How iPhone 3G S Compass Works

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How iPhone 3G S Compass Works - Presentation Transcript

  1. How the Apple iPhone 3G S Magnetometer Works.
    By Dr. ArsenyLebedev B.S. Ph.D
  2. Compasses are attracted to the Earth’s poles using Magnets
    Source: Everyone knows that.
  3. The iPhone 3G S does not use magnets.
  4. Magnetic interference would render the iPhone’s cellular capabilities useless.
    Sources:
    • http://link.aip.org/link/abstract/VIRT01/v19/i22/p112/s1
    • http://weeksmd.com/?p=1521
    • http://blogs.crikey.com.au/planetalking/2009/03/06/electromagnetic-interference-back-in-frame-as-possible-cause-of-qantas-a330-incidents/
    • http://machinegunkeyboard.com/?p=254
    • http://www.macnn.com/blogs/2009/06/11/apples-iphone-emergency-mode-processor-features-patent.html
  5. Spectrograph Analysis
    Once introduced, magnetic interference drops signal strength parabolically. Frequency and power ranges are consistent with GSM bands.
  6. Electronic Solution
    Apple must be utilizing simple RF to determine North.
  7. Hardware Details
    The AK8973 chip on the iPhone is a small sensor that “listens” for an ultra low frequency signal.
    If that signal comes from a specific spot like North, paired with the accelerometer the device can calculate its orientation and direction.
    Sources:
    • http://www.appleinsider.com/articles/09/06/24/cost_to_build_apples_new_iphone_3g_s_estimated_at_179.html
    • John W. Jewett, Raymond A. Serway,Physics for Scientists and Engineers with Modern Physics, pp 532-545, Brooks/Cole, 2007
     
  8. Possible Flaw: How does Apple transmit an RF signal around the world?
  9. Obvious Answer
    Apple has built a Dharma station on the North Pole to transmit a signal!
  10. Contact
    arseny@magnetismstudios.com
    Twitter: @arseny
    Oh, and check out FileMagnet, which really does use magnets:

+ Sal DBSal DB, 5 months ago

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