Designing the Ultimate IMU

Have a good idea for a new product for SFE or Olimex? Let us know!

Moderator: phalanx

Inopia
Posts: 22
Joined: Thu Jul 22, 2010 3:03 pm

Re: Designing the Ultimate IMU

Post by Inopia » Sun Oct 17, 2010 9:23 am

Now that a fully digital imu can be done with just two chips (imu3000/itg3200 + accelerometer), why would I want to have that on a separate board and pay for all the manufacturing overhead/costs that incurs? Why would I want to worry about two separate MCUs?

Daniel Wee
Posts: 33
Joined: Wed May 16, 2007 6:29 am

Re: Designing the Ultimate IMU

Post by Daniel Wee » Sun Nov 28, 2010 7:06 am

I agree - BMA180, ITG3200 or better. A good MCU.

Additionally:-
1. Runs on 3.3V (so that it can be integrated into various products without needing a separate 5V supply)
2. Small footprint (it needs to fit into various devices. All the current ones are too impractical and large.)
3. Forget bluetooth - wired I2C, SPI and UART options
4. did I say small? low pin count (maybe 4 or 5 pins header)

Something like the CHR6D:-
Image

Daniel

wsc
Posts: 53
Joined: Sat Apr 01, 2006 8:51 pm

Re: Designing the Ultimate IMU

Post by wsc » Sun Jan 02, 2011 11:19 am

I kept meaning to post a response now that the Ultimate IMU has been released... and I hate to be negative here, but the product is very lacking IMHO.

First is the issue of the price. Sparkfun has painted themselves into a corner on the price, because the Razor IMU costs only $125 and has very similar hardware capabilities. So anyone looking at IMUs is going to compare the $200 price of the Ultimate to the much lower price of the Razor and wonder, WTF?

The next thing that bugged me was the product page for the Ultimate was almost entirely devoid of any helpful information. Please take the time to create a datasheet, user manual, etc etc for a product of this cost and complexity.

Lastly... the firmware. I poked through the firmware and did not see any Kalman filtering or anything else of significant value going on.

My personal decision at this time would be to pick up a CHR-6dm simply because it has the important feature (Kalman filter) while the Ultimate only has some nice convenience features (USB connector, SD slot, XBee connector) ... Of course that could be rectified with updated firmware.

Rant over, we now return to your normally scheduled programming :|

nturpin77
Posts: 14
Joined: Thu Dec 16, 2010 5:40 am

Re: Designing the Ultimate IMU

Post by nturpin77 » Thu Jan 13, 2011 7:03 am

Has anyone found any source for mounts for this unit? Ive been having a big problem finding anything small enough for the holes.

Thanks

coolharsh
Posts: 5
Joined: Wed May 06, 2009 1:05 pm

Re: Designing the Ultimate IMU

Post by coolharsh » Wed Jan 26, 2011 10:41 am

Invensense has recently released a 6 axis single chip solution.. I think if you guys could contact them and design boards using these chips, you'd have a HUUGE advantage over any other group out there.. single chip IMU solution.. think about it.. :)
http://invensense.com/mems/gyro/mpu6000.html

Coretex
Posts: 1
Joined: Thu Dec 15, 2011 12:19 pm

Re: Designing the Ultimate IMU

Post by Coretex » Thu Dec 15, 2011 12:27 pm

I allready developed the ultimate IMU with redudant sensors and extended kalmanfilter+signal shaping processes and Bluetooth. STM32f103

Image
Image


And I'm now working on a IMU-300 version with STM32F407 and two Invensense MPU6050+HMC+Epson Barometer (10cm resolution). Another version will have accelerometers from Kolibris and VTI for slow motions.

i want to make the new project (imu300) open source, with all my algorithms and a cool abstraction layer for STM32 beginners.

Thanks!

Harinath
Posts: 5
Joined: Mon Apr 09, 2012 7:36 pm
Location: Seoul
Contact:

Re: Designing the Ultimate IMU

Post by Harinath » Mon Apr 09, 2012 8:48 pm

STM32F103 is good to work on. Sony Move controller also work use this one. I'm also interested in STM32F103 platform for designing AHRS with USB & Bluetooth communication.
Would you please leave a message at http://harinadha.wordpress.com . So that we can communicate to work on STM32 open source project.

Thank you.

mcguyver32927
Posts: 2
Joined: Wed Apr 11, 2012 10:44 am

Re: Designing the Ultimate IMU

Post by mcguyver32927 » Sat Apr 14, 2012 4:07 pm

I own this IMU, See what it has to offer. Price tag was $99 each small quantity.. http://tech.yostengineering.com/3-space ... y/embedded

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