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 DAQ1500.

First Look

After plugging the DAQ1500 into your computer and opening the Phidget Control Panel, you will see something like this:

DAQ1500 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.


Part 2: Using Your Phidget

About

The DAQ1500 reads two load cells, strain gauges or Wheatstone Bridge-based sensors. The Phidget reports results as a voltage ratio. To convert from voltage ratio to a quantity like weight or force, see the Calibration Guide in the Advanced Topics section.

DAQ1500 About.jpg

Explore Your Phidget Channels Using the Control Panel

You can use your Control Panel to explore your Phidget's channels.

1. Open your Control Panel, and you will find the following channels:

DAQ1500 Panel.jpg

2. Double click on a channel to open an example program. Each channel belongs to the Voltage Ratio Input channel class:

Voltage Ratio Input (Bridge Input): Read data from a load cell

In your Control Panel, double click on "Bridge Input":

DAQ1500-VoltageRatio.jpg

Part 3: Create your Program

1. Setting up your Programming Environment

2. Phidget Programming Basics

Part 4: Advanced Topics and Troubleshooting

Choosing a Gain Value

The DAQ1500 has the option to change the bridge gain, which improves measurement resolution at the cost of reducing your effective range. We recommend starting at 128x gain and testing your load cell with the maximum load you expect to see in your system. If you get any saturation error events, you should lower the gain and test again. Here are the specifications that vary with gain:

DAQ1500-gain.jpg
Connecting Your Strain Gauge or Load Cell

Load cells are pressure sensors that can be used with the DAQ1500. For more information, see our Load Cell Primer. If no documentation is available for your strain gauge, it is possible to use a multimeter to determine how to connect it, provided there are no electronics in the sensor. Measure resistance between the 4 wires. There are 6 wire combinations - two of the wire combinations will have a resistance 20-40% higher than the other four. Select one of the two high-resistance combinations, and wire it into 5V and G on the DAQ1500. Connect the other two wires into +/-. Apply a load, if the V/V responds in the opposite way to your expectations, flip the +/- wires.

Measurement Considerations

The DAQ1500 is designed to measure voltages as a ratio of the supply voltage - it is not practical to make measurements of absolute voltages with this product. For maximum accuracy, all wires from the DAQ1500 to the sensor should be the same length, thickness, and temperature (as the temperature will change the resistance of the wires). The bridge inputs can be powered down, reducing power consumption with DAQ1500 sensors. Powering down the bridge inputs is also useful for preventing the heating of sensors, which can introduce errors. Due to the drift that occurs during self-heating, we recommend you operate your DAQ1500 in one of two ways:

  • Allow a 30-minute warm-up after the channel is enabled, before taking constant measurements for an extended period. The drift, due to self-heating of the wires, will eventually stop. Once stable, you can calibrate and measure.
  • For occasional measurements, you should enable the channel, immediately take the measurement, and then disable the channel. By doing this, there is so little current moving through the wires that the device does not get a chance to heat up. You can also follow this process when calibrating.
The number I’m getting back from the DAQ1500 is really small

Load cells output a small voltage proportional to the amount of strain they are currently experiencing. The rated output for most load cells at full load is in the order of millivolts, so when you’re only straining the load cell at a fraction of its full load, you will get very small values. In order to convert to meaningful units like grams or newtons, you need to calibrate the load cell.

Calibration

For an in-depth guide on calibration, see Calibrating Analog Sensors.

Setting the Change Trigger and Data Interval

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.

How do I know what channel, serial number, or hub port to use in my program?

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:

The locate Phidget button is found in the device information box

2. The Addressing Information window will open. Here you will find all the information you need to address your Phidget in your program.

All the information you need to address your Phidget


See the Phidget22 API for your language to determine exact syntax for each property.

Product Specifications

Board
Controlled By VINT
Number of Bridge Inputs 2
Bridge Inputs
Bridge Voltage Resolution 59.6 nV/V
Sampling Interval Max 60 s/sample
Sampling Interval Min 20 ms/sample
Bridge Current Max 50 mA
Input Voltage Limit Min Ground + 0.25V DC
Input Voltage Limit Max 5V Supply - 0.25V DC
Electrical Properties
Current Consumption Min 25 μA
Current Consumption Max *bridge current plus 1.5 mA
Physical Properties
Recommended Wire Size 16 - 26 AWG
Operating Temperature Min -40 °C
Operating Temperature Max 85 °C
Customs Information
Canadian HS Export Code 8471.80.00
American HTS Import Code 8471.80.40.00
Country of Origin CN (China)

* - The extra 1.5mA of current consumption varies depending on the data interval selected. See the graph below for details.

Current

Documents

Product History

Date Board Revision Device Version Comment
June 20170104Product Release

Software Objects

Channel NameAPIChannel
Bridge Input VoltageRatioInput 0 - 1

API


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Code Samples

Language:

APIDetailLanguageOS
VoltageRatioInput Visual Studio GUI C# Windows Download
VoltageRatioInput Load Cell Calibrator C# Windows Download
VoltageRatioInput Java Android Download
VoltageRatioInput JavaScript Browser Download
VoltageRatioInput Objective-C macOS Download
VoltageRatioInput Swift macOS Download
VoltageRatioInput Swift iOS Download
VoltageRatioInput Visual Basic .NET Windows Download
VoltageRatioInput Max/MSP Multiple Download

Here are our Bridge Interfaces:

Product Board
Image Part Number Price Controlled By Number of Bridge Inputs
1046_0B $90.00 USB (Mini-USB) 4
DAQ1500_0 $30.00 VINT 2