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Re: [Paparazzi-devel] Connecting the xsens IMU to the Tiny

From: Gautier Hattenberger
Subject: Re: [Paparazzi-devel] Connecting the xsens IMU to the Tiny
Date: Fri, 12 Dec 2008 16:13:04 +0100
User-agent: Thunderbird (X11/20081125)

If you have a Tiny2, can try to add the flag -DNO_INTERNAL_GPS. It is supposed to set the gps reset to the ground, thus shutting him down. Try it, but I'm not sure it works fine (I've had a problem when this flag was added, but it appears that the problem has nothing to do with this and then I get a Twog and it was useless...).
Right know, the only way to connect the Xsens is the Uart, sorry.


Andreas Gäb a écrit :
Gautier Hattenberger wrote:
There is a driver for the Xsens ins in the airborne code but I don't
think anyone ever used it with a fixed wing airframe (it was designed
for quadrotors). The problem for you is to update the estimator the
value of the ins.
I'll have a look into it. For a start, it will possibly be sufficient to
use the position data from the IMU as GPS replacement and query
accelerations and angular rates seperately for PID only.

Anyway, if you want to try it (using a Twog is the best solution right
now in this case), the Xsens can be configured with something like:

 <section name="XSENS_INS">
   <!-- calibrated, orientation, position, velocity, status -->
   <define name="XSENS_OUTPUT_MODE" value="0x0836"/>
   <!-- timestamp, euler, acc, rate, mag, float, no aux, NED -->
   <define name="XSENS_OUTPUT_SETTINGS" value="0x80000C05"/>

and in the makefile section (for a Twog):

# XSens
ap.srcs += latlong.c gps.c gps_xsens.c ins_xsens.c $(QUAD)/ins_quad.c

So UART is the only way to connect, no chance for the Tiny?

I hope this will help you. Let me know if you have problems with this
It helps me in selecting the hardware to buy :-). I'll let you know, but
most probably not before next year.

By the way, what is the kind sensor you are using for airspeed. Is it a
commercial product or an home made ?
The probe itself must have been built at the institute here, but no
documentation is left, so nobody knows for sure. The attached sensors
are standard SMD pressure sensors.


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