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LDC3114: Inductive sensing vs resistive sensing?

Markel Robregado
Guru 86755 points
Part Number: LDC3114

Tool/software:

Hi,

I watched this youtube demo using LDC3114 for grip detection.

From the demo, force or grip is applied to the LDC3114 inductive sensor creating compression.

My first question is, would I get similar results if there is expansion from the inside? My intended application is to detect leg wound swelling.

My second question what is the advantage of using inductive sensing compared to resistive sensing? I could use a force sensitive resistor (FSR) and could get similar results.

Does inductive sensing provide more accurate sensing compared to resistive?

-kel

  • +1
    TI__Mastermind 43730 points

    Hi Kel,

    Yes, I think that this could also work for your application.  The LDC devices will change resonant frequency based on how close the metal is to the coil.  

    The main advantages over resistive sensing would be accuracy and repeatability from sensor to sensor.  To give you an idea of the accuracy and resolution we can attain with inductive sensing, have a look at the app note below where we are measuring change in the micron levels to detect the deflection of metal as a button press.

    https://www.ti.com/lit/an/snoa961a/snoa961a.pdf 

  • 0 in reply to Eddie LaCost
    Guru 86755 points

    Does TI have PCB design files for racetrack sensor 2 layer with shielded routing? From below picture I just need 1 racetrack sensor for my testing.

    Since my intended application would be to detect leg wound swelling, the sensor placement on the leg bandage would be curved. A memory foam spacer would work in this situation. I guess that the memory foam would be glued to the sensor. I will use copper tape as a conductive target.

    -kel

  • +1 in reply to Markel Robregado
    TI__Mastermind 43730 points

    Kel,

    You may be interested in the LDC Coil EVM, which provides many coils that you can test with.

    https://www.ti.com/tool/LDCCOILEVM

    To generate your own coils, you can use the Webench tool below.  This does not generate the shielded routing. You would need to implement this in your design.

    https://webench.ti.com/wb5/LDC/#/spirals