September 2013
Intermediate to advanced
332 pages
8h 30m
English
Content preview from Building iPhone and iPad Electronic ProjectsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 3. Creating a Metal Detector
The magnetometer in the iPhone is an amazing instrument that gives you the magnetic field strength along three axes in microteslas (µT). Apple software uses this instrument to find the direction in which the iPhone is pointed. This chapter looks at how the magnetometer works, shows you how to access the data from techBASIC, and illustrates using the magnetometer to develop a metal detector.
The iPhone/iPad Magnetometer
If you’re like me, just using a metal detector is not all that much fun. I want to know how it ticks. That’s what the first few parts of this chapter are about. If you don’t care, skip to Using the iPhone or iPad as a Metal Detector, where you’ll find a description of how to use the metal detector app.
Starting with the iPhone 3GS, all iPhones have a built-in magnetometer. All iPads have ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.