I almost forgot to mention the LED light problem I was having. I decided that they were probably going bad because I was overpowering them. (Yeah, according to their specs I wasn't, but maybe the specs were wrong.)
So I've removed the 1ohm resistors I was using and have gone with some 22ohm resistors instead. This means I'm probably under powering them significantly and not getting nearly as much light as I could be, but it should hopefully be enough.
Unfortunately, I'm down to one spare LED light now. (Well, two if you count the one that works but had the connecting wire broken off at the base.) So if any more LEDs go bad then I guess I will either need to try to get in touch with the original buyer so I can keep using the same LEDs, or order the suggested quality LEDs that the NUI Group usually recommends. (I'm hoping for no more problems!)
Saturday, August 23, 2008
Wiring finished
So I've been lazy and haven't done much to the table in a while. I did finish all of the wiring and have all of the LEDs turning on at once though. I managed to do a bit of testing and see that I am getting good blobs of IR showing up with the camera.
I cut down part of a floppy disk to add as the filter on the camera and it seems to work okay. I had an issue that when I had the filter on I wasn't seeing the blobs brightly enough. This was most likely due to the fact that I had the Rosco Grey projection material underneath the acrylic. I had read that the Rosco Grey acts like a bit of an IR filter but was hoping that it would still work fine. Guess not. I've moved the Rosco Grey to the top of the acrylic but haven't re-tested the performance yet.
If all this works then I will need to calibrate the detection software, put legs on the table, mount the camera, and mount the projector. (Discovering the right table top height and angle for use with the projector will be the tricky part, assuming the projector at work that I will be using will even work for this..)
The top is still pretty ugly and needs something to cover the guts of it. With the Rosco Grey on top I will need to do something to make sure it stays tightly stretched over the acrylic as well, so hopefully I can kill two birds with one stone.
With the Rosco Grey on top I think I will also look into creating a compliant surface material out of some liquid latex. (Makes the IR blobs show up better without requiring as much force to be applied to the table, makes blobs show up better when dragging your finger, and some other benefits.
So there is still alot to do.
I cut down part of a floppy disk to add as the filter on the camera and it seems to work okay. I had an issue that when I had the filter on I wasn't seeing the blobs brightly enough. This was most likely due to the fact that I had the Rosco Grey projection material underneath the acrylic. I had read that the Rosco Grey acts like a bit of an IR filter but was hoping that it would still work fine. Guess not. I've moved the Rosco Grey to the top of the acrylic but haven't re-tested the performance yet.
If all this works then I will need to calibrate the detection software, put legs on the table, mount the camera, and mount the projector. (Discovering the right table top height and angle for use with the projector will be the tricky part, assuming the projector at work that I will be using will even work for this..)
The top is still pretty ugly and needs something to cover the guts of it. With the Rosco Grey on top I will need to do something to make sure it stays tightly stretched over the acrylic as well, so hopefully I can kill two birds with one stone.
With the Rosco Grey on top I think I will also look into creating a compliant surface material out of some liquid latex. (Makes the IR blobs show up better without requiring as much force to be applied to the table, makes blobs show up better when dragging your finger, and some other benefits.
So there is still alot to do.
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