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J---
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Very cool
J---   8/19/2013 1:49:46 PM
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I just wished the maximum rotation speed was quite a bit faster. 450 degrees a second may sound like a not, but even for personal navigation that could be too slow. It will depend on whether thats instantaneous of average. A person walking and turning around can do 180 degrees in less than 1/2 a second and peaks much higher. Same even for a car doing a U-Turn.

R_Colin_Johnson
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Re: Very cool
R_Colin_Johnson   8/19/2013 2:00:02 PM
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I see your point--yes it could be faster--but I think their emphasis was on stability over speed.

Susan Rambo
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Re: Very cool
Susan Rambo   8/20/2013 3:58:24 AM
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Interesting. What would the best uses for the Chicklet-sized IMU be if it's not fast enough?

bausin6
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Not so cool
bausin6   8/20/2013 1:37:25 PM
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With a range of 450 deg/sec and 16-bit output, an LSB is 50 deg/hr. And where are the specs for noise, bandwidth, performance over temperature, etc.?

R_Colin_Johnson
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Re: Not so cool
R_Colin_Johnson   8/20/2013 1:58:23 PM
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Epson has most of the V340s specs listed here:

http://www5.epsondevice.com/en/sensing_system/product/imu/v340/

And if you click on "M-V340 Briefsheet" near bottom of page you can get a datasheet.

bausin6
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Re: Not so cool
bausin6   8/20/2013 2:42:02 PM
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>> For that range each count is not 50 degree per hour.

 

Really? So tell me what one count represents?

bausin6
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Re: Not so cool
bausin6   8/20/2013 2:51:06 PM
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>>  ...but the bottom line here is that it can sense faster angular rates than the Max min range.

The bottom line here is that they claim 7 deg/hr bias but an LSB is 50 deg/hr.

 

Stranded
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Re: Not so cool
Stranded   8/20/2013 3:25:52 PM
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As far as one count is the minimun level the internal ADC can detect (typically the output is in 2's complement).  For example for a 16 bit 2's complement part you can have each count as 0.015 deg/sec.

7FFF

.

0001

0000

FFFF

.

8000

 

The bottom line is that original statement was incorrect:

 

180 degrees in less than 1/2 a second is actually 360 per second so this gyro can detect that.

 

and also that Q-MEMS seems like a superior approach compared to plain silicon MEMS vanilla, also I heard they are trying to do a 2x2 mm gyro based on Q-MEMS and that is the bottom line here

 

 

Scott Elder
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Re: Not so cool
Scott Elder   8/21/2013 12:26:52 PM
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Can anyone comment on the price? 



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