15
Accessing the Sensors
WHAT YOU WILL LEARN IN THIS CHAPTER
- How to obtain the gyroscope data from your iOS device
- How to obtain accelerometer data from your iOS device
- How to detect shakes to your device
Beginning with iPhone 4, Apple introduced a new gyroscopic sensor in addition to the original accelerometer sensor available since the first iPhone. Using the gyroscope, you can measure the device's angular acceleration around the x, y, and z axes. This enables you to accurately measure the yaw, pitch, and roll of the device. In addition to the gyroscope, the built-in accelerometer measures the linear acceleration of the device along the three axes. With these two sensors, your application can determine how far, how fast, and in which direction it is moving in space.
In this chapter, you learn how to access the gyroscope and accelerometer data and use the Shake API to detect shakes to your iPhone.
FIGURE 15-1
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