Hi, my name is Zach, and I started this blog because I was unhappy with activity trackers on the market circa Q3 2013.  Existing products make accessing raw data impossible, both by quantizing it into discrete units ( steps, points, etc.) and by blocking access to time series information. As a biomedical engineer, I wanted to analyze sensor data to find interesting signals which the designers of consumer products might have ignored in the name of simplicity. This blog will document my attempt to create algorithms which do this, and give the extracted data context through correlation with external events. I’ll probably make some errors, so if you see something wrong with any of my posts, please let me know!


8 thoughts on “About

  1. intissar says:

    that’s great! a very nice work. in other hand, i have a question:
    its possible to obtain a acceleration data (X,Y,Z) from Fitbit Ultra as output ?

    thanks in advance

    • I haven’t played around with the FitBit Ultra, but I don’t believe so. I paid FitBit $50 for access to the deepest data they would provide for my Felx, but there was nothing more granular than steps per day.

      • intissar says:

        Thanks for your reply. I have too the FitBit Flex ,so i can use it.

        As we know that FitBit use an algorithm to convert the output acceleration data to number of steps, calories bruned….

        My goal is how can i extract the acceleration data 3 axis? is these possible with matlab? if yes, please, how can i connect my fitbit flex to matlab?

        Thanks in advance.

        Best Regards,

  2. KJ says:

    Activity hacker! I feel your frustration with the current crop of activity trackers. Can you share details (make , model) on the data logger that you are using?

  3. Scott says:

    Activity hacker, have u used matlab to play around with a fitbit user’s data? would u be willing to share your code?

  4. Erik says:

    Hi Zach, are you still interested in or working on the Activity Hacker stuff? I see your last post is from over a year ago. We are working on a real open source health & activity tracker, meaning it is actually open hardware, open source software and open design, contrary to the alternative ‘open’ wearables out there. We produced the first 100 devices and would be happy to lend you one, in case you are interested in working together with our community.

  5. Christine Fieser says:

    I came across your blog while searching for how to export my fitbit data.
    I have been tracking steps, weight from 2012 and food intake since summer of 2013 (myfitnesspal).
    I became extremely active from the end of 2013 until present. I have had Vo2, RMR, DEXA done for tracking purposes. Also purchased a breezing metabolism tracker.
    In the last year I have struggled with my weight going up a few pounds and I have theories.
    I have an incredible amount of data and I want to analyze trends and see if I can see my theories (also perhaps find the sweet spot of calories in, daily activity and weight maintenance. Any advice/suggestions?

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