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Messages - bobster23

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1
General Hardware Talk / Re: Open camera questions:
« on: March 28, 2010, 05:39:24 PM »
Johnny Lee had an article (on his blog) on connecting the wiimote pixart camera directly.
Here is the link:
http://procrastineering.blogspot.com/2008/09/working-with-pixart-camera-directly.html

It is very informative

2
General Hardware Talk / Re: Resolve Under Sampling
« on: February 07, 2010, 03:39:58 PM »
Hi Sean,
I'd like to help you but am not completely sure on what you mean so I'll do a bit of guess work (and try to answer your question).

First off I don't really know what you mean on the z axis. The wiimote camera is able to follow up to 4 points and for each point give the following information: x axis location, y axis location, size. So i'm guessing what you mean when you talk about z axis is either your using a program that looks at the size of a point, or your doing what the wii is doing which is looking at 2 bulbs that are at a fixed distance from each other and measuring their distance from one another with the wiimote camera (and calculating the z axis using triangulation). If you say you have 2 infrared bulbs I'm guessing your doing the later in which case the cause of your problem may be that one bulb is flickering or your not holding the bulbs at a fixed location.
You can easily check if a bulb is flickering in one of 2 ways. If you have the wiimote hooked up to your computer then download wiinremote from this site: http://onakasuita.org/wii/index-e.html which it lets you see the raw feeds from the wiimote (that way you can see the points the wiimote is seeing). Another method is to take a camera on a cellphone and look at the infrared bulbs through it. The trick is that some cellphone camera (not all) are able to detect infrared light, so you should be able to see if light coming out of your bulbs that should look like a bright white light. That way you can check if the bulbs work properly.

Secondly what do you mean by infrared bulbs. Most people use infrared LEDs so I'm guessing you mean IR LED (plus they look a bit like a bulbs). This is important for the following reasons.
1. In a clear (non defused) led the light is brightest from the top, like in the picture on this site http://www.instructables.com/id/Wiimote-Whiteboard-IR-Pen/step4/Final-Assembly/
(the 3rd picture)
so you have to aim the led correctly at the wiimote or it will not see properly (and maybe cause some sort of flickering on the wiimote camera)
2. LED stands for Light Emitting Diode, meaning it is a type of diode so the direction of the current is important, so you have to connect the LED in the correct direction. (If you get something in the z axis I'm guessing you did but its worth a check anyway)
3. Not all IR LEDs are the same. The wiimote has a filter (the black thing in the front) where the maximum sensitivity is at this wavelength 940nm. By all means that doesn't mean other LEDs won't work. Its just that if you can see the LED with a cellphone camera, and not with the wiimote it could be that the LED is not in the correct wavelength.

I also came across this site which may be helpful to you:
http://doctabu.livejournal.com/64758.html

I hope I was helpful 

Bobster

3
Project Ideas / Re: did any one uze the wii in the FTIR config
« on: January 26, 2010, 03:19:26 PM »
Dear Uzi,
            I don't know of anyone who has made an FTIR multitouch display, but it should be possible. There are a few things though you should take into account:

1. FTIR works when the camera (or in this case the wiimote) is behind the table, so you need back projection. That is why most people that just want to convert a normal front projection into a touch display need a pen, as it reflects from the board.
2. The wiimote has a field of view of 45 degrees. This is just something you have to take into account when placing the wiimote.
3. The wiimote can track up to 4 points (location and size) not like a webcam that can track an infinite number of points (and shapes). That is done in the hardware level of the wiimote camera (so it can't be changed).
4. You said your project has latency issues with the webcams. You have to check that the wiimote doesn't have the same kinds of problems. The wiimote does the tracking on a hardware level, but the communication is by blue-tooth. I don'd know what the difference in baud rate is or if that could be a potential problem.

I think it is feasible. I hope i helped you

Bobster23

4
Project Ideas / Re: i need a little (well, a lot of) help...
« on: July 20, 2009, 09:14:49 PM »
hi biggauges85

Quote
i notice the wiimote and the nun-chuk  both say they have motion sensitivity. is this true?

The answer is yes. they both have an accelerometer in them and that is how they sense motion

Quote
is it the same type of motion sensor in the nun-chuk as the wiimote?

If I'm not wrong they have the same exact accelerometer (same chip). The difference is that the wiimote has extra sensors, mainly the camera whichs make the electronic whiteboard project possible.

Quote
i guess the reason is i'm trying to figure out how many axes there are.

There are 3 axis.

Quote
there is one thing though, i bought a nyko wireless nun-chuk instead of the official one.

I don't think that this should be a problem if it connects to the wii console. I don't have any experience connecting the wireless nunchuck. You should be able to see it but if not it may be a driver issue. Maybe someone else could be able to help you.

Quote
now i used bluesoleil, glovepie, and/or (i don't know if it helps or not) ppjoy. when i got my sixaxis connected i had to use about 4 different programs before i could use xpadder with it. do you guys think it's possible to use xpadder?
Sorry I can't help you with the last part.

Bobster

5
Project Ideas / Re: How does the Wii Remote Work
« on: July 20, 2009, 08:57:35 PM »
Hi cabdolla,
            This can be done.  You can see this and a few other similar videos on youtube that have done this:

[youtube]http://www.youtube.com/watch?v=EdNrArR9EuE[/youtube]

Bobster

6
Dear caeious,
                 I think you might find what you are looking for maybe easier on another open source project. You should check this site:

http://nuigroup.com/

They have an open software program called "Multitouch Media Application Pro v3 Release" and are basically like the microsoft surface. They use a normal webcam that you have to slightly modify (not too hard) that is set behind the tabletop (in your case mirror). Thay also have luminating leds and can detect "naked fingers". They have howto tutorials. Here is a clip demonstrating how it works:
[youtube]http://www.youtube.com/watch?v=H1pNJfR_hno[/youtube]

Hope I could be of help. Good luck
Bobster

7
Project Ideas / Re: Wiimote and ServoCommander
« on: February 22, 2009, 12:08:40 PM »
dear tsknutsen,
Your idea sound interesting. There are alot of different thing that people have made with the wiimote. There have been people that have done something similar to what you have said but they don't use the camera on the wiimote (like in head tracking). The wiimote has accelerometers that are able to follow different axis. This site explains which axis they have: http://yg.typepad.com/majorstudio2/2007/02/accelerometer_a.html

Here is someone at the university of oxford that have used the wiimote to do this:

http://www.youtube.com/watch?v=VWN9TvweZc8&feature=related

Even though it might be possible to do this with head tracking (I don't really know), the biggest disadvantage is that if you turn your head too much the camera can loose sight of the leds on the heads (as apposed to head tracking where you always look at the screen).

The disadvantage of using the accelerometer is that the wiimote is big to mount on your head!!! If you know electronics you might be able to take out the chip from the wiimote and connect it to a microprocessor because the chip is very small (but then again you can just buy an accelerometer chip by itself).

Anyways I hope I helped. Keep us updated

Gil

8
General Hardware Talk / Re: PC + Wii: possible?
« on: February 14, 2009, 10:13:40 PM »
Dear Red Bear,
I came across someone who has done a walkaround to connecting to the camera (without soldering). Apparently you can use the wiimote to connect a microprocessor (or fpga) to the compter using bluetooth. This guy did it:
http://www.windmeadow.com/node/45

From what I understand he relays the information from the camera to the computer and back through the wiimote to the microprocessor. There is also a heated discussion on this page(in the comments at the end of the page):

http://www.windmeadow.com/node/42

about if it is possible to connect directly communicate with the camera. One thing is for sure if it is possible than it requires a firmware update for the wiimote (so its going to be tough).

Hope this is helpful to you
Gil

9
Project Ideas / using 2 wii's to follow 2 different hands
« on: February 14, 2009, 08:53:55 PM »
Hi all,
I was just browsing different youtube videos and just thought of an idea of how to get 2 wiimote to each follow 2 hands, and know which is which (which is left and which is right). This is just on the top of my head and I can't think of practical uses for this, so maybe someone has an idea for uses.

The idea is to change one of the wiimotes filters, and use different frequency leds on each hand (worn on a glove). A maximum of 8 points tracked. That way maybe you can do a 2 handed minority report sort of thing. Initialization (so each wiimote knows where it is) may be a problem but there should be a walk around.

another idea is to use it to track 2 different people on the head tracking (maybe split the screen in 2).

This is just an initial idea. Please tell me what you think (if you can find uses for this).

Gil

10
General Discussion / Re: fpga board and wiimote
« on: February 14, 2009, 01:06:18 PM »
Dear EnigmaticRonin,
From what I understand of what you are trying to do the have a few options. If I understand correctly you want to connect to the wiimote camera but the wireless aspect isn't that important (meaning the wiimote can be close to the board). In this case you have 2 possibilities:

1. (less favourable but definetly feasible) If you don't mind getting your hands dirty than you can desolder the wiimote camera and connect it directly to the fpga board. The wiimote camera uses i2c protocol to conect and people have connected it to microprocessors. If you need links to this just ask, I have a few.

2. (more favourable but not sure how its done) I remember reading somewhere that you can access the camera through the usb where the nunchuck is connected. I can't remember where but after a small search I found this site that seems to confirm this:
http://www.metacafe.com/watch/930208/easily_turn_a_wiimote_into_a_mouse/

I wouldn't connect the wiimote to the computer with this hack but it seems to confirm that there is some kind of connection there. Maybe someone else can help you with this

About connecting to the wiimote through the bluetooth I don't know how they do it exactly maybe someone else can help you with that approach. I hope I helped

Gil

11
General Hardware Talk / Re: PC + Wii: possible?
« on: February 14, 2009, 09:00:04 AM »
Hi Red Bear,
       The answer is that they work alone. You can even just buy the wiimote and connect it to the computer. The Wiimote connects through the standard mouse protocol (but from what I read they abuse the protocol). There are already written program for all kinds of things or if you want to program your own program I think there are SDKs.

Gil

12
General Hardware Talk / Re: PC + Wii: possible?
« on: February 14, 2009, 06:35:12 AM »
dear Red Bear,
          The answer to your question is yes if (i understand you right) and it is very easy to do. From what I understand you want to connect the wii remote (a.k.a wiimote) to the computer (and not the wii console itself?).

Anyways if you want to connect the wiimote to the computer all you need is a wiimote (no need for the console) and a bluetooth conection to the computer (I read you can access the remote via usb through the numchuck connection but i know the exact details of how this is done). Once connected you can just run a program or write your own (people here can probably help you since i have not written a program for the wii yet).

I hope i answered your question

Gil

13
Say Hi! / Re: Hi, from Kansas City
« on: February 14, 2009, 06:08:28 AM »
hi all,
         Guess what i found. this dj table does a projection from below and wiimote from above (it seems like they used bits from an old type overhead projector). Here is the link:

http://www.youtube.com/watch?v=OiwChpthPug

anyone know more of this project (If they have detailed instructions on how they built it)

Gil

14
Say Hi! / Re: Hi, from Kansas City
« on: February 14, 2009, 05:01:20 AM »
Hi Wiweeyum,
I'm not sure it's not feasible. I think that it may be possible just by using mirrors (to get the distance).

Gil

15
Hi all,
     Thanks for the responses. About the idea of using a webcam, I think it is going to hard to link them to a microprocessor.  But thanks for the idea.

About benpaddlejones's idea of going to mouser thanks for the idea. I haven't quite found it yet (because they have a huge catelog), but I have found other chips that I have been looking for for a long time (and they even have an office near my house which makes it that much easier) so thanks. If I do find a camera that does dsp like the pixart camera I will post it here in this thread, so that if anyone is interested in the future they have a reference.

Thanks

Bobster23

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