Gyro and accelero

[xavier]

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

[libor]

[xavier]

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

[libor]

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.