title: When to use accelerometer or gyroscope on Android
body: <p>Is it ok to assume most of the user devices will have a gyroscope? In other words will I be excluding a significant number of people by using a gyroscope in my app?</p>
  
  <p>I'm making a children's storybook app and I'm wanting the user to be able to tilt their device around the yaw axis to move a rocking chair back and forth. It's a small part of the app and it doesn't have to be very precise. Is there one sensor I should use over the other?</p>