Touchscreen Progress
I started working on a IR pen input device (pictured on the left) using a pen, a momentary switch from radio shack, an LED and a watch battery. I still need to find a way to mount the battery, but otherwise it seems to work. It lights up in IR when you press down.
I also started thinking about converting Irrlicht's GUI code to work with multiple inputs and I think I have an idea on how to do it that shouldn't require too many changes or break it for non-multitouch appliactions. It will be kind of nice getting this working, since then I'll have a complete GUI system (with buttons, dropdowns, windows, etc) that is multitouch friendly.
I am also going to think about how the screen can be made even more sensitive and user friendly. Dragging operations are still a bit difficult since when your finger starts moving, the FTIR spot tends to get less bright. Fixing may take a combination of getting better quality images and more predictive blob tracking.
5 Comments:
Hi david, have been watching this log since a few weeks. Last week i started building my own surface and it works good now. But, i have the same problem with dragging operations. I noticed when i make the surface a little wet, dragging operations are excellent.
I wondered if there isn't a surface that i can lay on the acrylic that has the same properties as the thin layer of water?
Chris (From the Netherlands)
Hi Chris,
I also wonder if different types of acrylic might work better. BTW, funny you should mention water - futnuh discussed the possibility of making a screen which is also a fountain (ie, has running water going down it's surface.
I think this is another reason why finding a good compliant surface is a good idea.
Let me know if you think of anything. ;)
i stuck a sheet of tracing paper between two sheets , and put the ir on the top , seems to work as lone as there is no moisture from what i have seen
At the moment i am using a simple layer of kitchen oil instead of water. It holds a few days and is even better with tracing than using water. The negative thing is ofcourse a little bit of the oil stays on the fingers.
Btw, i'm thinking in advance of maybe using a rfid tracking table:
http://www.jamespatten.com/audiopad/
downside is it's very hard to make i think.
Chris
I thought about doing something like that. Maybe there is some other kind of lubricant that works well.
You might want to think about making some kind of compliant surface - that way the surface makes contact with the oil or whatever, not your fingers.
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