[hackerspaces] Laser "touch" screen?

Russell Hubbard russell at vieinnovative.com
Sun Dec 18 01:21:30 CET 2011

I'vs been meaning to try that with a wrinkle whiteboard. I wonder if
there's enough bleedthrough IT on a green laser to trigger the remote. Or
you could use a red/IT combo so you point with red and click with IR.
On Dec 17, 2011 3:52 PM, "B F" <bakmthiscl at gmail.com> wrote:

> It occurred to me that we have touch screens and we have laser
> pointers, but can we combine the two concepts and have a laser pointer
> that works on a projected image from a freehand-held pointer?  I.e.,
> you could easily implement what appears to be this if working at the
> computer screen, but can it be done (easily) while standing at the
> lectern beside the projector screen?
> I figure someone has probably invented this.  But if not, then a
> simple camera specifically sensitive to the reflected red (or red+IR)
> dot could be
> coordinated with a few projected marks on the screen to initialize
> the system.  After that the camera would simply see where the pointer
> was and would respond, perhaps, to a coded strobe signal from the
> pointer to actuate
> whatever feature (URL link or whatever) was projected at that spot.
> Any feedback?
> Bruce Freeman
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