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For the same price chip, which will be more accurate to measure rotational acceleration: a gyroscope, or an accelerometer 10cm away from the pivot point?

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  • \$\begingroup\$ Do you want to integrate the rotational acceleration to compute the orientation, or just keep it as is? \$\endgroup\$ – Vladimir Cravero Jun 15 '14 at 17:02
  • \$\begingroup\$ @VladimirCravero Keep it as is. I would differentiate the orientation to get the rotational acceleration. \$\endgroup\$ – Dan Jun 15 '14 at 17:53
  • \$\begingroup\$ a gyroscope would give you an output in \$\frac{\text{rad}}{s}\$, you can differentiate it to get \$\frac{\text{rad}}{s^2}\$, is that right? \$\endgroup\$ – Vladimir Cravero Jun 15 '14 at 20:00
  • \$\begingroup\$ @VladimirCravero Correct. \$\endgroup\$ – Dan Jun 15 '14 at 23:44
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Gyroscope will be more accurate, but is highly subjet to drift, which is the reason why they are often used with an accelerometer and even sometimes with a compass.

Accelerometer alone will be slow.

I would suggest you watch this conference : http://www.youtube.com/watch?v=C7JQ7Rpwn2k

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  • \$\begingroup\$ So, the impression I'm getting is to use both and combine the data, is that correct? \$\endgroup\$ – Dan Jun 15 '14 at 19:17
  • \$\begingroup\$ Yes, I think it's the best thing to do. Nowadays, you can find ship including compass, accelerometer and gyroscope for a price comparable to a gyroscope alone. \$\endgroup\$ – servabat Jun 15 '14 at 20:52

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