[Lab] Touch sensitive/reactive windows

Andrew Plumb andrew at plumb.org
Mon Mar 14 15:58:06 EDT 2011

See http://www.lessemf.com/plastic.html

Sent from my iPhone

On 2011-03-14, at 15:47, "Andrew O'Malley" <aomalley at gmail.com> wrote:

> Hi,
> Thanks for your ideas/suggestions everyone -- I'm hearing the idea of
> conductive coatings or conductive plastic a lot, anyone have any leads
> where I would acquire such things?
> Thanks again,
> ao.
> On Mon, Mar 14, 2011 at 1:32 PM, Jean-Marc LeBlanc
> <jeanmarc.leblanc at gmail.com> wrote:
>> you can also use a project like this one
>> http://www.43oh.com/2010/09/capacitive-sensing-with-the-msp430-launchpad/
>> I am not sure if it would work, but if you could use clear conductive
>> paint or a cleat conductive plastic instead of the foil.
>> Jean-Marc Le Blanc
>> ---
>> "Do you pine for the nice days of Minix-1.1, when men were men and
>> wrote their own device drivers?" Linus Torvalds
>> On Sun, Mar 13, 2011 at 2:30 PM, Andrew O'Malley <aomalley at gmail.com> wrote:
>>> Hi gang,
>>> I'm working on a an interactive light piece which is basically a large
>>> tower covered in windows:
>>> http://www.technoetc.net/imgs/urbana_2011_gameplay_2.png
>>> Each window will be translucent acrylic, and illuminated from behind.
>>> To provide interaction, I'd like each window to be touch sensitive.
>>> I'd like to use a capacitive sensing approach, but not sure if this
>>> will work until I do some experiments; I fear over such a large area
>>> capacitive sensing will be very noisy.
>>> In the meantime, I'd love to hear any suggestions anyone might have as
>>> to how to detect users touching the windows.  I'd like to avoid having
>>> to use little buttons beside each window or turning each window into a
>>> mechanical switch -- since there are 100+ windows, I'm looking for a
>>> solution that scales reasonably well.
>>> Light or IR sensors might be an option, but I imagine will require a
>>> great deal of calibration.  Does anyone have any experience sensing IR
>>> reflections through translucent or tinted acrylic?
>>> The piece is still in the design stage, so I'd love to hear your
>>> suggestions/comments.
>>> Thanks in advance for your consideration and suggestions,
>>> Andrew
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