Moving this post to the correct section.
Ever the glutton for punishment, I've been working on a way to have a functional HUD that fits into a Mando helmet. There's currently some setups for motorcycle helmets and a few versions of "smart glasses" out there, but I don't want this to cost a thousand bucks. Ideally, if it could be under $100.00, I'd be happy.
To that end....... Here's a quick rendering of what I came up with. There's a 0.96" OLED screen sitting inside the helmet, at my left temple. It's slightly angled, because I have a fat head, but could face more forward, depending on your space. I purchased a cheap Chinese knockoff of a "Cobra" style sight/scope. It uses a collimated lens assembly, which is what I'm needing for this build. Think of a collimated lens as a magnifying glass with a reflective surface applied to one side.
I CAREFULLY machined the lens housing off the body, and have it positioned in front of my left eye. Eventually, I'll make a better mount for it, but as a conceptual prototype, it's just cardboard and hot glue. Maybe something 3D printed, down the road. Perhaps even some sort of way to have the lens assembly pivot or lift out of the way when I'm not using it. Anyway.....
I know this pic is small. If you click on the drawing, then right click and have it open in another tab, you should be able to enlarge it there.
An overhead view:
(https://i.postimg.cc/yY7j0DFr/HUD-3.png)
How it looks on the helmet. The animated display is visible to others, through my visor:
(https://i.postimg.cc/ZKdN9TjX/HUD.png)
Here's a quick video. After several attempts, I finally got a decent shot of it. The camera kept trying to auto-focus on the cardboard and hot glue. Sorry for the fingerprints on the lens. LOL. One cool thing about a collimating lens though, the reflection stays in focus no matter how close or far away your eye is.
Because of the OLED's position, the HUD has the animated display off on the periphery of my view. Basically on the far left of my vision, but it's perfectly clear. There's about a quarter inch space below and to the inside of the display, to add indicator LEDs, strips of EL tape or LED bar graphs. They should be fully visible to the left eye. They'd appear to the right of the reflection, in the lens. Not sure what to add there, but I'll think of something. Definitely open to suggestions. If the wires were set up a bit differently, I could perhaps have the OLED oriented in "landscape" rather than in "portrait", but it would take up more of your view.
A parts breakdown...
The animated OLED display is available here, on this forum: http://mandalorianmercs.org/forum/index.php?topic=124894.0 (http://mandalorianmercs.org/forum/index.php?topic=124894.0)
I'm using this one:
(https://i.postimg.cc/Xv5nz3c5/OLED-display.jpg)
Here's an Airsoft knockoff of a collimated sight. I found one used, at a gun show, for $10.00, though I think they're 2 or 3 times that normally. A "real" one (for an actual firearm) would be more. The flat surface (on the front, away from the eye) has a reflective surface, when viewed through the convex side of the lens. The combination of about 30% reflection and the magnifying power, gives clear reflection on something about 3 inches away, give or take.
(https://i.postimg.cc/52PsxBgf/collimated.jpg)
There's a couple other HUD concepts I'm still experimenting with. I'll add them to this thread. Please feel free to comment or offer suggestions. I have thick skin, so even if you want to point out how having a HUD that only you can see, and an eyepiece that could interfere with your vision will get old fast, feel free. :D Believe me, I've had that conversation with myself several DOZEN times. LOL
For those wanting the HUD to be viewable by others, at troops or whatever...... It's a lot easier for you. Because you don't have to get the image, video or animation focused to YOUR eye, you can just rig up a reflective piece of plastic or glass angled FORWARD to reflect towards spectators. I rigged up a fast and cheap version of this by making a cardboard "visor" with the same OLED display taped to it, but with the display pointing downward. Then it was just a matter of having a piece of clear plastic sheet for it to reflect onto.
(https://i.postimg.cc/0Q2wTPPV/HUD-1.jpg)
To that end, you could have a long strip of reflective sheet that's able to pull down from the visor, to have people see a reflection of whatever you have mounted. Like this:
(https://i.postimg.cc/mDc5SQ3W/HUD-4-others.jpg)
If you click on the drawing, then right click and have it open in another tab, you should be able to enlarge it there.