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Re: Holonomic + gyro/PID
Kris noted the simplest use of a yaw rate sensor and it's easiest implementation: driving straight. We have used this technique on most of our 'bots, holonomic, treaded & wheeled, since 2004. The algorithm is a simple multiplier on the yaw rate detected. We usually determine it empirically, This is added to the motor outputs to create an automatic, opposite spin to the measured yaw rate. When driving straight, the yaw rate is close to zero, so the effect is nil...easy and powerful. Add in a small deadband around zero yaw rate, if it wants to twitch when still. This also helps, if someone is trying push on a corner of your 'bot. Typically we give the driver a button or switch, to turn the effect on and off. We always want the driver to have the final decision on handling.
We've used the gyro for field-centric control, as well. Our results are mixed - a great implementation with our 2004 holonomic 'bot, and a rather disastrous implementation with our swerve drive, last year. Give yourself a lot of time for driver training and robot testing.
Eric
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