A cheaper way to sense position is the scanners used in store checkout systems. There is an octagon shape mirror that spins and a laster is aimed at the mirror. Then you need an IR photodiode. It's cheaper because you can use a one-pixel sensor.
On Sat, Dec 1, 2018 at 9:44 AM Gene Heskett <[email protected]> wrote: > On Saturday 01 December 2018 10:17:29 Roland Jollivet wrote: > > > I've been thinking about how to implement a touch screen of sorts on a > > 19" monitor. The TFT displays are too expensive for their size. > > > > Then I came across this; > > https://www.youtube.com/watch?v=2aOYc_GKTHQ > > > > Very interesting, and with more scanners and LED's it could be very > > usable! Next is to explore how easy it is to drive them.. > > > With the ccd bars from a fairly modern scanner, you would have both in a > unit but working with white light, not ir, and since both are in the > same bar, one could theoreticly multiplex them for even better accuracy. > But even the bars out of my brother mfc-j6920dw, would only give you 11" > of active area, and I'm sure the white light would be a distraction in > use, so one would have to make 2 bars of ir emitters, which could be > made longer increasing the size of the working field at the expense of > poor accuracy in the corners. 2 ccd bars end to end would solve that, > giving 22" or more of scanable area vertically. How much $ would you > have in getting those parts from brother? > > > -- > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
