This application counts steps based on accelerometer data and calculates travelled distance based on computed stride length [1-2] using the user's demographic information. Inspired by [3] and [4].
When a new accelerometer datapoint becomes available, it is fed into calMag function to calculate magnitude. Then, every one second, if at least 60 magnitude values are accumulated, the process of counting steps starts by calling countSteps. First, the average of the collected magnitudes is calculated and subtracted from each point. Then, the resulting values are compared with a constant value of eight, approximating the standard deviation of magnitude when walking. However, to have a more reliable result, an algorithm is required to detect walking and then calculate the standard deviation of the collected magnitudes over time.
For the app to work correctly, the app should be prevented from suspension by following these steps:
- Open "UT Tweak Tool"
- Go to "Apps + Scopes"
- Click on "Steps"
- Activate "Prevent app suspension"
The app has been tested on Nexus 6P, Pixel 3A, Poco F1, Sony Xperia X and PinePhone.
The device should be in the pocket for the best accuracy.
[1] Chung, S. Long Walk Shirley Chung AT Still University
[2] Barreira, T. V., Rowe, D., & Kang, M. (2010). Parameters of walking and jogging in healthy young adults. International Journal of Exercise Science, 3(1), 4-13
[3] Counting Steps by Capturing Acceleration Data from Your Mobile Device - MATLAB & Simulink. Retrieved March 18, 2022, from https://www.mathworks.com/help/matlabmobile_android/ug/counting-steps-by-capturing-acceleration-data.html.
[4] Clime, C. sensorsstatus. OpenStore. Retrieved March 18, 2022, from https://open-store.io/app/sensorsstatus.chrisclime.
[5] Usage and implementing of the User Metrics (alias Circle Message): https://docs.ubports.com/en/latest/appdev/guides/user-metrics.html
Copyright (C) 2023 Javad Rahimipour Anaraki
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License version 3, as published by the Free Software Foundation.
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