how to connect Fitbit accelerometer to matlab

2013 12 22
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更新时间：2014 10 27
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Hi to all, i'am trying to get data from a tri axial accelerometer using MATLAB.
My problem is that i don't know how connect my Fitbit accelerometer to matlab, please suggest me which function should i use to obtain data from accelerometer.
thanks in advance

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Mahdi
Mahdi 2014-10-14
Hi inti, Did you manage to connect your Fitbit accelerometer to Matlab. I tried many ways but unsuccessful. Could you please advise how you have done it.
MeEngr
MeEngr 2014-10-27
Hey, has either of you figured out how to do it yet? I contacted the Fitbit company and they say raw accelerometer data is not accessible to anyone.

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Walter Roberson
Walter Roberson 2013-12-22

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For the moment you could write an interface to libfitbit, perhaps using loadlib()
The formal FitBit API description is at https://wiki.fitbit.com/display/API/Fitbit+API
I do not see anything in the File Exchange designed to talk to FitBit devices.

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inti
inti 2013-12-24
Thanks for your quick reply.
by the way, i'm a newbie to Matlab.
in Fact, On a Windows 7 system, I plugged the device into the usb port after i installed the driver for it. it's neccessary to create an interface to libfitbit? Is-exist an command which allows me to plot the output data from my Fitbit accelerometer.
thanks in advance
Walter Roberson
Walter Roberson 2013-12-24
The FitBit devices use a protocol that looks similar to HTTP. It is not as easy as just using fopen() on the device and having the device automatically start sending the data: you have to send a proper sequence of commands to it and get back responses. libfitbit knows how to do that already, but it is a C-compatible library rather than something that is already ready to call easily from MATLAB.
As you are on MS Windows there is the possibility that the driver you installed has an ActiveX control that could be called to get the data.
Did you have a look at http://www.fitbit.com/setup ? If the data files are on your system already, the effort is reduced.
inti
inti 2013-12-25
编辑：inti 2013-12-25
Thanks for your answer.
My Fitbit device (Fitbit Ultra) uses an ANT protocol, protocol like bluetooth. by doing a search in net, i saw that Libfitbit is supported just by Linux platform and not in Windows (https://github.com/openyou/libfitbit), in this case i don't know if i should using Linux pltaform and installing matlab there or how?
Question: Did you have a look at http://www.fitbit.com/setup ? If the data files are on your system already, the effort is reduced.
Response; by the way, I have a track that allows me to obtain monitoring data in spreadsheet( by using google drive) but the problem thaat somes parameters don't figures like : altimeter, speed...to this reason,i like showin all the output data in matlab to analyze it.
Walter Roberson
Walter Roberson 2013-12-25
If the following page is correct: https://lwn.net/Articles/532410/ then your only option would appear to be to use https://github.com/paulburton/fitbitd . That might possibly only be for Linux.
It appears that at present users are not intended to have fine-grained access to the data, even though there are many reasons why it would make sense to allow that access.
inti
inti 2013-12-25
编辑：Walter Roberson 2013-12-25
Thanks for your response.
i found this script which collect and plot data from an instrument in real time at matlab ( http://www.mathworks.fr/matlabcentral/fileexchange/25519-collect-and-plot-data-from-an-instrument-in-real-time )? i think that it should just update it to work with Fitbit. what do you think about that?
thanks in advance
Walter Roberson
Walter Roberson 2013-12-25
The protocol is not documented, so you would have to figure it out by reading the fitbitd source. The source you found was for a device that has a quite simple protocol.

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MeEngr
MeEngr 2014-10-27

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I don't think there's any way for you to do that. I've been in touch with the Fitbit company and they say raw accelerometer data is not accessible to anyone. There's just no way to access it. All you have is the result of the Fitbit software's processing of the accelerometer data: number of steps, stairs climbed etc.

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