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Re: [Paparazzi-devel] ArduIMU on Wiki

From: Martin Mueller
Subject: Re: [Paparazzi-devel] ArduIMU on Wiki
Date: Wed, 03 Nov 2010 08:04:52 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Thunderbird/3.0.10

Hi Stephen,

you can fly the AXI 2212/26 in the Funjet Ultra (we have flown a Funjet with more than 900g with that engine - no fun to land, though). But the Ultra is designed to fly fast, so better get a bigger motor with more RPMs and a smaller prop. The 9x6 gives thrust but not speed.


On 02.11.2010 23:59, Stephen L Hulme wrote:
Hi Martin

I too have an ArduIMU unit which I will install in a Funjet Ultra. when they 
become available at Tower Hobbies (soon apparently)

I know this is slightly unrelated to this thread, but I noted your funjetmm2 
runs the Ultra airframe.

Did you have to upgrade the motor set from an AXI 2212/26 with a 9x6 prop to 
compensate for the heavier airframe compared to the original funjet?



On Tue, 02 Nov 2010 17:16:04 +0100, Martin Meuller wrote:

Hi David,

with the Arduino debug plug pointing forward in flight and parts up the
directions work ok for me. Maybe it is the earth horizon moving the
other way than the aircraft?


On 02.11.2010 05:07, David Conger wrote:

    Hi Martin,

    With your help I have a Tiny2.11 with an ArduIMU connected to the I2C port. 
    followed the Wiki and am using your airframe suggested with the exception 
    I also commented the ADC IR values and set the modem to transparent.

    Holding the IMU with the arrows on the IMU for X,Y,Z I see pitch in the PFD 
    shown correctly. However the roll is reversed. If this was an airframe with 
    I would change the sign for: LATERAL_CORRECTION in the INFRARED section. As
    expected there is no INFRARED section. I sure could use a LATERAL_CORRECTION
    value to modify though :)

    Is there a way I do not see to reverse the roll? Before doing this I did 
    the firmware in SVN for the arduIMU (as per the Wiki).

    BTW, very cool to see IMU data and the PFD artificial horizon responding to 
    IMU movements. Thank you for all your help so far. I think I am close.

    On Oct 30, 2010, at 11:26 PM, Martin Mueller wrote:

        Hi David,

            Thanks to the new notes I have a compiled airframe
            I would like to try the ArduIMU and followed the steps from the 
Wiki. However
            there was no mention of this value:
                  <subsystem name="attitude"        type="infrared"/>
            ...and the IR_ values farther in..
            Can someone help. If I do  not have IR and am flying with ArduIMU 
what becomes
            of those values? Removing them all brings compile errors. Leaving 
them without
            any IR sensors won't cause issues?
            Would it be possible for someone who is flying with IMU to post 
their airframe
            to SVN or in a reply? vn100 or ArduIMU or even Booz IMU.

        you might try airframes/mm/fixed-wing/fw_ins_arduimu.xml. The infrared 
        be removed at the moment not to have two software parts update the 
        Did you use settings/tuning_ins.xml as mentioned in (4)?


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