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xavier
Joined: 10 Feb 2004 Posts: 7
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Gyro and accelero |
Posted: Mon Sep 17, 2007 4:47 am |
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Hello everybody from France
I'm trying to build a low cost Segway.
I didn't find anything with a pic on the WEB
Gyro and accelero are not cheap but I found something interresting
http://ndsmotion.com/
The DS Motion Card is an tri-axis accelerometer and single-axis gyroscope for 30$ !!!
Does someone have use it ? do you think it could work for my project ?
Any help appreciated
Thanks in advance
Xavier |
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libor
Joined: 14 Dec 2004 Posts: 288 Location: Hungary
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Posted: Mon Sep 17, 2007 9:25 am |
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Quote: | I didn't find anything with a pic on the WEB |
Are you sure, you have googled for 'segway diy PIC' or 'balancing robot Microchip' or some similar combination of these synonyms ? |
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xavier
Joined: 10 Feb 2004 Posts: 7
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Gyro and accelero |
Posted: Wed Sep 19, 2007 2:58 am |
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Thanks Libor,
I was not clear in my first post, and i wanted to know if someone used this DS motion card with a PIC.
The second question was to know if for my project it could work ?
Many thanks for the link via google always interresting to learn from other similar project.
PS : what DIY mean ? (is it do it yourself ?)
Xavier |
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libor
Joined: 14 Dec 2004 Posts: 288 Location: Hungary
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Posted: Wed Sep 19, 2007 3:54 am |
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We are here already a small subset of PIC users, so dividing us further to users of a DS motion card can result a rather small number of people.
I think your project could work. (though a self-balacing robot may not be a project to begin with..) Look for the caveats well collected on this page http://www.tlb.org/scooter.html (under the 'Rolls Royce vs Model T' paragraph) pointing out some (more or less serious) drawbacks of not using hi-tech custom-manufactured parts.
Yes, DIY stands for do it yourself.
After some googling on the web I have learned that Nintendo and so the DS motion card also uses an SPI bus as an interface. There must be many projects on the web utilizing this bus of a Nintendo. So I think, you can find the pinout easily.
I also found that the DS motion card uses a Kionix KXPB5 3-axis axelerometer (this device has SPI bus) you can find this chip's datasheet here or www.kionix.com (look at the application notes also)
so, i think you can gather all the information to write some code to begin with.
You may find more PIC projects, examples with the ADXL-series accelerometers. These (older, so more widespread) ICs have pwm (or rather some pulse-position-coding if i remember right) or an analog inteface. You have an advantage of having a digital data bus with this Kionix chip. So you only have to change (simplify) the interface part of any example using the ADXL series. |
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