4 Replies Latest reply on Nov 22, 2017 9:23 AM by anytimeamazonapp_2941196

    Capacitive smart surface questions

    marius.ursu

      Hi,

         

      I am building a device that allows objects to be recognized on a smart surface. We decided to stick with capacitive sensing.
      See this for an example: https://www.tiggly.com/
      The final design will be a modified version of the Magic Trackpad. https://www.ifixit.com/Teardown/Magic+Trackpad+Teardown/3395
      It consists of a few blocks:
      Sensor for Touch (10", 10 points) -> Controller -> Raspberrypi(outputs processed data - OBJ_ID at (X,Y) )+BT -> Tablet-> Application

         

       

         

      I have a few questions:

         

      -Is it realistic finish integrating the Controller and Digitizer into a working prototype in 1-2 months? I am a bachelor electronic engineering student
      There is an option of buying a development kit with a screen or ready products but this is not really designing. Even with this option there is a lot of work to be done still, so i am worried about the timeline.
      devkit: http://nl.farnell.com/microchip/dv102013/dev-brd-mtch6303-capacitive-multi/dp/2500452
      example of controller: http://www.farnell.com/datasheets/1948343.pdf
      example of Digitizer: http://www.ebay.de/itm/DIGITIZER-iPad-2-SCHWARZ-Touchscreen-Front-Glas-Touch-Frontscheibe-Display-LCD-/131588373975?hash=item1ea3473dd7:g:XmEAAOSwp5JWXK8R

         

      -Do you know of Capacitive Touch controllers that are able to process Z-axis data/proximity/hover as well, and output a diameter of the touch or distance from the surface? I need this in order to differentiate between merely taking your hand off the object, and taking the object off the surface. Other ways of sensing this difference are welcome.

         

      I am waiting for the Cypress datasheets. I was considering this one: http://www.cypress.com/documentation/development-kitsboards/cy3295-mtk-truetouch-manufacturing-test-kit?source=search&keywords=truetouch&cat=software_tools

         

      - I am having difficulties with finding capacitive digitizer manufacturers that have them readily available at a good price:
      http://nl.rs-online.com/web/p/touch-screen-sensors/7496849/ vs http://www.ebay.de/itm/DIGITIZER-iPad-2-SCHWARZ-Touchscreen-Front-Glas-Touch-Frontscheibe-Display-LCD-/131588373975
      Where should i seek these screens? I found 3M, AMT, DMC but they are a lot more expensive than digitizers.