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Accelerometer total not equal to 1

by mark2468
Tags: accelerometer, equal
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mark2468
#1
Jun29-10, 10:39 AM
P: 12
Hi.

The theoretical total of accelerometer output when in a static position is equal to 1 g. However I get a different result depending on where the device is positioned. Some is greated than 1, some is less.

What I have done is determine the max value for each axis and divide all readings of a particular axis by the max for that axis. e.g:

Zmax = 1.14 and so all Z values are divided by 1.14.

I have done this for all three axis but the total is still not equal to 1. If there was a slight offset I could live with this, but it is different for all static positions.

Is there a way of getting the totals being the same for all positions in the 3d plane?

Mark.
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K^2
#2
Jun29-10, 01:17 PM
Sci Advisor
P: 2,470
The total shouldn't be one. It's the square root of the sum of the squares that should be 1. Assuming no other accelerations.

And why do you start a new thread for every question with your accelerometer? Can't you keep it all in one thread? I guarantee you'd get better answers that way.
mark2468
#3
Jun29-10, 02:42 PM
P: 12
sorry, am new to forums.

I meant the total being the square root of the sum of the squares. This is not equal to 1, and the difference is not the same at each reading. If it was I could easily remove it.

Is this common and is there a way to correct it.


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