This one of those projects that you do on a lark. I needed a tele-prompter, but really did not have a budget to purchase much less build one. This project cost me around ten dollars. If you have what you need around the house, it could be free. I meant this instructable for linux, but decided to make it more generic.
Note: I have no affiliation with Lowes.
Step 1: What You Need:
2- cardboard storage boxes. (16 x 12 x 12)
1 - any computer with a bright monitor that can run a web browser.
1 - mirror that will fit in the storage box. (mine was from the Dollar store).
1 - glass or plastic pane that will fit in the storage box. (mine was from an old scanner).
1 - extra box to prop up teleprompter if necessary.
Stand or table that will be a viewing height. (We used a cheap ironing table from goodwill.)
Stand to adjust mirror angle (i.e .https://www.instructables.com/id/Ipad-et-al-holder/ )
Box cutter or knife.
Step 2: Assemble the Boxes
Note: Since you are going to cut out part of the box, you only need to glue where it will not be cut out.
Put the top box on top of the bottom box so the open side panels are in opposite directions
Tape the two boxes together at the center.
Step 4: Putting It Together.
Open top box and insert glass at 45 degree angle.
Camera should be in top box behind glass. (i put mine in an envelope glued to the back of the box.
Step 5: Just Do It.
Note: I used a linux computer and wrote a bash script via the toilet and figlet commands to do the same thing as the web browser so we did not have to go to the web. I decided not to publish the code.
Step 6: HUD
Note: Most operating systems with a gui (graphical user interface) desktop will let you flip the screen in software to make things easier.
Step 7: Local Software,
Try at your own risk.
Step 8: Simple Batch File.
Simple batch file to print out text slowly.
$ ./slowprint.sh slowprint.sh
# A program to slowly cat file or standard input.
if [ "$1" ] ; then file="$1" else file="-" fi
cat "$file" | while read c ; do echo "$c" sleep .5 done
Step 9: Alternative Setup.
This method only requires one reflector.
Create text in OfficeWriter.
Export text to a pdf file i.e. test.pdf
$ sudo apt-get pdfjam
Reverse the pdf facing.
$ pdffip test.pdf
which generates test-flipped.pdf.
Show the file in your document viewer.
Do your video.
You will probably have more text that what I used.