I would check out Robotics articles. 
This is a common thing to do in automation.

You should know (and you will if you do any research) that converting to 
real-world coordinates will be less than accurate and the error will 
increase the more you do it without some sort of way to correct those 
errors.
For example, you can get an accelerator value of X, but you don't have any 
real way to know exactly how far you have travelled in real-space. You can 
make an educated guess and it will work for normal situations but only for a 
few readings. You then need some way to correct for any introduced errors or 
the errors will simply grow no matter how smart your code is.

Here, try this:
http://tinyurl.com/6hf9av8

- Brill Pappin

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