Mecanum Holonomic Drive Setup

[Arkamond]

Originally Posted by Alan Anderson

If weight is reasonably balanced and drivetrain friction is well managed, it's perfectly reasonable to control a mecanum drivebase without any sort of sensor feedback on the robot. If I were building one right now, I'd add a gyro before any other sensors. That would let me use closed-loop control on direction at a high level, and not worry about commanding and maintaining specific motor speeds.

But where is this gyro positioned? What type of gyro is used?