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Topic: Touch sensitive windows (Read 1 time) previous topic - next topic

Jeremy

I saw a project once where they used acrylic sheets with touch-- they had a camera on the back side with the IR filter removed. Fingerprints on the outside showed up as hot spots on the inside. Just something else to consider. Wii-motes have IR cameras in them and are bluetooth enabled... I bet you could point one at each side of the building, from the inside. (from there, I don't know what you'd do with it though!)

There's also a project with Wii-motes where a guy wrote software to convert IR points from the Wii-mote camera into gestures on a screen. The initial calibration tells the software where your "screen" is in relation to what the Wii-mote can see.

Jeremy

fkeel


yeah, of course. wasnt thinking right. if you use a defuse surface, you can use use an IR camera and computer vision for detecting the touches.

for the softwareside, you could try community core vision: http://nuicode.com/projects/tbeta
if your working with processing, the jmyron (i think thats what it was called) library has worked well for me.

for the ir cams, just get yourself some regular webcams, open them up, take out the visible filter, replace it with developed unexposed film (i.e. a black dia, or something like that --> ask in your lokal photo store, they will know what you need.) (alternatly, use black trash bags, they sometimes work.) and tada. ir cam.

cheers

p.

ao

Hi all, an update on this touch-sensitive windows project . . .

I ended up using the CapSense library for Arduino with a row/column electrode arrangement, thus only needing 11+1 i/o pins for each 5x6 array of windows.  Thin wire was used for the electrodes, with a row/column intersection centered on the back of each window.  Despite some noise/interference problems (mostly solved w/ grounding), this solution worked pretty well.

Each window was individually illuminated by a Shiftbrite, and the whole thing assembled in a fabricated steel structure.

I've written a detailed post about the (on-going) project here:
http://technoetc.net/blog/2011/04/27/urbana-2011/

Thanks again for your input and suggestions,
ao.

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