|July 24, 2010||Tagged Cyborg, Martin|
Here's a more obvious way to wear a wearable computer:
I bought a cheap CD case, ripped out the interior CD pockets, and glued Velcro straps on the interior surface. Adhesive Velcro on the back side of the gadgets make for a configurable layout:
The case conveniently opens like a book for easy access to the components. Zipped close it becomes a compact bag that protects the interior:
Attaching a shoulder strap results in a relatively discrete wearable computer:
|July 23, 2010||Tagged Cyborg, Martin|
How do you wear a wearable computer? Here's one idea:
Each component is attached to a leather shoulder belt using Velcro. If the cables were tidied up, it might be practical, but it sure ain't subtle :)
The components are:
Here's the system laid out on a table:
|July 19, 2010||Tagged Cyborg|
The Beagleboard is just an unprotected circuit board. I built the simplest possible case from a square piece of Plexiglas with four drill holes:
It was difficult to find spacer bolts of the right dimensions. Finally I cut my own from some nylon wall plugs:
Four 20mm M3 bolts are held in place by nuts on the back of the Beagleboard:
|July 17, 2010||Tagged Cyborg|
A mobile system must be battery powered. I'd heard that the Beagleboard can be run on four regular AA batteries. My 1.2 volt batteries actually produced 5.4 volts when fully charged. I added a diode on the power cord to be on theBeagleboard's 4.8-5.2 volt safe side:
The Myvu Crystal display has a controller unit with a built-in 4h battery. It is supposed to run indefinitely while powered through the mini-USB port. But, for some reason, my unit still shut down after some time. I opened the controller and removed the battery:
I then cut the USB cable to get at the power cords:
This replaces the controller's battery with direct power from the USB cable:
Finally, I wanted to add a bluetooth adapter to the Beagleboard. Unfortunately it must be connected through an USB hub. This seems somewhat wasteful in terms of space and power consumption, but my attempts to bypass a hub by using the USB OTG port in host mode failed. Despite this, the Beagleboard, USB hub, bluetooth adapter, and MyvuCrystal display ran for a respectable 3h on my four 2700mAhbatteries. Presumably you could add multiple battery packs in parallel to get an entire day of usage since each battery weighs only 30g.
|July 16, 2010||Tagged Cyborg|
The Beagleboard comes with an S-video port. Ipreviously wrote about configuring it for composite video. I connected the display through an S-video to RCA and a double-male RCA adapter:
This connector is unwieldy to say the least. In fact, it's as wide as theBeagleboard itself! Using a multimeter I figured out how to solder a regular RCAconnector directly onto the board. You can see where the connections go in this image, including the shorting of two soldering points using a staple:
The other end connects to the Myvu Crystal controller and the glasses. Since I'm building a monocular, I pried open the glasses' connector hoping that the second cable would be easy to remove:
The cable seems to be covered in silicone, making it hard to remove. Wire cutters to the rescue:
|July 14, 2010||Tagged Cyborg|
One 10cm piece of 1.5mm iron wire is fastened to the glasses' frames by screws through a piece of Plexiglas. The other end is simply attached to the display with electric tape:
The mount is light weight yet surprisingly stable. Most importantly, the viewing angle is easily adjusted using a pair of pliers:
It is apparently still possible to use the phone without the display getting in the way:
|July 12, 2010||Tagged Cyborg|
I bought a goose neck USB light. This is what it looked like after five minutes in my ownership:
A piece of Plexiglas was epoxied onto the neck and screwed onto the glasses' frames:
The idea was to mount the display on the flexible neck so that it could be easily adjusted to the right viewing angle:
This worked, to a degree. But the goose neck could not be bent at any angle, so adjustment was still difficult. And the mount's weight made the glasses uncomfortable to wear.
|July 11, 2010||Tagged Cyborg|
I came up with an idea for a very simple display mount to replace the more complex hinge. I cut a piece of the thick plastic from a credit card and bent it to the right shape. It looks like this after spray painting it black:
There is some space between the glasses' frames and lenses where the bent plastic fits. The display is attached to the credit card by electric tape:
However, once again, the viewing angle of the display was imperfect:
The bent plastic did not hold its shape. Any attempts to adjust the angle were futile. Now it's back to the drawing board to think up more ideas.
|July 05, 2010||Tagged Cyborg|
My Vuzix Wrap 920 display was mounted in the right peripheral view. This provided access to the screen while still allowing me to safely navigate physical reality. But reading a tiny screen in the corner of your vision caused too much eye muscle strain.
Thus I wanted to mount the Myvu Crystal display on an adjustable hinge. You'd catch quick glances of the screen by looking down. Flipping the display up would put it in the center of your right eye view for extended reading and writing.
This is what I came up with:
The mount is made from Plexiglas. I cut it using a metal saw and shaped the bend after heating it over a candle. A second piece of Plexiglas creates a hinge and is fastened to the glasses' frame with screws:
Finally, the display unit is simply attached with some clear tape:
It looks neat, in my opinion, but unfortunately doesn't work very well. The eye needs to have a perfect viewing angle into the magnifying glass in front of the micro display. Otherwise parts of the screen very easily become fuzzy or completely obscured. The angle of the mount was difficult to get right, and impossible to adjust while attached to the glasses without risking burning the whole thing over the candle.
I'll probably have to try something simpler next.
|July 02, 2010||Tagged Cyborg|
The Myvu Crystal video glasses look really promising as the head-mounted display unit. They're all sold out, but I managed to buy a refurbished pair from E-bay:
After making sure they work, I attacked them with a screw driver. Surprisingly,there wasn't a single screw to be found inside. But the screw driver came in handy for prying off the top cover:
The bottom cover then comes off easily:
The frame hides an ugly solid rubber blob where the head phone cable joins the video cable. I have yet to muster the courage to cut through it:
A plastic frame covers the front of the display unit:
Oops. The micro display came off while I was trying to get the magnifying lens out of its socket. I'm not sure whether it's possible to get the whole unit out in one piece:
Finally the magnifying lens came loose. It required a lot of force. I think the mirror on the slanted edge of the back of the lens got stuck. Maybe less force would have sufficed if I had realized that sooner:
Reattaching the micro display using electric tape results in an impressively tiny display unit. Here's a size comparison with my modified Vuzix Wrap 920:
The next step will be to mount the Myvu display unit on a pair of regular sunglasses.