Author Topic: Accelerometer study  (Read 31250 times)

Offline Triniko

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on: January 02, 2009, 07:45:24 AM
Hi everyone,

I'm a french student and in order to take an exam in April, I'm  working on the "TIPE", a kind of very little thesis. I've chosen to study the Wiimote controler and its accelerometer. This study is divided into two part: a theoritical part, and a second part which concentrate on experiments. I'm just 17 and I'm not specialized in programming. That's why I'm trying to look for a simple approach of this study.

I have some acceleration measurement with the software GlovePIE. But it's not enough for the study. I'm planning to make vibratory measurement.

Do you know any websites or links which can give me some information about the Wiimote, or experiment using this controler?

Have you any idea about an experiment?

Thank You.



Offline Wiweeyum

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Reply #1 on: January 02, 2009, 03:37:07 PM


~"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."~
- EF Schumacher


Offline benpaddlejones

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Reply #2 on: January 02, 2009, 04:42:07 PM
Triniko
Sounds like a great project.
Please don't forget to post your findings here when you are done.

To start here are some links to help you with the theory:
The Wikipedia Wiimote: http://en.wikipedia.org/wiki/Wii_Remote a product/marketing/design focus on the Wiimote
Wiimote Wiki: http://www.wiili.org/index.php/Wiimote a good technical guide
Motion Analysis: http://www.wiili.org/index.php/Motion_analysis a great technical and mathematical guide to motion analysis
Best Wiimote Wiki: http://wiibrew.org/wiki/Wiimote this gives teh most accurate and detailed technical analysis of the Wiimote

Hope this starts you on your journey

benpaddlejones :)


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Offline Triniko

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Reply #3 on: January 03, 2009, 03:49:11 AM
Thank you for the links.
I've already read the first link. I' trying to understand the second and third links.
Here is my plan for now on (excuse me, my English is very approximate):

I'd like to make a comparison between information given by Nintendo about the performance of the Wiimote (maximal acceleration, detection speed, detection precision, resonance, frequential response) and the results of experiments.

I don't know where to start. Have you any advice? (about software, theoretical part, experiment)

Triniko




Offline benpaddlejones

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Reply #4 on: January 03, 2009, 05:12:09 AM
Triniko
I'm not a physics teacher but to keep it simple I would consider the following research question:
Results comparison between the Wiimote Allecerometer and Manual Accleration techniques.

The test would be to repeat a test (a small toy car accelerating from Zero over 5m).

The test would be recorded using a wiimote (use the accelerometer application to gather data) & a stopwatch  and manual calculations. Your project is simply to compare the data.

Your physics teacher will provide you with more guidance on the concept and calculations needed but this would be a very fun, easy and valid research project.

benpaddlejones :)


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Offline Triniko

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Reply #5 on: January 03, 2009, 06:17:11 AM
Quote
Manual Accleration techniques.

Is it the datasheet given by analog device? here: http://www.analog.com/static/imported-files/data_sheets/ADXL330.pdf
If it's not, where can I find it?

The toy car is a good idea, but how do we know that the acceleration of the toy is the maximal acceleration?
For the frequential response, a friend said that it would be great if I attach the controler on a vibrating table (with vibrations generated by a little engine). Can I have the frequential response with GlovePIE? or is there another software?

Triniko



Offline ujs

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Reply #6 on: January 03, 2009, 06:18:24 AM
Hi, a couple month ago I've actually written a simple application to record acceleration data from multiple Wiimotes at the same time.
I'm going to put it on my website over the next few days...

Uwe

Java WiimoteWhiteboard for Mac OS X, Windows and Linux.


Offline benpaddlejones

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Reply #7 on: January 03, 2009, 08:17:48 AM
Triniko
Looks like it is but te reverse engineer sites will know more.

UJS program opens doors in comparing the same event from two wiimotes (i.e. objects crashing).

You could do a simple project on the de-acceleration effects of a variety of front protective equipment on a head on collision (two toy cars obviously).

benpaddlejones


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Offline Wiweeyum

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Reply #8 on: January 03, 2009, 11:27:30 AM
That sounds fun... I want a thesis due so I could have an excuse to do that.


~"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."~
- EF Schumacher


Offline ujs

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Reply #9 on: January 04, 2009, 09:57:54 AM
Hi, a couple month ago I've actually written a simple application to record acceleration data from multiple Wiimotes at the same time.
I'm going to put it on my website over the next few days...

It's released now: http://www.uweschmidt.org/wiimote-logger

Uwe

Java WiimoteWhiteboard for Mac OS X, Windows and Linux.


Offline Triniko

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Reply #10 on: February 02, 2009, 02:36:40 PM
Hi everyone,

Do you know a Website which explains how the Wiimote and the accelerometer work? (for a theoritical approach)

Thanks

Triniko



Offline benpaddlejones

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Reply #11 on: February 02, 2009, 03:55:12 PM
Triniko
The reverse engineering site listed above will tell you which part it is. Then you need to find a similar accelerometer to get the information on how it works. All the Wiimote does is transmit the data from the acclerometer via bluetooth.

benpaddlejones :)


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Offline Triniko

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Reply #12 on: February 03, 2009, 02:29:18 PM
Hi,

what is the reverse engineer site? (I'm sorry I'm french and I don't know what is a reverse site).

Triniko.



Offline benpaddlejones

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Reply #13 on: February 03, 2009, 03:58:39 PM
http://www.wiire.org/Main_Page

sorry i thought I gave it to you in an earlier post.

Reverse engineering is working out how something is made by pulling it apart.

benpaddlejones :)


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Offline Triniko

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Reply #14 on: February 19, 2009, 02:31:31 PM
Hi everyone.

I would like to know something. What is the type of accelerometer inside the Wiimote? (capacitive? piezoelectric? or other?...) Because I have read many topics on the web and it's very contradictory.

Thanks.