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Step 1 — iPhone 4 Gyroscope Teardown

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  Before we get into the nitty gritty of things, let's understand what a gyroscope actually does.
  
  
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  According to 訪客無法瀏覽此圖片或連結，請先 註冊 或 登入會員 。, "A gyroscope is a device for measuring or maintaining orientation, based on the principles of conservation of angular momentum." The key phrase is measuring or maintaining orientation, which is the exact reason an iPhone 4 contains one of these gizmos.
  
  
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  A mechanical gyroscope - like the one shown on the left - uses a spinning rotor in the center to detect changes in orientation.
  
  
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  The iPhone 4 utilizes a microscopic, electronic version of a 訪客無法瀏覽此圖片或連結，請先 註冊 或 登入會員 。 gyroscope, called a 訪客無法瀏覽此圖片或連結，請先 註冊 或 登入會員 。.
  
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