Piezeo gyroscope

[Mark McLeod]

That style is designed for maintaining a heading in an rc vehicle, like a helicopter, by modifying the input PWM according to the gyro and a P-type gain to produce an output PWM signal that counters vehicle drift. It's used basically to counter known & fixed vehicle bias, because the gain is set manually and cannot be adjusted on the fly.

It's not directly usable on an FRC-rules robot, because it modifies the motor control signal.

[mman1506]

MEMS gyros (what is commonly used) are generally superior to piezo gyros in cost, size and performance. Up until a couple of years ago MEM gyros where prohibitively expensive so you still see some piezo gyro is old rc heli equipment.