85 Inch Rear Projection Wiimote IWB (Interactive White Board)





Introduction: 85 Inch Rear Projection Wiimote IWB (Interactive White Board)

This Instructable show how to set up a Wiimote Interactive Whiteboard using Johnny Lee's technique. There are other Instructables dedicated to setting up and utilizing the Wiimoteboard, so I am not going to cover the basic set up steps.

I originally set up a front projection system in my classroom with only one Wiimote and I found I had major tracking issues and it was difficult for my students to understand they couldn't block the camera in the wiimote. So I decided that I wanted to make a large rear-projection screen set up in my class.

At first I had trouble finding information about this set up. It is more time consuming to make so I assumed that is why it not commonly used. Originally I tried what some others had done, trying to use frosted glass or plexiglass but I got really poor diffusion. I also tried the Frosted shower curtain approach which also gave poor results (hot spotting).

I finally decided to spend the $37 dollars on actual rear projection material. And the results blew my mind. I then built a frame and support legs with wheels for my screen, all in all it cost me about $75 - $100 including the screen material. This is by far the easiest to use and explain wiimote set up and my students love it.

Step 1: Building Your Screen

I purchased my screen material from Rose Brand Grey Rear Projection Screen material I purchased two yards @ $16.95 a yard. This works very well with my projector, 2200 lumens, with no real hot-spotting. You can find it here - http://www.rosebrand.com/product703/Projection-Screen-and-Rear-Projection-Screen.aspx?cid=218&idx=1695&tid=1&info=Screen%2bby%2bthe%2bYard

I built my frame out of 1 1/2" by 1 1/2" by 6' boards. ( a 2x4 ripped in half long ways). My dimensions were chosen by setting up my projector and seeing what size was comfortable for me. It ended up being 44 1/2" by 71" (just shy of the two yards of screen material length). So the screen diagonal came out to be roughly 86" which looks beautiful.

I used L-brackets I bought from Home Depot, so that I did not have to cut 45 degree angles and worry about matching them up. After building I found that the joints were a little week so I also attached a metal strap at each corner to give it more stability.

After the frame was build I used a regular stable gun to attach the screen material. I wrapped the material all the way around and stapled it on the back. I folded the material a few times in order to give it some strength where the staples went through.

Step 2: Building My Stand

I decided to make my legs as basic as possible, a simple "T" design. After making the "T" I decided to make a cross beam for each side of the leg in order to give the whole structure more strength.

I used a metal bracket for the main T-Joint, in order to give it more strength and to help make both legs identical.

Step 3: Attaching Screen to Legs

I attached the Screen to the Legs, by drilling wholes through the Projector frame. Then I drilled matching holes into each leg (it is important to remember to drill your holes off centered on the legs so that you do not have any of the leg blocking the picture since it is rear projection)

Once all holes were drilled I ran Carriage bolts through the front of the screen holes and through the Leg holes. I used Wing nuts instead of regular nuts, so that I can take my screen apart and set it up without any tools.

Step 4: Wheels and Crossbar

I added caster wheels to my screen so that it can easily be moved around my classroom.

I also added an extra support crossbar which connects the legs together. This is simply a 1x4 plank attached to each leg with two more carriage bolts and wing nuts.

I also painted my frame so that it had a more complete look.

Step 5: My Set Up and Video

I have my projector set up behind my screen with my wiimote sitting on top of the projector. Once calibrated there are zero problems with tracking through the screen. It works amazing.

Check out my youtube video to see it in Action!!!




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    20 Discussions

    Very VERY cool, ill be looking into doing this once time permits.

    Hi, would it be possible to reduce the throw distance with mirrors or something, or maybe a short throw lens accompanied by a lens that takes the small image (the image is small because of the distance it hasn't traveled) and spreads the image to cover the canvas? Is anything like that possible so that the projector, Wii mote, and supplies can be hard mounted as a part of the display?

    Awesome board. I am going to make something similar this weekend. I had a question about the width you purchased for the screen material. Was it the 55 inch? I'm sure it was based on the price but I want to make sure before I order it. How is the board holding up? Any changes you would make in retrospect? Thanks for the inspiration and motivation to take on this task.

    I heard some good stuff about weaving together wax paper as a backdrop. Where do you place the wii in the set up from behind, cause you must get very clear light blobs...

    7 replies

    the wiimote is behind the screen sitting on top of the projector. This way it is impossible for my body to get in the way of the infrared light. It passes through the screen material with no problem.

    Tom, you have very much inspired me to start playing with retro projection, although as we have less class space in Spain, a mirror or two might be in order... if the wii is on top, everything should get passed through the mirror, I suppose.

    I am actually working on the same idea, I just bought my mirrors a few weeks ago, but with school starting up I have not had the time to complete the project. If you have any success please let me know. and I will do the same. From what I understand about light and mirrors the concept should work fine.

    Did you ever follow through on adding a mirror to shorten the throw distance? I really want to do this but with a piece of acrylic on the front so I can use a pressure sensitive pen. Acrylic kind of blows my budget and it seems like it would have to be really thick in order to be sturdy at such a big size screen. Check out this instruct able I just threw together for how to make a pressure pen. https://www.instructables.com/id/Pressure-Sensitive-Tip-IR-Pen/

     I keep getting ghosting (glass) or crap reflection (plastic ikea mirror)  any luck on your side?

    Im running on my mac. and the programs i use are Safari for internet (obviously), Sketchbookpro for the whiteboard like handwriting, and google earth for the maps.

    This is incredible! Great job and awesome instructable! I need to look at Johnny Lee's wiimote instructable for sure. Thanks for putting this together!

    what distance is the wii from the screen? I'm trying to work out maximum screen size/distance... Front projection will work from a much further distance of course - but like you I'd rather use rear projection!

     While I hate to nit-pick such a wonderful article, it should be noted that what you type as "whole(s)" should be "hole(s)". A "whole" refers to a single entity including all subcomponents without exception, while a "hole" is an opening into or through something.

    Otherwise, very nice!


    i'm curious that can I use projection screen material in different brand? and can wii remote capture IR source through the projection screen material?

    1 reply

     I have never tried any other brands, but im  sure there must be others out there. I would recommend doing a darker color this helps with hot-spotting issues. The IR capture as worked great for me, this is because it is meant to have light shine through it (rear-projection)

    Are most projectors capable of projecting from the front and the rear, or do you have to get one that is specifically a rear projector? 

    Great usage of the technique, really well done. I had considered Johnny's idea as a nice novelty, but didn't really have a use for it, now I could really see this for doing graphic work and presentations. Thanks for another reason to avoid doing actual work for awhile lol

    you should add a link in the beginning because I was a little confused there for a second.

    Just select "Johnny Lee's technique" in your intro, click "link" and paste "https://www.instructables.com/id/In-depth-Wiimote-Whiteboard-How-to/" as the address

    really cool though, it's like the internet hands-on, great build.

    1 reply