Inductive Sensing GUI User’s Guide
3.11.3
Data Logging
Measured data from the LDC131x/161x EVM can be saved to a text file by using the logging features,
which are located on the bottom of the main GUI window.
Figure 19. Data Logging
The data is saved in a comma separated text file which contains the time of data capture, the inductance
measurement, and the raw inductance data. Data can be logged either as a single measurement or as a
continuous stream of data. To save a single measurement, set the middle button to "Single". If a
continuous log is desired, change the setting to "Continuous". Once the mode is set, press the "Log Data"
button to save the file. A file save dialogue will open asking for the file name. It is recommended to add
".txt" to the end of the filename if a text editor is to be used to analyze the data, or use an extension of
".csv" if a spreadsheet program is to be used. When the Logging save mode is continuous, the GUI will
continuously save the data from the LDC131x/161x EVM. To stop the data saving, press the "Log Data"
button a second time.
3.12 Input Clock Options
By default, the input clock for LDC131x/161x is generated externally by PLL clock synchronizer and has a
value of 40 MHz. It is possible to remove R11 and connect an external clock by populating J2.
3.13 Using Multiple EVMs Simultaneously
To connect multiple EVMs to a single host, multiple instances of the GUI should be launched. Each EVM
will interface to only one instance of the GUI. Use the following procedure to setup multiple EVMs:
1. Connect the desired number of EVMs to the available USB ports.
2. Open one instance of the GUI; note the COM port number at the top of the GUI. This EVM is the
highest priority. Remove and replace each EVM individually until the COM port number changes. Note
the new COM port number.
3. This EVM is the next highest priority. Repeat this process until no EVMs are connected and the EVM
with the lowest priority have been identified.
4. When all of the EVMs are to be used simultaneously, open one GUI for each EVM and plug in the
EVMs from lowest priority to highest priority – each will claim their own instance of GUI.
15
SNOU133 – December 2014
LDC131x and LDC161x EVM User’s Guide
Copyright © 2014, Texas Instruments Incorporated
