Tare

[embeddedmasters]

Hello,

  We have already used the Freescale Sensor Fusion library on a couple of projects.  We now have a need to be able to 'tare' our device after it has been positioned on a person, goggles.  When I say tare I mean re-arrange the axes so that they are at (0,0,0) after they have been placed on the subject or Zero Frame of Reference.  I have read about the 'frame of reference' capabilities in the V5.0 Fusion Library but I am not convinced these are what is needed.  Do you have any suggestions as to the easiest/best method for doing this...see more detailed explanation below...ignore the VN-100 aspect.  I would think this is a pretty common functionality that is needed...

Secondarily there are a couple of references Noted in Section 3.4 of the Fusion Library document that I am unable to access, it says I "don't have perrmission" ?

http://blogs.freescale.com/iot/2012/10/orientation-representations-part-1/

and

http://blogs.freescale.com/sensors/2013/01/orientation-representations-part-2/

Regards,

Frank

[michaelestanley]

Frank,

I need to do a bit more research before I can respond to the "Tare" feature request.  I agree, it is not equivalent to the FoR features in the kit.  But I suspect it is doable.  Probably as a bit of quaternion math sitting on top of the current library.  Do you have any more complete reference you can point me to?

As to the two links, yeah, we've had problems with Freescale blogs making it across successfully to the new NXP.  I'm still trying to work that issue.  In the meantime, I dumped both to PDF and will post in a separate entry in a few moments.

Regards,

Mike