1. https://cdn-learn.adafruit.com/downloads/pdf/adxl345-digital-accelerometer.pdf
2. J. Archibald D. Wilde 2016 71 80
3. http://mobileeducationkit.net/nittr-2016.php
4. http://mobilityresearchforum.com/event/build-my_smartphone/
5. http://mysmartphonekit.mobileeducationkit.net/index.php/nitttr/