Is there a way to get accurate measurement in my pressure sensing matrix ?

Discussion in 'The Projects Forum' started by Ultravioletta, Mar 27, 2017.

  1. Ultravioletta

    Thread Starter New Member

    Feb 17, 2017
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    Description: The attached file illustrates a sensor matrix built by Sensitronics. I'm working on a pressure mat and my approach is pretty much the same. Current is injected through the bottem layer strips one by one and then you read the voltage across R1 parting from the upper layer "reading rows" one by one. I don't know if you get the picture, I'd be happy to provide more details if necessary.

    Question: My problem is that the voltage measured for a certain cell (located at the intersection of row i with column j ) depends not on Rij but also on the resistance across all the cells from the same column. This induces errors (up to 80 %). I'm still trying to figure out a way to do it ? if there is any.

    ps:

    I'm using registers to illiminate ghosting.

     
  2. ericgibbs

    Moderator

    Jan 29, 2010
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  3. John P

    AAC Fanatic!

    Oct 14, 2008
    1,743
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    Yes, it's possible to do this, but it takes a certain amount of hardware. Do you need this enough to build a circuit to make it more accurate?

    That stuff about keyboards and a diode at each crosspoint is a complete waste of time.
     
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