When i first saw Jeff Han’s Multitouch introduction i was blown away. I got instantly infected by the idea to have and build such a multitouch screen… After searching the net for a while i found this community. Here i found all the relevant information on how to build one. So a *BIG HUG* goes to the whole community for sharing your knowledge and work! I finally decided to go with the DSI concept and a LCD and make it portable.
porta∼touch - portable 24” DSI - LCD MT
Benq 2410 HD LCD Panel (1920 x 1080 Pixel)
8mm Endlighten XL Plexiglas (Touch Panel Frame)
IR-Led-Ribbon 850nm with 160 Led’s
8 mm Endlighten XL Plexiglas (for the Backlight)
2 Original Backlight Tubes from the Benq 2410 HD Panel
Unibrain Fire-i Firewire Camera, 30fps, 640x480 Pixel, 81° Wide Lens
850nm Acrylic IR-Longpass-Filter
MacMini Core 2Duo 2.66 Ghz running OS X Leopard, CCV 1.2, ReacTIVision 1.4 and Quarz Composer
Fiducial (with ReacTIVision) and finger recognition (with CCV 1.2 / 5 ms response latency)
Mounted Dimensions: 75cm x 45cm x 35cm (W x D x H)
Mounting Time: 3 min. with 12 Screws, few cables
Boxed Dimensions in Flightcase: 75cm x 45cm x 15cm (W x D x H)
- 8mm Endlighten Touch Panel Frame with IR-Led-Ribbon
- Benq 24” LCD Panel
- 8mm Endlighten with Backlight Tubes on the long sides
- 3mm Plexiglas on Aluminium Frame as Mounting Surface
- Fire-i Camera mounted 30cm under Touch Panel
- The Backlight is just bright enough, but there is no overhead if i need it brighter. So maybe i add two more tubes on the sides of the Endlighten.
- The IR-Longpass Filter is not perfect. It still sees some light. I want to try a steep bandpass filter for better results.
- A HD Cam with a resolution of 1280 x 720 (Logitech Pro 9000) may give a better touch response on the sides of the screen compared to the 640 x 480 camera since it has to cover the touch range of 1920 x 1080 pixels and it’s distorted because of the wide lens.
- The screen with it’s ratio of 16:9 isn’t perfect to use and hard to calibrate with ReacTIVision. So i’m waiting for CCV with fiducial support
Being a total noob in coding i ended up with visual programming to fiddle some sort of MIDI-Controller with Quartz Composer. It is in a early alpha stage. Enough writing. Here is the result of the last weeks of work.