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I'm new in electronics and i want to develop a resistive matrix that is pressure sensitive. Right now, I have a 7x7 matrix and I'm implementing this using multiplexers, a reference resistor and an Arduino. The Figure below demonstrates what I have done by using pressure sensitive cells.

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This solution is working fine but now, I want to implement a Voltage Feedback Circuit (VFC) to reduce the crosstalk between the pressure sensitive cells. Basically, VFC consists of applying to the unselected cells, the feedback voltage in order to get voltage drops of 0. And this needs to be done dinamically because the row and column that it is being written is also changing. In order to implement this, do I need to add more multiplexers? The figure below represents what I want to implement.

enter image description here

WilsonMCS
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1 Answers1

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Just put diodes in series with each resistor like this: -

enter image description here

Now, there can be no cross-talk.

Andy aka
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  • Thanks for your reply. As my matrix is a flexible one, I don't want to add diodes to it. – WilsonMCS Jun 11 '21 at 14:22
  • Well, your proposal doesn't look like it will work so, you either plod on trying to make it work until you abandon the idea and live with the cross-talk or fit diodes. – Andy aka Jun 11 '21 at 14:27