4 Replies Latest reply on Jan 25, 2015 9:15 AM by user_14586677

    Problem with self-built sensor

    wei.tan

      Hello everyone,

         

       

         

      i am using the CapSense controller of PSoC.

         

      The touching element i built can be seen in the attached file....I coated a transparent conductive layer on the substrate and then separate the layer into eight stripe elements. In the end i made a nonconductive overlayer on top of conductiving eight elements.

         

      I programmed the PSoC, assigned the pins, then connected the pins with 8 elements using alligator clamps. When i touch certain element, the corresponding LED light should be on and the LCD also shows the touching position. But it does not work as i wanted, the Capsense controller seems not able to detect the capacitance change from the finger.

         

      I  measured the resistance of each strip element (130-200 Ohm), is it because of the high resistive load that the capacitance change cant be sensed?

         

      But when i remove the alligator clamps from the touching element and i touch certain clamp, the desired effects were shown.

         

      Anyone has idea why cant the finger touch be sensored on the touching elements?

         

       

         

      Regards

         

      Sammi