I built one with a piece of plexiglass, an old bike helmet, an arduino with an lcd shield, a wooden board, a small mirror, and duct tape.
Step 1: cut board so that it is about 1ft (ish) long.
Step 2: duct tape board to top of the helmet. and sticking out in front of it.
Step 3: duct tape flat plexiglass sheet so that it hangs down from the end of the board in front of the wearer.
step 4: duct tape arduino with lcd shield pointing straight down at the very end of the board, pushed up against the plexiglass. (I used an arduino, but any kind of display being driven by any controller will work if it will fit.)
Step 5: duct tape the mirror on the inside of the plexiglass directly under the display at an angle. This is the most difficult part, as the angle needs to be very specific. The goal is to have the image from the display reflect off of the mirror, onto the plexiglass, and from the plexiglass, reflect back to your eyes. DO NOT AIM THE MIRROR AT YOUR EYES OR THE IMAGE WILL BE REVERSED AND YOU WILL NOT BE ABLE TO SEE THROUGH IT.
Step 6: (optional) use additional supports on the side of the helmet to secure the plexiglass. (otherwise it will swing back and forth in front of you while you walk.)
I got my mirror from an old scanner, but any mirror will do as long as it is at least as large as the screen you are using.
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