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Review Blogs Elegant and Robust Capacitive Touch Interfaces - Part 1
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  • Author Author: Workshopshed
  • Date Created: 10 Jul 2016 8:32 AM Date Created
  • Views 732 views
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  • Comments 4 comments
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  • capacitive sensing

Elegant and Robust Capacitive Touch Interfaces - Part 1

Workshopshed
Workshopshed
10 Jul 2016

MSP CapTIvateTm MCU Development Kit from TI

 

First impressions of this kit is that it exudes quality. A sturdy cardboard box is lined with high quality foam inserts. Each of the boards is wrapped in an anti-static bag, there are 6 in total. The boards are high quality too with small rubber feet, high spec connectors and a gloss black finish that would not be out of place on a top end stereo.

image

 

The boards in the kit are: the main MCU board, a programming adaptor, isolation board and three different sensor boards. These sensor boards are made from 2 PCBs sandwiched together. I've yet to determine if this is a requirement or just because TI wanted to provide a more robust test platform. The final part of the kit is a micro-USB cable.

 

{gallery} CapTIvate Boards

image

MCU: The microcontroller board is mostly jumpers and a few discretes so designing with this should be straight forward

image

Programmer: The programmer acts as a "HID" or Human Interaction device, this should remove the need for drivers on the PC

image

Isolator: Ensure your circuit is electrically isolated for noise measurements

image

Buttons and sliders: Linear and rotary sliders as well as 8 buttons, the design UI helps you set these up.

image

Phone: A real world example in the form of a big desk phone.

image

Proximity: A proximity and swiping demo

The documentation is online and includes full schematics and PCB designs are available, as are all the code examples.

To use the kit a PC/Mac is required along with the CapTIvateTm Design Center GUI. To reprogramme the MCU a development environment is required, this software is all free to download.

 

http://www.ti.com/tool/msp-capt-fr2633

 

This was just a quick intro, the next part of the roadtest will be to look at the software and demos, then I plan to look at use with gloves and a variety of overlay materials.

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Top Comments

  • DAB
    DAB over 9 years ago in reply to Workshopshed +1
    Sure, get two old film canisters. Put distilled water in one and take a measurement. Then put tap water or sea water in the other to see how the readings change. If my theory is correct, you might be able…
  • Workshopshed
    Workshopshed over 9 years ago in reply to DAB +1
    There does seem to be some prior research on this, will see what have time for once I've done my planned items. http://maxwellsci.com/print/rjaset/v3-53-60.pdf
  • Workshopshed
    Workshopshed over 9 years ago in reply to DAB

    There does seem to be some prior research on this, will see what have time for once I've done my planned items.

    http://maxwellsci.com/print/rjaset/v3-53-60.pdf

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  • DAB
    DAB over 9 years ago in reply to Workshopshed

    Sure, get two old film canisters.

    Put distilled water in one and take a measurement.

    Then put tap water or sea water in the other to see how the readings change.

     

    If my theory is correct, you might be able to detect the amount of impurity, at least from a permeability level are in a water sample.

     

    If so, this simple test could be easy to do a quick water quality check for people with questionable water sources.

     

    DAB

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  • Workshopshed
    Workshopshed over 9 years ago in reply to DAB

    @dab do you have a simple experiment that would answer your question?

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  • DAB
    DAB over 9 years ago

    Good start Andy,

     

    I was curious as to how well the sense circuit/software could measure different permeability of materials dissolved in water, like salt.

     

    So I will be following these road tests with interest to see what you all discover about these boards.

     

    DAB

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