Yep, its a old overhead projector. Just got it, it has a roughly 6 foot throw distance, with a image size of around 3x3 feet. So we are still going to need a mirror, roughly 20x20 should do. That will allow for a 3 foot or so tall table.
A small LCD panel should work good. Only part of it will be visible anyways. On Apr 13, 11:25 am, Phil Smith <[email protected]> wrote: > oh duh, right. > > On Mon, Apr 13, 2009 at 10:51 AM, Ryan Reggio <[email protected]> wrote: > > > maybe I'm thinking of the wrong thing. when he said projector i had an > > image of an old over head projector, the same kind they used in school > > classrooms and such. however maybe he was talking about something > > else. if its one of those old overheads then all we need to do is set > > the lcd (after taking it apart of course) on top of it. and viola > > instant lcd projector thingy.... it should project a 15 inch screen. > > however if the lens works on anything other than a 1 to 1 ratio then > > it could be ether bigger or smaller... if its smaller then yeah wee > > need another mirror... if its bigger though were all set.if i remember > > correctly the over head projectors work by shining a light through a > > lens, you set the transparencies on the first lens. then you had the > > part that stuck up like an antennae. that part i think was made up of > > two convex lenses and one normal mirror angled at 45 degrees. if thats > > the case all we'll need to compensate for is the image being > > reversed... which could prove problematic i suppose we could just tip > > the overhead on its side after taping the lcd to the projector... that > > way its projecting vertical rather than horizontal... lol but i guess > > we'll see next saturday... > > > On Apr 13, 9:37 am, Phil Smith <[email protected]> wrote: > >> (bulb + 15'' lcd) == projector that needs a bigger mirror, or a way to > >> work without it. The ones we have are 1'x1' > > >> On Mon, Apr 13, 2009 at 9:25 AM, Ryan Reggio <[email protected]> wrote: > > >> > i have another one we can use its a desktop monitor. its not all that > >> > big but i think it will work for our purposes. i think its about 15" > >> > or so. i don't know how big the surface of the projector is. however > >> > that will limit how big the lcd screen can be as if its too big there > >> > will be space that the projector doesn't hit with light. i would think > >> > 15" or smaller would be a good place to start.having a screen that is > >> > too small is ok but if its too big.... then we start to have problems. > > >> > -Ryan > > >> > On Apr 13, 8:14 am, Crusoe <[email protected]> wrote: > >> >> Also, the other half of work involves a DLP or homebrew LCD projector. > >> >> I have a overhead projector being dropped off today. Found it for $30 > >> >> on craigslist. > > >> >> Next, we'll need another LCD monitor to take apart. > > >> >> -Daniel > > >> >> > backscatter was available for the camera to see. > > >> >> > So the next plan of attack is to either use a ir rimlight around the > >> >> > display surface, and finger touches will break the internal > >> >> > reflection, scattering light to the camera. Or mount some IR LEDs > >> >> > underneath, and use these so that finger touches cause IR backscatter. > > >> >> > I found some VERY powerful IR Leds online, 0.5-3W. I will probably > >> >> > pick up a few. > > >> >> > -Daniel > > >> >> > On Apr 9, 9:04 am, Phil Smith <[email protected]> wrote: > > >> >> > > Nice. I'll go see if I can't scrounge up a small mirror. > > >> >> > > On Wed, Apr 8, 2009 at 7:19 PM, Crusoe <[email protected]> > >> >> > > wrote: > > >> >> > > > Just got the firewire camera in. 640x480, very nice picture. > > >> >> > > > I managed to scrape off most of the IR filter, and I found some > >> >> > > > exposed color film negative to use as a visible light filter. I > >> >> > > > suspect I will need to muck with it more at Saturday house. > > >> >> > > > -Daniel > > >> >> > > > On Apr 6, 8:37 am, Crusoe <[email protected]> wrote: > >> >> > > >> So we have 2 solutions for image capture. Security cameras, and > >> >> > > >> the > >> >> > > >> firewire webcam > > >> >> > > >> RRegio: I think the Celeron box you have should be able to run > >> >> > > >> the > >> >> > > >> image processing/capture adequately. > > >> >> > > >> So all we need is the mirror. > > >> >> > > >> On Apr 5, 11:17 pm, Crusoe <[email protected]> wrote: > > >> >> > > >> > Meh, my laptop can run the software just fine. I have a > >> >> > > >> > firewire > >> >> > > >> > webcam coming in. But yeah, we can try the security cameras as > >> >> > > >> > well if > >> >> > > >> > Ryan or someone can find a capture card. > > >> >> > > >> > Also, Ryan brought along these real cool microwave-based motion > >> >> > > >> > detectors. All they need is power, and they output a signal on > >> >> > > >> > 2 wires > >> >> > > >> > when they detect motion. Someone with a voltmeter and basic > >> >> > > >> > electronic > >> >> > > >> > knowledge can probably figure it out. > > >> >> > > >> > The Dec box was powerful in it's day, but my notebook may be > >> >> > > >> > faster > >> >> > > >> > now. > > >> >> > > >> > -Daniel > > >> >> > > >> > On Apr 5, 4:19 pm, Phil Smith <[email protected]> wrote: > > >> >> > > >> > > I'm seeing a 65bit dec alpha box going by on freecycle: > >> >> > > >> > > "Working, > >> >> > > >> > > loaded with 64-Bit Windows NT(!). Floppy, CD, and Zip > >> >> > > >> > > drives. No > >> >> > > >> > > monitor, accessories or power cord." No idea how it stacks > >> >> > > >> > > up, but > >> >> > > >> > > hey, free box. > > >> >> > > >> > > On Sun, Apr 5, 2009 at 3:28 PM, [email protected] > >> >> > > >> > > <[email protected]> wrote: > > >> >> > > >> > > > so those of you who were at the meeting yesterday know we > >> >> > > >> > > > got a > >> >> > > >> > > > prototype of the reactable semi-working. so in order to > >> >> > > >> > > > actually get > >> >> > > >> > > > it working in a respectable fashion we need a few things. > >> >> > > >> > > > an > >> >> > > >> > > > appropriately sized mirror (about 15" x 15"), and a > >> >> > > >> > > > computer capable > >> >> > > >> > > > of running the software for image capture and analysis. i > >> >> > > >> > > > have a > >> >> > > >> > > > computer we can use for this purpose, however if anyone > >> >> > > >> > > > has something > >> >> > > >> > > > better (its needs to have at least one available PCI slot > >> >> > > >> > > > for the NTSC > >> >> > > >> > > > capture card) the computer i have is running win xp using > >> >> > > >> > > > a intel > >> >> > > >> > > > celeron d 3.06 ghz with 1-2 gigs of ram its a blank > >> >> > > >> > > > machine so it'll > >> >> > > >> > > > run pretty quick however we may need a bit more juice than > >> >> > > >> > > > that. so if > >> >> > > >> > > > anyone can bring something better i can just slot the > >> >> > > >> > > > capture card > >> >> > > >> > > > into it. any help will be appreciated. > > >> >> > > >> > > > -Ryan --~--~---------~--~----~------------~-------~--~----~ Website: http://saturdayhouse.org/ Post: [email protected] Unsubscribe: [email protected] -~----------~----~----~----~------~----~------~--~---
