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I am planning a project that will measure and log the tilt of my push bike while I am riding it. The fastest that I would be recording is every 0.1 seconds, though it will probably be every 1 second. I am planning on using an Arduino as the platform.

From my research, I am currently unsure whether I just need a magnetometer (2 axis?) or whether I need to add a gyroscope and accelerometer as well?

As I am not located very near either of the earth's poles (i.e., mainland Australia) and am not thinking on going particularly far, so calibration at the start may allow accurate measurements using a magnetometer. However, I am not sure that it can be used like that.

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Considering that even top spec Android phones and iPhones run magnetometers, gyros and accelerometers and still aren't that accurate, I would definitely recommend all.

Gyroscopes will give you the fastest response to tilting. Accelerometers will give you the fastest response to a linear movement.

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  • \$\begingroup\$ I thought most high end phones have one acceleration or gyroscope and a compass unit. I did not think they carried multiple. If you have a nice gyroscope and a nice accelerometer you can tell your location, but both are needed and rarely included. \$\endgroup\$
    – Kortuk
    Sep 20, 2011 at 8:27
  • \$\begingroup\$ iPhone has gyros, accelerometers and magnetometer. I think the top end htc phones have gyros too \$\endgroup\$
    – Rory Alsop
    Sep 20, 2011 at 8:37
  • \$\begingroup\$ tested.com/news/… \$\endgroup\$
    – Rory Alsop
    Sep 20, 2011 at 8:37
  • \$\begingroup\$ Interesting. I did not realize how decked out the phones are. \$\endgroup\$
    – Kortuk
    Sep 20, 2011 at 8:43

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