Small IMU comparison - RC Groups
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Dec 15, 2011, 12:35 AM
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Small IMU comparison


Hi

We've been planning to create our own IMU so I listed 10 of the existing somewhat quadrotor related IMUs with their sensors and datasheets here:

http://snowcap.fi/blog/2011/12/14/so...s-and-sensors/

I would be very interested to hear feed back about good sensors or other design issues with an IMU.

Thanks.
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Dec 15, 2011, 01:04 AM
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Well, if you wanna get really technical as long as you cater the 5V crowd with arduino, the answer it "it doesn't matter". None of the current arduino code is anywhere near the quality or completeness to where a sensor choice would actually make much of a difference. Also as you noticed there are 10 other choices that all do same thing, so the chances of market needing 11th (unless you're planning to bring them at cost closer to real, i.e. < $25) are also fairly low.
Dec 15, 2011, 02:18 AM
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Actually we'll be using STM32 F2/F4 (Cortex-M3/M4) microcontrollers and 3.3V logic levels. The supply voltage will be 5V.

To my understanding the ST's iNEMO v2 has now open source AHRS code but I don't know anything about the quality of it.
Dec 15, 2011, 03:43 AM
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Quote:
Originally Posted by kulve
Hi

We've been planning to create our own IMU so I listed 10 of the existing somewhat quadrotor related IMUs with their sensors and datasheets here:

http://snowcap.fi/blog/2011/12/14/so...s-and-sensors/

I would be very interested to hear feed back about good sensors or other design issues with an IMU.

Thanks.
Nice idea

One interesting IMU that you missed is Pololu MiniIMU9
The ST gyros have a small sensitivity to vibration, but not as bad as LPR530
Dec 15, 2011, 04:37 AM
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I added the Polulu IMU to the list, thanks.
Dec 15, 2011, 04:42 AM
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While we're on the subject, most of those things linked are simply sensor breakout boards. Calling them "IMU" is a bit of a stretch.
Dec 15, 2011, 04:57 AM
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Quote:
Originally Posted by timecop
Calling them "IMU" is a bit of a stretch.
That's true. Something like "IMU sensor board/shield" might be closer to the exact meaning. In our case the sensor fusion calculation will be done on the main control board, so the combination of the control board and the IMU sensor board would be the IMU.
Jan 04, 2012, 05:35 AM
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Sensor comparison


I've continued to compare the sensors and wrote a short blog post about those:

http://snowcap.fi/blog/2012/01/04/im...or-comparison/
Jan 04, 2012, 05:40 AM
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Quote:
Originally Posted by kulve
I've continued to compare the sensors and wrote a short blog post about those:

http://snowcap.fi/blog/2012/01/04/im...or-comparison/
Quote:
The LSM303 from STMicroelectronics is an exception which makes me wonder if Iíve read the datasheet correctly.
LSM303 is just a multi-die package, HMC5883 and accelerometer in one package. Infact even addressing is same, and reading 'ID' registers will return H, 4, 3 as it does on 5883L.
Jan 04, 2012, 05:50 AM
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Quote:
Originally Posted by timecop
LSM303 is just a multi-die package, HMC5883 and accelerometer in one package. Infact even addressing is same, and reading 'ID' registers will return H, 4, 3 as it does on 5883L.
Right, so there's no point in using LSM303 as the accelerometer wouldn't be needed from it anyway.

I guess that means that I can't read magnetometer values from LSM303 more often than I could read from HMC5883L (i.e. max 160Hz)?
Jan 04, 2012, 06:23 AM
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Correct.


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