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Unread 07-02-2017, 13:20
JamesBrown JamesBrown is offline
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Re: Recommended gyros that can keep up with fast rotation?

Quote:
Originally Posted by trycatch View Post
Really though, even if we slow it down to cap at 300 degrees / second, there's the possibility of getting pushed around a bit by someone playing defense or something and losing track of where you're facing that way. I'd like the drivers to be able to turn quickly in teleop, but still have quick and easy "go to this angle" buttons for quick alignment.
The issue here isn't going to be the rate then. The issue of drift over the course of a match can't just be overcome with a "better" gyro. You are always going to have noise in a gyro system. A gyro is very good at measuring rotational acceleration, however things like vibrations, linear accelerations, and electrical noise can be read from the sensor as rotational acceleration, causing drift.

An IMU will help with this issue, it will take inputs from other sensors (accelerometers, other gyros, magnetometer) on the same chip, and use them to filter the gyro signal to help minimize the drift. The NAV-X, Pigeon IMU, and ADIS16448 are all used by FRC teams successfully, and are pretty well documented. I think you will have a lot more luck with one of these IMUs than you would trying to find a better quality gyro. Even with an IMU there will be some drift over the course of a match. Inertial sensors in general do much better at tracking short term relative movements than they do at tracking position or orientation over a period of time.
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