Maximum value for accelerometer reading

Question

Maximum value for accelerometer reading

Hello All,

Does anyone know the maximum accelerometer reading the iPhone is capable of. I made a simple app to test this and it seems like I can't get anything higher than 2.307 on the x-axis no matter how fast I swing it. I didn't see anything like this in UIAccelerometer docs. Does anyone know anything regarding this? Thanks.

Mac OS X (10.5.5)

Posted on Oct 7, 2008 8:53 AM

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Answer 1

Oct 7, 2008 9:25 AM in response to digitalmotion

I looked at the manufacturer page of the accelerometer the iPhone employ's and it looks like it capable of detecting several thousand G...anyone know why it is capping my output at slightly more than 2G? Thanks.

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Answer 2

Oct 7, 2008 10:17 AM in response to digitalmotion

I think I've gotten over 3 on the Y axis. That's quite a lot if you think about it. 3x the force of gravity (32 ft/s^2, 9.8 m/s^2). Can you really move your arm at rates faster than 100 feet per second squared?

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Answer 3

Oct 7, 2008 10:24 AM in response to SexyAndOhSoWitty

Well...i AM a martial arts master 😉

But seriously, I can achieve the maximum value of 2.307413 (approx) with an average lob of my arm, by no means fast.

I found out that this might be a software restriction put in place to ensure a range that the accelerometer is accurate over...but I would like to have the option of expanding that if possible.

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Answer 4

Oct 7, 2008 10:27 AM in response to digitalmotion

If that's the case, it is probably too low-level to access using the SDK.

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Answer 5

Oct 7, 2008 10:30 AM in response to SexyAndOhSoWitty

Yeah, I think I'll have to put in an enhancement request to apple and see if that bears any fruit. In the meantime can you let me know if you (or anyone else out there) ever see a value coming from acceleration.x y or z that is greater than that value I specified? There's a chance my code is just weird but I all I am doing is just displaying the values as they come in so I don't think I've done anything wrong. Thanks.

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Answer 6

Oct 7, 2008 6:46 PM in response to digitalmotion

I asked an Apple engineer at WWDC, and he said the readings where limited to +/- 2G in each axis.

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Answer 7

Oct 10, 2008 6:02 AM in response to digitalmotion

Hello,
Can you indicate me who is the manifacturer of iPhone accelerometer?

I'm looking for some info on a accelerometer like this: even roughm nothing top secret. 🙂
I'm making a study analysis of hardware in console e smartphone. I'm trying to understand more or less how much a accelerometer costs to an enterprise, considering that I'll need several thousand of them.

Any help is well accepted, thanks!

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Answer 8

xnav

Level 5

7,089 points

Oct 10, 2008 8:29 AM in response to FeDe[WeT]

I read somewhere that [this is the manufacturer|http://www.st.com/stonline/products/families/sensors/accelerometer s.htm].

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