Here is a real world example of how to use an accelerometer to monitor the speed of your car: http://forums.vwvortex.com/zerothread?id=3362586  This guy actually uses the accelerometer embedded in the Wiimote.

-RobB
On 7/27/07, Christopher Gilbert <motoma@gmail.com> wrote:
These problems are all solvable with a little bit of calculus.

Provided that your accelerometer will read negative with you slow down, keeping a log of accelerometer readings should be enough.

Let's say you have a graph of your accelerometer readings. The area under the curve (between it rather, because it will drop negative as well) will be your difference in speed between any two intervals. By starting at a known speed, you can then accurately (as far as numbers are concerned) form a graph of your speed. Taking a look at this second graph, the area under the curve will be the total distance traveled.

2007/7/26, Albert Dahan <albert@dahan.nl>:
Hi Dave,

Thanks for making that clear.

Any idea how I can read the distance if the GPS isn't available?

I need to determine the kilometers made by a car without using a
pulse or can solution, is that possible?

Regards,
Albert

On Jul 27, 2007, at 1:28 AM, Dave Hylands wrote:

> Hi Albert,
>
>> Is it also possible to calculate the m/s from a car with the
>> accelerometer,
>> if the GPS is not available?
>
> You can integrate to get speed (I think). But if you're moving along
> at a constant speed, the accelerometer will just read 0, regardless of
> what speed you're moving with.
>
> --
> Dave Hylands
> http://www.DaveHylands.com/
>
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Christopher Gilbert
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University of Maine 2006
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