## Re: [Gumstix-users] use of an accelerometer.

 Re: [Gumstix-users] use of an accelerometer. From: Sean Reilly - 2007-08-01 12:13:35 ```has anyone actually implemented this ? I think that this only works for very small amounts of time (seconds max) as the error from the accelerometer quickly becomes too big, its also why its very hard to determine distance from accelerometers (the double integral) Sean Christopher Gilbert 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 >: > > 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 > > Vancouver, BC, Canada > > http://www.DaveHylands.com/ > > > > > ---------------------------------------------------------------------- > > > --- > > This SF.net email is sponsored by: Splunk Inc. > > Still grepping through log files to find problems? Stop. > > Now Search log events and configuration files using AJAX and a > > browser. > > Download your FREE copy of Splunk now >> http://get.splunk.com/ > > _______________________________________________ > > gumstix-users mailing list > > gumstix-users@... > > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a > browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > gumstix-users mailing list > gumstix-users@... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > -- > Christopher Gilbert > B.S., Computer Science > University of Maine 2006 > http://motomastyle.com > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > ------------------------------------------------------------------------ > > _______________________________________________ > gumstix-users mailing list > gumstix-users@... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > ```