LVDT vs. Pressure Data Acquisition and Graph with DAQmx

[David_Pratt]

Overview

This code completes the task of sampling LVDT and pressure data simultaneously on the same board.

Description

Because LVDT sensors can provide a voltage which represents a linear displacement, the use of seeing how this displacement correlates with the applied pressure can be very useful. This program takes the sampled data and provides them in a well suited graph to show the relationship between displacement and pressure.

Requirements

Software

• LabVIEW 2009 or compatible
• DAQmx 8.9.5 or compatible

Hardware

• Most NI DAQ hardware with analog input.  Most likely will require signal conditioning for LVDT and pressure signals
• LVDT sensor
• Pressure transducer
  

Steps to Implement or Execute Code

1. Open the VI

2. Select the individual AI channel for your LVDT sensor and your pressure channel.

3. Provide the timing parameters for your application.

4. Provide the LVDT parameters for your application.

5. Run the VI.

Additional Information or References

Notice this XY Graph appends previously sampled data with new data. For this reason there is a constant build up of data for the graph which can lead LabVIEW to run out of memory. To prevent this a boolean has been integrated to clear the graph's history. Use this periodically to prevent LabVIEW from running out of memory. Logic to automatically clear the graph after a duration of time can easily be added to the program

.**This document has been updated to meet the current required format for the NI Code Exchange.**