8 Replies Latest reply on Jun 24, 2014 6:32 AM by user_14586677

    ADC_DelSig_v3_09   and AmuxHw_v1_50

    user_301665782

      Hi there !!!!!

         

       

         

      I woluld need again your help!

         

      I am triyng to read on display module four FSR ( force sensing resistor) and  they look lik NTC thermistor in relation to resistance  versus physic exitation. In this case  exitation is a finger tip touch.

         

      I have multiplexed them to a ADC_DelSig_v3_09 and I have used harward multiplexer.

         

      I have atacched a bunddled zip with the proyect.

         

      The TIA has an output of vdd/2 when any FSR is pressed, and  vout can reach 0 V  depending on the strenght of the touch can be.

         

      So the input range of my ADC is 3.3 V/2  to 0v.

         

      The result is the four redout are  0x00008104 always , which it seems to be correct when any FSR is pressed.

         

      But it does not work when I press any of the FSR.

         

      I would apreciate any help

         

      Thank you very much.