DIY FTIR Multitouch - compliant surface test

This is the camera view from my prototype FTIR multitouch screen.

This is a comparison of my compliant surface (left) against the bare acrylic (right).

#ftir irc.freenode.net
http://www.nuigroup.com/

Category:

Howto & Style

Tags:

• FTIR
• multi
• touch
• multitouch

[NateTheGreat555]

So do you think that the compliant surface is actually necessary? The bare acrylic seemed to do a very nice job at tracking the blobs...

[Joobs]

@NateTheGreat555 it depends on the setup. If you are planning on having a projection screen infront of the acrylic then it is needed.

[sean6006]

I;m trying to find out whats wrong with my screen, i have 88x850nm leds 15degree cone, 60mA. I have 88leds on a 30" screen (1led/inch) but my hardmodded PS3 eyetoy is not picking up th IR light when i put my fingers in the 3/8" thick plexiglass with flamepolished edges. it can see the LEDs very brighly but not the reflected light. what can not be working?

[Joobs]

Do you need to modify the eyetoy's lens to remove the IR filter? If I point one of my LEDs at my phillips camera with a lens that has no IR coating it pretty much whites out the entire image. It can still see the LED with it's normal lens though, but its just a dot of white light and isn't strong enough to work with FTIR.

[sean6006]

I did modify the eyetoy to remove the IR filter and placed floppy disk foil to filter out the visible light, But which LEDs should I buy and what is a reasonable amount of LEDS for a 30" screen(24"x18")?

[Joobs]

go to the forums at nuigoup (dot) com, there will be people there who know more about the eyetoy camera as well as build reports detailing parts.

[nskpsycho]

i used silicon sealant (3 coats) on a piece of drafting vellum. each coat takes about 1 hour to dry. you can spread the silicon with a dense foam paint roller.

[Joobs]

It's taken me 3 days to figure out why i can't reply to you (youtube doesnt like the "hash" symbol).

I suggest you join the IRC chatroom mentioned in my description. We are in the process of setting up a multitouch community with blogs, wiki, and a forum. We will be sharing information and software with each other.

[keram81]

Hi can you please tell us what your "compliant" surface is? Do you get smeary fingers or not? Is it something like: finger on silicon, silicon on grease, grease on acrylic. (?)