Building an HMD with no special parts, to make work easier and safer
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The optical design will be the most difficult part, but I think I found a solution for this.
Follow the project logs to see the updates. The costs of the prototype amounted to 70Euros.
Video of the working device
Link to the video and Link to the video in German
One of the Prototypes
I'm really feeling pissed off, when I see people using my designs and try to sell them as their idea.
This guy makes a nearly 100% copy of my Data Glass and only after I send him an email he added "inspired by Alain^s Projects". just inspired, really ???????
I think that's not the way open source should work. If you use the work of someone else, the minimum is to mention this person and set his website link in the description.
The only thing which calms me down, is that it is still my invention and other people will know it.
Hi, the lens is still the problem, because it is not easy to find.
I think, I found a good alternative. A small Fresnel lens. Easy to find, cheap and you can cut it with a pair of scissors.
Hopefully I will find the time to test it.
The focal length is about 110mm, with should be fine.
The new displays just arrived. Will build a smaller version.
I think I will start a new project for this.
Thinks to do:
Finally, all fits together.
Now a nice video of it, a full description and I'm done.
I needed to change the LiPo batteries. I use now a smaller, 280mA, instead of the 330mA. For this I had to change the resistor in the charger circuit. It's 3k smd part. I soldered a normal resistor with the value of 5.6k in place to reduce the charging current to 200mA.
Until now, I heated the reflection screen and bent it to 45 degrees. To make the construction easier I printed a new holder. In the picture, you can see the difference
I finally start handling the 123Design software and my 3d Printer.
I was totally focused on my cardboard design enclosure, but at the end, I had to redesign the glasses due 3d print problems. Now you can adjust the reflection screen, to get the best view.In the next few days I'll test the electronic with the new LiPo, but I'm still waiting for the lenses.
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I finally printed out the covers for the enclosure. The mirror and the lens are mounted with all the electronics. All fits in, and it works great. This one has a lens with a focal point of 100mm.
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All in. The controller, bluetooth, display, charger and the LiPo Batterie.
I just bought me a 3d Printer, and this is the first enclosure for my Dataglasses.
The lens was a tricky thing. I had not really an Idea about optics. So I googled and googeld, and I learned a lot about real images, virtual images focal points, and magnification. The best working lens is an Acrylic Plano convex lens with a focal point of 100mm. If you place the screen at a distance of 73mm from the lens away, you will get a virtual image at a distance between 27-30cm. The magnification factor is x3
That's perfect, because another important thing is, that your eyes can only start focusing things at +-25 cm
I found this website to calculate the object distance.
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/image4.html
Here are all the parts for the data glasses
I just used a smaller battery.
To use the 280mA battery, I had to change the 3k resistor against a 5.6k resistor on the original board. The charging current is now reduced to +- 200mA.
Thanks, that's an Idea, but I was not sure if it will work, until I saw the first results. There are a few days left for the citizen scientist ;)
Alain Mauer
vcazan
eimer.josh0
Walter Dunckel
This is really cool. You should send this to the Hackaday Tip Line and the Hackaday Prize.