[3D] Draw in air with Wii controller in Matlab

by Tim Zaman · April 6, 2011

This code in matlab enables you to write with your wiimote in free-air to a pointcloud. So you can make a 3d drawing! You can draw in the air, either connected lines or just points. The code is actually fairly easy, but this is what you need to do:
Put the wiimote somewhere pointing to you (we will use its infrared cam). Then, you can draw in the air using either infrared leds connected to batterys, or better: buy a infrared bar from ebay! I did and tested both just fine. This code i wrote 32 years a go so its a bit old. But so are the wiimotes. But, they’re cheap too! Buy them via ebay for like $15.

Requirements
You need a infrared LED (just connect it straight to a AAA 1.5v battery =)). And otherwise you need a Infrared wii bar (buy it on ebay for like $2).
You need to install the WiiLAB files. Also, you have to connect the Wiimote via bluetooth with your computer (easy). I recommend blue-soleil as bluetooth driver, that worked very well for me. Also this code is tested in Windows 7 and Windows XP.

Code

addpath 'C:Documents and SettingsXXXMijn documentenMATLABWiiLabWiiLab_MatlabWiimoteFunctions'

addpath 'C:Documents and SettingsXXXMijn documentenMATLABWiiLabWiiLab_MatlabEG111-H'

```
 
```
```
clc
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clear all
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close all
```
```
% Connect to the Wiimote
```
```
initializeWiimote();
```
```
 
```

% Create the graphics Window (optional but recommended)

```
%initializeWindow(0);
```
```
 
```
```
 
```

% -------------------------------------------------------------

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```
```
 
```
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% YOUR CODE HERE
```

% Any graphics objects that will be used throughout your program should go

```
% here.
```

% For example, if you are creating an program that will use the Wiimote

% to move a circle around the screen, you should create the circle here.

```
 
```
```
 
```
```
Im=imread('test.jpeg');
```
```
figure
```
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```
```
 
```
```
xLB=200;
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```
yLB=200;
```
```
hoekdiff=0;
```
```
afstscale=0;
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```
xM=0; yM=0; zM=0;t=1;
```
```
 
```
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BG=uint8(ones(800,800));
```
```
BGIm=uint8(BG);
```

BGIm(xLB:xLB-1+size(Im,1),yLB:yLB-1+size(Im,2),1:3)=Im;

```
 
```
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%imshow(BGIm)
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x=0;y=0;z=0;
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```
x1=0;x2=0;y1=0;y2=0; eerste=1;
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getWiimoteBattery()
```

% -------------------------------------------------------------

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```
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```

% Check to make sure the Wiimote is connected

```
if( isWiimoteConnected() > 0 )
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    % Main program loop
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```
    % Used for polling the Wiimote data
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    % This loop will run until 'HOME' on the Wiimote is Pressed

```
    while(~isButtonPressed('HOME'))
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        % -------------------------------------------------------------

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        % YOUR CODE HERE
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        % The main portion of your program will go here.

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        % Functies:
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        Twee=0;
```
```
 
```

        [xp1 yp1 xp2 yp2] = getWiimoteIR;

        if xp1>0 && yp1<1 && yp1>0 && yp1<1

```
            x1=1-xp1;
```
```
            y1=yp1;
```
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            Twee=1;
```
```
        end
```

        if xp2>0 && yp2<1 && yp2>0 && yp2<1

```
            x2=1-xp2;
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```
            y2=yp2;
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            Twee=Twee+1;
```
```
        end
```
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```
```
        if Twee == 2
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```
            t=t+1;
```
```
            clear Imr BGIm
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```
            BGIm=BG;
```
```
            if eerste == 1
```

                hoekeerste=atand((y2-y1)/(x2-x1));

                afst=sqrt((y2-y1).^2+(x2-x1).^2);

```
            end
```
```
            eerste =0;
```

            hoeklive=atand((y2-y1)/(x2-x1));

            afstlive=sqrt((y2-y1).^2+(x2-x1).^2);

```
 
```
```
 
```

            hoekdiff=hoekeerste-hoeklive;

```
            %afstscale=afstlive/afst;
```
```
 
```
```
 
```
```
            xM(t)=(x2+(x1-x2)/2)*200;
```
```
            yM(t)=(y2+(y1-y2)/2)*200;
```
```
            zM(t)=afstlive*500;
```
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```
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```
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             beep
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```

             plot3(xM(2:end),zM(2:end),yM(2:end))

```
             axis([0 200 0 200 0 200])
```
```
 
```

            %Imr=imrotate(Im,-hoekdiff,'nearest');

            %Imr=imresize(Imr,abs(afstscale),'nearest');

```
 
```

            %BGIm(xLB:xLB-1+size(Imr,1),yLB:yLB-1+size(Imr,2),1:3)=Imr;

```
            %imshow(BGIm)
```
```
 
```
```
        else
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            eerste=1;
```
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            %Im=Imr;
```
```
        end
```
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```

        %plot([x1,x2,],[y1,y2],'o','LineWidth',2,'MarkerEdgeColor','k','MarkerFaceColor','g','MarkerSize',10)

```
        %hold on
```

        %plot([xM],[yM],'o','LineWidth',2,'MarkerEdgeColor','b','MarkerFaceColor','r','MarkerSize',10)

```
        %axis([0 1 0 1])
```
```
        %hold off
```

        %text(0.35,0.5,['hoek  ' num2str(hoekdiff)],'HorizontalAlignment','left')

        %text(0.35,0.6,['afstandschaal  ' num2str(afstscale)],'HorizontalAlignment','left')

        %text(0.35,0.7,['Locatie Mid  ' num2str(afstscale)],'HorizontalAlignment','left')

```
 
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```
        if(isButtonPressed('ONE'))
```

            disp('Calibration in 2 sec..')

```
        end
```
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```
```
    if(isButtonPressed('TWO'))
```
```
        x=0;y=0;z=0;
```
```
        close all
```
```
        figure
```
```
    end
```
```
 
```
```
    if(isButtonPressed('B'))
```
```
        setWiimoteRumble(true)
```
```
        pause(.3)
```
```
        setWiimoteRumble(false)
```
```
    end
```
```
    if(isButtonPressed('A'))
```
```
        setWiimoteLEDs(1, 0, 0, 0);
```
```
        pause(.1)
```
```
        setWiimoteLEDs(0, 1, 0, 0);
```
```
        pause(.1)
```
```
        setWiimoteLEDs(0, 0, 1, 0);
```
```
        pause(.1)
```
```
        setWiimoteLEDs(0, 0, 0, 1);
```
```
        pause(.1)
```
```
    end
```
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```
 
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```
 
```

    % Pause - This is a required step. If it is not included you will

```
    % experience unexpected behavior.
```
```
    pause(.001);
```
```
 
```

    % -------------------------------------------------------------

```
 
```

    % Redraw - This is for the graphics functions to make sure they are

    % displaying the most recent changes

```
    redraw();
```
```
 
```

    % Pause - This is a required step. If it is not included you will

```
    % experience unexpected behavior.
```
```
    pause(.001);
```
```
 
```
```
end % while
```
```
 
```
```
else
```
```
 
```

    % The Wiimote was not successfully connected

    message = [ 'There was a problem with connecting to the Wiimote. ' ...

        'Please make sure the Wiimote is properly connected ' ...

        'to the computer and rerun the program.' ];

```
 
```

    % This will write the message to the command line

```
    disp(message);
```
```
 
```

    % This will create a message box with the message

    uiwait(msgbox(message, 'Connection Problem', 'error'));

```
 
```
```
    end % if
```
```
    close all
```
```
 
```
```
    % Disconnect the Wiimote
```
```
    disconnectWiimote();
```

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