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I think the screen is backlit with a projector and is not an LCD. The side LED must be a different color of light (IR probably, most likely pulsed) and the backscatter is measured with a camera located back where the projector is. Which means it really IS scalable to very large installations... just...
by dr_leviathan
12 Feb 2006, 16:56
 
Forum: News about FingerWorks
Topic: is this it?
Replies: 3
Views: 2491

Nope, just another iPod. One that plays video.
by dr_leviathan
13 Oct 2005, 03:06
 
Forum: News about FingerWorks
Topic: Apple's next new thing announcement Tomorrow
Replies: 9
Views: 4507

I started a FW technology speculation thread here.
by dr_leviathan
10 Aug 2005, 14:40
 
Forum: Keyboards: TouchStream, MacNTouch, Digitouch, Mini
Topic: Sensor chips
Replies: 1
Views: 1671

My first guess (and this is just a guess) is that you've got a bad connection in the USB connector, or damage to the cord that comes out of your keyboard (mabye it got kinked or smashed by something?). Examine the USB connector and cord for signs of damage. Try stressing the USB connector/cord eithe...
by dr_leviathan
10 Aug 2005, 14:37
 
Forum: Keyboards: TouchStream, MacNTouch, Digitouch, Mini
Topic: Keyboard dead!
Replies: 1
Views: 1636

Looking for a broken FW board

I'm looking for a non-functional FW keyboard or mouse tablet (any model, any condition). I want to dismantle it so I can examine its construction. If anyone has one still hanging out that they would like to part with then let me know. You can put it up on e-bay for me to bid on, or you can just tell...
by dr_leviathan
08 Aug 2005, 23:31
 
Forum: Marketplace
Topic: Looking for a broken FW board
Replies: 0
Views: 1039

I actually read a reveiw of the Mighty Mouse. It is not "touch sensitive" at all... it has real click-buttons hidden inside. When you press down the outer shell actually depresses.
by dr_leviathan
03 Aug 2005, 13:47
 
Forum: News about FingerWorks
Topic: Apple? this sure seems like the multitouch technology
Replies: 8
Views: 3779

The FW touch sensors are capacitive and contact sensitive, not pressure sensitive. It seems the Mac mouse has squeeze and pressure sensitivity so I would guess that they are using different techniques.
by dr_leviathan
03 Aug 2005, 06:50
 
Forum: News about FingerWorks
Topic: Apple? this sure seems like the multitouch technology
Replies: 8
Views: 3779

Rqyteqto, the estimates are for making a batch of 10 keyboards, and only for the components (not labor or taxes). Of course, prices go way down when buying components in bulk, and even further down when custom IC chips are manufactured for a specific gadget. I was trying to keep the estimate in the ...
by dr_leviathan
02 Aug 2005, 19:03
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

frenchghost posted a link to Wayne's PhD thesis up above which gives a good overview of the challenges involved in making a TS keyboard. Yes, it looks like a lot of work. The sensors do indeed measure capacitance to detect proximity of the fingers, that is clear from the thesis. Yesterday while driv...
by dr_leviathan
02 Aug 2005, 17:07
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

I did some research into electrical components that might be used to build a TSclone and then came up with an estimate of what they would cost. This is a per/keyboard cost assuming that you're building about 10 keyboards in the end. I'mnot including the cost of tools such as solder iron, AVR microco...
by dr_leviathan
01 Aug 2005, 18:37
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

You may be correct lostlogic. The software that interprets the gestures is probably pretty complicated. I haven't bothered speculating about the software because writing software is actually my primary strength and the project just seemed "doable" to me. I'm probably underestimating the work necessa...
by dr_leviathan
29 Jul 2005, 22:12
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

bought a TS for my fingers

In late 2003 I injured my hands typing too much. It wasn't a gradual deterioration but a sudden type type tippety type OUCH! It was probably related to some difficult screwdriver work I had done right before the frantic typing to meet a deadline. My prefered ergonomics was probably not helping (keyb...
by dr_leviathan
29 Jul 2005, 20:16
 
Forum: Members' introductions
Topic: bought a TS for my fingers
Replies: 0
Views: 1686

I haven't done any work with piezo-electro materials, but as I think they measure pressure transitions rather than pressure. That is, they detect vibrations and sudden squeezes, but if you compress them with a steady force the signal vanishes. So for sounds and taps they might work, but they wouldn'...
by dr_leviathan
29 Jul 2005, 19:58
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

Thanks for the link ivanw. I had a few ideas on the way home yesterday. The first one is obvious after reading that article where an early prototype keyboard had a paper surface. (1) There are no metal painted on the backside of the TS plastic -- they're just on the printed circuit board (PCB) and t...
by dr_leviathan
29 Jul 2005, 17:02
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

Yes. It is an array of high impedance open-end capacitors each connected to a very low bias-current amplifier. The plastic film is probably semi-conductive and the touch of the fingers provides the pico-amps necessary to give a nice healthy signal at the amplifier. Not hard to do in a simple version...
by dr_leviathan
29 Jul 2005, 03:52
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

Yes, thank you. That is what I was looking for. Very interesting.
by dr_leviathan
29 Jul 2005, 01:09
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

Good point that touch screens can only handle one touch.; The touch sensor technology is an interesting puzzle. I've already come up with several ideas, but don't know which would be the lowest power. When you have high-impedance transducers it is pretty easy to detect contact with something like a ...
by dr_leviathan
28 Jul 2005, 17:38
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

touch sensor technology

I discovered today that I can't buy a new Touch Stream LP. After panicking and looking all over for a retailer that still has one I was eventually turned on to this site. Since I can't buy a new one I'm pondering the possibility of building one. It certainly isn't likely based on the amount of free ...
by dr_leviathan
27 Jul 2005, 23:53
 
Forum: News about FingerWorks
Topic: touch sensor technology
Replies: 31
Views: 15296

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