Gyroscope.rotationRate
var rotationRate: Vector3;
Vector3 rotationRate;
rotationRate as Vector3
Description

Returns rotation rate as measured by the device's gyroscope.

The rotation rate is given as a Vector3 representing the speed of rotation around each of the three axes in radians per second. This is the value as it is reported by the gyroscope hardware - a more accurate measurement that has been processed to remove "bias" can be obtained with the rotationRateUnbiased property.
	var shakeSpeed: float;
	var shakeSound: AudioClip;

	function Update() {
		// Play a sound when the user rotates the device quickly.
		if ((Input.gyro.rotationRate.y > shakeSpeed) && !audio.isPlaying) {
			audio.PlayOneShot(shakeSound);
		}
	}
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public float shakeSpeed;
    public AudioClip shakeSound;
    void Update() {
        if (Input.gyro.rotationRate.y > shakeSpeed && !audio.isPlaying)
            audio.PlayOneShot(shakeSound);
        
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public shakeSpeed as float

	public shakeSound as AudioClip

	def Update() as void:
		if (Input.gyro.rotationRate.y > shakeSpeed) and (not audio.isPlaying):
			audio.PlayOneShot(shakeSound)