Wearable computer


9 posts
by denyingbelial » Wed Aug 01, 2012 4:09 pm
So since it's been proven that the Pi works well on a battery pack, I'm thinking of delving into wearable computing. I think a proper lens (or stacked lenses, reading glasses perhaps?) to reduce eye strain, with http://www.adafruit.com/products/910 should make a good monocle HMD. Mixed with a chorded keyboard or a miniature keyboard with touchpad, and a gutted webcam on the back of the HMD, it should make for a functional computer that, when necessary, lets you see through that eye. Remove the IR filter of the webcam and wire up some IR LEDs or make an IR LED torch and you'd have added nightvision. Hell, with a bit of kludging and a pair of cheap binoculars, you could have magnified vision too. Just a few crazy ideas. So how feasible is this? Any one else explored the pi as a wearable computer solution?
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by Anthrakia » Wed Sep 12, 2012 3:41 am
I ordered my Raspberry Pi with precisely this purpose. Once it comes in, I plan on outfitting it with a battery pack (I'll probably have to cannibalise a micro USB phone charger for this), a small monitor like the one you linked to (or maybe one a bit larger: http://www.adafruit.com/products/912 ), and an input device of my own design using some of the GPIOs (or perhaps a ring mouse).

The webcam idea is fantastic though! I would love to be able to have night-vision for cheap. Perhaps something like this? http://www.dhgate.com/mini-130w-ultra-h ... 24658.html
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by toxibunny » Wed Sep 12, 2012 4:30 am
note: I may or may not know what I'm talking about...
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by denyingbelial » Thu Sep 13, 2012 4:59 pm
I can't see the video right now because I'm at work, but I hadn't quite looked at the display and just noticed now (after ordering it) that the display's resolution is quite low (160x240). So I might not be able to work the webcam into it, but I'm gonna keep at it and report back with what I manage to do :) So that's a mini caveat - small displays have pretty low resolution. On that note, anybody know of a hack on, for instance, iPhone lcd replacements to make them work with RCA or HDMI?
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by Anthrakia » Fri Sep 14, 2012 5:56 am
I've been looking for phone-esque screens online, but I haven't had much luck. Most tiny screens are of the cheap, low res variety.
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by Johnny002 » Sat Sep 15, 2012 1:59 pm
There was something like this developed from MIT that used a portable projector and camera and all that was needed for the system in addition to that was a computing device like a phone - maybe use the Raspberry Pi? It's called the Sixth Sense and was made in 2009. http://www.ted.com/talks/pranav_mistry_ ... ology.html
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by Lob0426 » Sat Sep 15, 2012 2:33 pm
Even though this is years old it might still have some good information for you to get out of it.
http://www.media.mit.edu/wearables/mithril/
They discuss using a chorded keyboard also. There are some other options for head mounted displays out there. There was a media headset that plugged into iPods and other portable players. They were still available on ebay a while back.
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by Lob0426 » Sat Sep 15, 2012 5:25 pm
Look for MuVee or MyVu crystal display.
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by conundrum » Sat Sep 22, 2012 1:14 pm
I have two non working ones here, seems that the flexi connector on the LCD panel set tends to degrade if used a lot so if you have one put a drop of Epoxy on the panel side before going a-tinkering :-)

At some point I will make a replacement board which interfaces the PCB with the bare display, so that the defunct cable is bypassed.
When it was working the display was great, unfortunately this didn't last long once the eyepiece was opened up to do 3D hacks etc.

The display datasheet is online, if you encounter a broken unit.
Usually its one side causing the problem so you can easily hack it into submission by adding the LED from the "bad" side in series with the remaining one.
Doubles brightness too!

Another useful tip if you have a few dead camcorders is to "harvest" a panel from an old Canon or JVC unit and then make a simple VGA to RGB converter.
These displays typically use the 6 pin RGB (differential) and two syncs plus a Vcom of -9 to -18V and a 3.3 or 5V Vcc, some also use a CLK signal pair which is the dot clock.
Monochrome ones also work if you phase shift the backlight using RGB LEDs harvested from a dead PSC scan head.


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