Re: [Paparazzi-devel] ArduIMU+ V3??

[Stephen Dwyer]

Hi Anish,

I was thinking performance in terms of speed, features, sensor
quality, output quality etc. I don't know all that much about AHRS
systems, but the ArduIMU is rather slow (50Hz), and the atmega's speed
and memory size really limits possibilities (I worked with a v2 for a
bit and found the flash and ram got filled up pretty fast adding
additional features). Most other IMUs/AHRSs/INSs have high update
rates. I could think of some examples like the Ryan Mechatronics
CHIMU, VectorNav VN-100, MicroStrain units, etc. I believe the
aspirin/other sensor support right on paparazzi will give better
performance.

Of course, you could argue for a long time about what is best :).

-Stephen Dwyer

On Tue, Apr 17, 2012 at 2:00 PM, Anish <address@hidden> wrote:
> Out of curiosity which one's would u consider as high performance
> AHRS units :)
> Sent from my BlackBerry® wireless device
>
> -----Original Message-----
> From: Stephen Dwyer <address@hidden>
> Sender: address@hidden: Tue, 17 Apr 2012 10:56:54
> To: <address@hidden>
> Reply-To: address@hidden
> Subject: Re: [Paparazzi-devel] ArduIMU+ V3??
>
> Hello,
>
> You will definitely have to do some code modifications to the ArduIMU
> code and possibly the paparazzi code to be able to use ArduIMU v3. In
> v2 the i2c port was unused, and thus made into an i2c slave on the
> arduimu, so paparazzi could request measurements as desired.
>
> In v3, the magnetometer is attached to the atmega i2c port, which is
> probably configured as a master. So, you will have change the
> interface method to paparazzi, or not use the mag in the arduimu code
> and reconfigure to use i2c as a slave on the atmega, then possibly
> also use the twog to sample the mag if you would like these readings.
>
> It is probably achievable without too much effort if you look at the
> sample modified firmware for v2 in
> sw/airborne/firmwares/non_ap/arduimu_Firmware_WithGps/.
>
> Another option might be to purchase the v2 from Sparkfun, they seem to
> have some left in stock.
>
> Keep in mind the ArduIMUs are certainly not the most high performance
> AHRS units, compared to other options.
>
> Hope that helps.
>
> Thanks,
> -Stephen Dwyer
>
> On Tue, Apr 17, 2012 at 3:12 AM, iman shirdareh
> <address@hidden> wrote:
>> Hi
>>
>> I want to buy IMU from diydrones but they doesn't have ArduIMU V2 , they
>> have ArduIMU V3 .
>>
>> Now may I to use ArduIMU V3 with my Paparazzi TWOG autopilot?
>>
>>
>>
>> Thanks a lot..................Iman
>>
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