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Wiimote as Multi-Touch Display Controller

Posted by Soulskill on Wed Dec 19, 2007 10:37 AM
from the amazing-home-projects dept.
Hardware Hacking Wii (Games) Hardware
Tmack writes "While hard-hacks with the Wiimote are somewhat old news, this particular implementation is quite interesting. Using the infrared camera on the Wiimote, pens with LEDs instead of ink, and an LCD projector, Johnny Chung Lee of Carnegie Mellon University has created software to use them as a (relatively) cheap multi-touch display. Any surface onto which you can project becomes an interactive multi-touch display, as demonstrated in the video at the link. He has the software available for download, along with some other neat projects. Lee has also documented another impressive Wiimote hack.

Related Stories

[+] Hardware: Wiimote Hacking Goes Big-Time 51 comments
The Wall Street Journal is taking Wiimote hacking seriously. A front-page article from this past weekend discusses the many uses to which enterprising hackers have put the Wiimote, the motion sensing piece of the Wii console. Included is a video of a few of the projects in action. "Tim Groeneboom, who lives in the Netherlands, uses his Wii-mote to spice up his deejay act. He was inspired by a video on the Web of a California music student bobbing in front of the computer in his room and making jabbing motions with the Wii-mote to splice different tracks. During his second gig with the Wii-mote, Mr. Groeneboom, 22, says he was able to roam up to about 100 feet from his deejay booth and still be able to control how the music blended and do some sound effects ... Aaron Rasmussen has a sporting purpose for his Wii-mote. At his Garden Grove, Calif. software company, USMechatronics, he and his partner stuck a tennis racket in the 'hand' of a $40,000 industrial robot and then tweaked the Wii-mote to control the robot's arm so it can hit back tennis balls on the factory floor. 'This is what we do to relax,' he says."
[+] The Wiimote As Yoda Intended - A Lightsaber 268 comments
An anonymous reader writes "So what if the Wii can't handle the awesome 'next-generation' physics engine the other consoles will enjoy when Star Wars: The Force Unleashed is released? LucasArts announced today that Krome Studios is developing a version of the game for the Nintendo console, and players will finally get to use the Wiimote for its intended purpose — as a lightsaber. 'The sword-swinging action will be exclusive to the Wii version, and even then, it will only be available in an exclusive "duel mode." The description in the release says that this duel mode will be a multiplayer affair.'"
[+] Hardware: Multitouch Without Touch Using Wiimote 94 comments
owlgorithm writes to mention that Gizmodo has a neat hack for the multitouch Holy Grail — multitouch without the touch. This hack turns the Wiimote into a receiver for IR light reflected from an emitter off of your fingers using reflective tape.
Firehose:Wiimote as multi-touch display controller by Tmack (593755)
[+] Hardware: Head Tracking w/ the Wiimote 169 comments
mrneutron2003 writes "This guy just doesn't know when to stop. Johnny Chung Lee graces us with yet another one of his inventive Wiimote projects. This time it involves using the Wiimote and a pair of inexpensive LED safety goggles (with the standard LED's replaced with InfraRed ones) to allow positional head tracking , achieving an effect similar to what is experienced with three dimensional displays and CAVE systems. The video dramatically illustrates the effect. Game developers take note. This simple little variation on infrared tracking could allow for some seriously immersive gameplay in the future." This guy deserves a medal.
[+] Hardware: Python + Motion detection = Fweemote 30 comments
jedie writes "After reading about different Wiimote hacks on Slashdot I decided to make a video with some demos of my motion-detection library. You can watch the video here. There's a link to the sourcecode (GPL) as well, but the demo is win32 only. It's basically a webcam and some software in python to track LEDs (preferrably IRs). In the demo video, you see the software (albeit badly because of the webcam's IR filter being removed) tracking two differently colored LEDs, so multiplayer is possible. The software can track multiple points easily, and when combined with IR-LEDs, it's easy to simulate one Wiimote (i.e. calculating the distance and angle between two IR-LEDs to determine where the remote is relative to the webcam). I want the code to get some publicity, because I don't have time to work on it (dissertation, blabla) but I don't want the code (however messy it is) to go to waste."
[+] Technology: Wiimote Turns TV into Touchless MS Surface 104 comments
RemyBR writes "User interface project allows you to control objects on a display using gestures, working like Microsoft's Surface but without touching the screen at all. Inspired by Johnny Chung Lee's work, the system requires you to wear Minority Report-style gloves equipped with infrared emitters on your fingertips. A Wiimote on top of the display keeps track of these IR LEDs, while the software can read the motion down to two-finger pinching gestures for image zooming."
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  • I can get one now? (Score:3, Funny)

    by FatAlb3rt (533682) on Wednesday December 19, @10:40AM (#21751204) Homepage
    What's this...a way to pass time until the demand for the Wii consoles goes down enough that I don't have to crawl over people to get one? Sign me up!

    Oh...the Wiimotes are out of stock too? *walking away, hanging head*

    • Re: (Score:2, Funny)

      by morgan_greywolf (835522)
      There, there. On to the good news: we still have plenty of PS3's in stock, Mr. Alb3rt.

    • Re:I can get one now? (Score:4, Funny)

      by DrWho520 (655973) on Wednesday December 19, @11:12AM (#21751526) Journal
      I have seen Wiimotes everywhere, Buy Buy, Circuit City, Target and Walmart. Maybe they should contract to the Wiimote manufacturer to also start cranking out Wii's.
      [ Parent ]

    • Re:I can get one now? (Score:4, Informative)

      by Smidge204 (605297) on Wednesday December 19, @12:30PM (#21752452)
      Just about any CMOS webcam can be easily modified to see only IR light. It involves removing the IR filter (usually a small glass plate with special coating inside the lens assembly) and adding a filter to block visible light (usually a fully exposed piece of film negative).

      =Smidge=
      [ Parent ]

      • Re: (Score:3, Insightful)

        by ByOhTek (1181381)
        or Nintendo predicted a higher demand for the Wiimotes

        either
        (A) the Wiis are used less for multiplayer than Nintendo expected
        or
        (B) the Wiimotes have a higher survival rate than Nintendo expected
        or
        (C) A+B

        • Re: (Score:2, Funny)

          by damn_registrars (1103043)
          I particularly like option

          (B) the Wiimotes have a higher survival rate than Nintendo expected

          Since this could imply that perhaps Nintendo expected more people to (inadvertently) send their wiimotes crashing through their TVs or sailing across the room...

          • Re: (Score:2)

            by ByOhTek (1181381)
            inadvertantly, or intentionally.

            I have to admit, I'm quite annoyed with the detection on mine. I keep wanting to bash the thing against my coffee table because it won't detect that it is pointing at the screen.

            • I keep wanting to bash the thing against my coffee table because it won't detect that it is pointing at the screen.

              Check that there are no bright IR light sources nearby. Sunlight and Christmas lights are two common ones that confuse the Wii Remote. Also make sure that your Sensor Bar is far enough forward that it isn't blocked at certain angles.

              An easy way to figure things out is to go into the Wii Remote settings screen. There's a black and white image there that effectively shows you exactly what the Wii Remote "sees". You should see a few dots that do not flicker or go away as you move the remote around. If the dots disappear at any point during your tests, you may need to adjust your sensor bar.

              If the lights appear to be working okay, but the remote is still confused, try turning down the sensitivity of the remote. That will encourage the remote to ignore light sources other than the sensor bar.
              [ Parent ]

  • Wiimote is a Wii-Detector (Score:5, Informative)

    by imstanny (722685) on Wednesday December 19, @10:49AM (#21751294)
    The Wii-mote is actually a sensor that is used as a remote. It doesn't just send a signal, but rather it 'sees' the location of the 'motion detection' bar. In the traditional usage, it has only 1 point that it detects - the bar. But if you have 'many of these bars' the Wiimote is used as a detector of multi-inputs.

    • Re:Wiimote is a Wii-Detector (Score:5, Informative)

      by Paralizer (792155) on Wednesday December 19, @11:01AM (#21751420)
      The sensor bar has two IR points on either end to help with calculating things like distance. The wiimote itself can see up to 4 IR sources at any given time. So the multitouch interface would be limited to 4 pens, not that you'd need more than that though.
      [ Parent ]

      • they have size... (Score:3, Informative)

        by emj (15659)
        ... you see how big/close they are as well, so it's not just position.

        • Re:they have size... (Score:5, Informative)

          by slim (1652) <john@@@hartnup...net> on Wednesday December 19, @12:04PM (#21752114) Homepage

          ... you see how big/close they are as well, so it's not just position.
          No, the Wii software expects the Wiimote to see two IR dots (one on each end of the 'sensor' bar). Everything is calculated from these two points. X/Y position is the X/Y position of the midpoint between the two dots. Roll is the angle between the two dots. Z position (closeness) is the distance between the two dots.
          [ Parent ]

  • My project (Score:3, Interesting)

    by pkadd (1203286) on Wednesday December 19, @11:00AM (#21751400) Homepage
    I am currently working on using a wii controller as primary pointing-device for my livingroom. The goal is to make it the only device needed to controll the projector + PC i use for DVD, TV, and Music playback in my home. I will post info when i've figured it all out.

    • Re: (Score:2)

      by duckpoopy (585203)
      You should know that the wiimote does not emit infrared like normal remotes - in case that was your angle. The wiimote is an infrared camera. The IR emitters are in the sensor bar on top of your TV.

      • Re: (Score:3, Funny)

        by BobMcD (601576)
        That's nothing a little duct-tape can't fix!

      • But you can make IR patterns (Score:3, Insightful)

        by emj (15659)
        You can have three paintings on the wall, a phone, a radio and a TV, which all have different IR patterns. Then when you point you Wiimote on the phone painting, the Wii mote will see the pattern and tell your computer what you are pointing at. The compute

  • Detecting Parkinsons Tremors (Score:5, Interesting)

    by superid (46543) on Wednesday December 19, @11:16AM (#21751552) Homepage
    My own trival "hack". I'm using Darwiinremote [sourceforge.net] to read xyz accelerometer data and Octave [octave.og] to make/graph ffts of Parkinson's tremors. It's remarkably sensitive!

  • Nice hack but that's pretty much how some existing surface computing devices work anyway. That a mass produced device is cheaper is nothing new.

    • Re:Nothing new... (Score:4, Insightful)

      by skorch (906936) on Wednesday December 19, @12:10PM (#21752208)
      Some of the most important innovations are not about making something completely novel but about coming up with creative and more efficient ways of using what we already have. If this hack reproduces 75% of the performance of a commercial product at a fraction of the cost, then this is already a more cost-effective solution for simple touch-screen presentation software. It also puts it well within reach of the at-home user and not something that can only even be considered for large corporate presentations. All of a sudden an 8ft sq canvas for digital art is not out of the question, and it's scalable to a simple laptop as a tablet-pc replacement.

      And considering the application he offers is free this can only encourage more experimentation that can lead to even more innovative applications of a relatively cheap and abundant product which is (Nintendo sanctioned or not) becoming more and more of a multi-purpose tool.
      [ Parent ]

  • Better than the last one (Score:3, Insightful)

    by TheLostSamurai (1051736) on Wednesday December 19, @11:19AM (#21751578)
    When Johnny Lee posted his last hack [slashdot.org], it seemed like a cool idea to track your fingers in the air, but not all that practical, as was discussed at length. This hack however could actually have very practical applications for discussion and presentation, without the $5000 price tag of many interactive white board products. I'd like to see if anyone ever attempts to implement this in a small business environment, such as a design studio.
  • I'm so going to have to try this. The software isn't complex and with some work I'll finally have a giant digital canvas with the infrared pen acting as pen/airbrush.
  • I've got to believe that using this with photoshop is the best use...
  • The only problem, when you use this with a projector-based system, you're always casting shadows. It would be better as the presenter if you had a tablet PC replicating the screen display and you multi-touched on the tablet. Touch-sensitive screens are alw

    • Re: (Score:2)

      by Tony Hoyle (11698)
      Rear projection... most projectors can be setup for this (by allowing them to project a mirror image).

      It looks like an insanely cool hack, and using things you have lying around the house too.
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