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Messages - Luke

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Linux / Re: linux support planned?
« on: February 14, 2008, 11:50:04 AM »
hmm ... never heard of MPX until now, so don't know that one. I would imagine the whiteboard GUI would need to be changed to interface to ta bluetooth driver supported by Linux. A .NET wrapper could be written to hide this away keeping the core code exactly the same.

Linux / Re: linux support planned?
« on: January 27, 2008, 09:32:05 AM »
Hi just to say that I have the Linux version of the whiteboard running under Ubuntu Gutsy Gibbon, it works like a charm! It also very easy to setup, although I would like to add a GUI to it for future code optimisations, such as the right click support.


Wiimote Interactive Whiteboard / Re: Code explanation
« on: January 17, 2008, 11:10:12 AM »
As far as I can tell it uses a process called "pixel coordinate translation" using a stereo camera algorithm but with the Z(depth) component fixed. The use of stereo algorith gives a better output but is far more complex than a single camera translation. If you wanted to add a second remote control the warper.cs class would need to be changed considerably to accept parameters from both controls; also the maths may require more calibration points, depending on whether both cameras are lookingat the same screen or will they be used with a fixed depth (as is the case now) but to extend the whiteboard area.

Linux / Re: linux support planned?
« on: January 15, 2008, 03:53:56 PM »

there does exist some linux code at I have not tried this but have inspected the source code out of interest. This is command level with no GUI for the user but the authors have it working on Ubuntu.


IR Pens / Re: Compact IR Pen
« on: January 13, 2008, 01:49:13 PM »
Nice pen! Yes i need to make some mods to improve light diffraction through the sides of the LED. I am thinking of glueing some foil to the tip, or sanding the tip to make it opaque. Will post the results.

IR Pens / Compact IR Pen
« on: January 11, 2008, 03:17:16 PM »
Here's my completed whiteboard pen for the wiimote hack.

I made this using only a AAA rechargeable battery, a micro push switch, an IR LED (20mA 1.3V supply), and a lot of locktite! (see below). The LED is from Rapid Electronics (see datasheet with a peak bandwidth of 940 nm. It fits snug in the end of the pen, with the aid of locktite, and is then connected to the push switch mounted on the side of the finger grip. I drilled a small 2.5mm hole in the side of the pen to pass the wires through. the problem I then had was ensuring a good connection with the battery while making it easy to replace. the end of the pen fits tight while remaining still easy enough to remove. I used a spring loaded probe glued in the top cap of the pen (gold bit of bottom photo) soldered to a wire to make contact to the positive side of the battery. I then used a spade connector, as used in car wiring, and cut a slot in the pen just above the grip for it to pass through; this will make contact with the negative side of the battery. To complete the circuit I soldered a wire to the spade connector and glued the whole lot to the pen.

Just need to get the software setup to use it, in the mean while I tested it using the sensitivity screen on the wii and all is good.

Posted on my blog

Gabort, I don't think the wireless nunchuck solves the issue. It is not a combined solution; it may be off the shelf but I think what the user would want is a pen that does all this. It may be possible to replace the wireless nunchuck with a wireless pen which communicates in the same way as the nunchuck but still uses the IR emitter to be tracked by the wiimote.

Shadwhawk, Your idea with the 3 leds in a sensor bar sound ok but why not expand the number of operations by using binary counting. Assuming all 3 leds off means no action there can still be a possible 7 actions. e.g.

0    0    0    -> No action
0    0    1    -> Left click 
0    1    0    -> Right click
0    1    1    -> Middle click
1    0    0    -> Mappable 1 (e.g. powerpoint blank screen)
1    0    1    -> Mappable 2(e.g. Exit full screen)
1    1    0    -> Mappable 3
1    1    1    -> Mappable 4

I doubt all these functions can be built into a pen but it is do-able in some presentation style control with a pointer.

I also see benifit in the pulses idea for this will conserve battery life by not requiring the led to always be on, and only required one led. I hope to look further into the possibility of pulsing the led, just have to get the code building and operational first, should not be too hard to determine the pulse width although it must be considered that windows has a timer granularity of 10ms, so a pulse should be at least 20ms wide.

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